013295   Singh C P (Applied Mathematics Dep, Delhi College of Engineering, Bawana Road, Delhi-110 042, Email: cpshd@rediffmail.com) : Locally-rotationally-symmetric bianchi type-V cosmology in general relativity. Pramana J Phys 2009, 72(2), 429-43.

A spatially homogeneous locally-rotationally-symmetric (LRS) Bianchi type-V cosmological model is considered with a perfect fluid in general relativity. We present two types of cosmologies (power-law and exponential forms) by using a law of variation for the mean Hubble parameter that yields a constant value for the deceleration parameter. We discuss the physical properties of the non-flat and flat models in each cosmology. Exact solutions that correspond to singular and non-singular models are presented. In a generic situation, models can be interpolated between different phases of the Universe. We find that a constant value for the deceleration parameter is reasonable for a description of different phases of the Universe. We arrive at the conclusion that the Universe decelerates when the value of the deceleration parameter is positive whereas it accelerates when the value is negative. The dynamical behaviours of the solutions and kinematical parameters like expansion, shear and the anisotropy parameter are discussed in detail in each section. Exact expressions for look-back time, luminosity distance and event horizon vs. redshift are derived and their significances are discussed in some detail. It has been observed that the solutions are compatible with the results of recent observations.

42 ref

013294   Shyam Chand;Rajput G;Sharma K C;Ahluwalia P K (Physics Dep, Himachal Pradesh Univ, Shimla-171 005, Email: shyam_hpu@yahoo.co.in) : Inter-dot coupling effects on transport through correlated parallel coupled quantum dots. Pramana J Phys 2009, 72(5), 887-902.

Transport through symmetric parallel coupled quantum dot system has been studied, using non-equilibrium Green function formalism. The inter-dot tunnelling with on-dot and inter-dot Coulomb repulsion is included. The transmission coefficient and Landaur-Buttiker like current formula are shown in terms of internal states of quantum dots. The effect of inter-dot tunnelling on transport properties has been explored. Results, in intermediate inter-dot coupling regime show signatures of merger of two dots to form a single composite dot and in strong coupling regime the behaviour of the system resembles the two decoupled dots.

5 illus, 35 ref

013293   Shrivastava K N (Physics Dep, University of Malaya, Kuala Lumpur-50603, Malaysia) : The derivation of the von Klitzing's constant. Natn Acad Sci Lett 2009, 32(7-8), 243-50.

The Hall resistivity is found to become a function of spin. For positive spin, one value is found but for negative sign in the spin, another value occurs. In this way, there is never only one value of the resistivity but there is doubling of values. The value of the von Klitzing's constant is a special case of more general dependence of resistivity on the spin. We investigate the effect of Landau levels. For extreme quantum limit, n=O, the effective charge of the electron becomes (l/2)ge. The fracªtional charge arises for finite value of the angular momentum. There is a formation of spin clusters. As the field increases, there is a phase transition from spin 1/2 to spin 3/2 so that g value becomes 4 and various values of n in Landau levels, g(n+ 1/2), form plateaus in the Hall resistivity. For finite values of the orbital angular momenta, many fractional charges emerge. The fractional as well as the integral values of the charge are in full agreement with the experimental data. The generalized constant is h/[(l/2)ge]e which under special conditions becomes h/e² which is the von Klitzing's constant. The flux is usually quantized in units of λo =hc/e. When the angular momentum is properly taken into account, hc/e is replaced by hc/(1/2)ge. Hence, we predict a new superfluid which has (1/2)ge in place of the charge, e.

^ssc4 illus, 1 table, 21 ref

013292   Shri Ram;Zeyauddin M;Singh C P (Applied Mathematics Dep, Institute of Technology, Banars Hindu Univ, Varanasi-221 005, Email: cpsphd@rediffmail.com) : Biancchi type-V cosmological models with perfect fluid and heat flow in Saez-Ballester therory. Pramana J Phys 2009, 72(2), 415-27.

Discuss the variation law for Hubble's parameter with av-erage scale factor in a spatially homogeneous and anisotropic Bianchi type-V space-time model, which yields constant value of the deceleration parameter. Derive two laws of variation of the average scale factor with cosmic time, one is of power-law type and the other is of exponential form. Exact solutions of Einstein field equations with perfect fluid and heat conduction are obtained for Bianchi type-V space-time in these two types of cosmologies. In the cosmology with the power-law, the solutions correspond to a cos-mological model which starts expanding from the singular state with positive deceleration parameter. In the case of exponential cosmology, present an accelerating non-singular model of the Universe. Finds that the constant value of deceleration parameter is reasonable for the present day Universe and gives an appropriate description of evolution of Universe. Also discussed different types of physical and kinematical behaviour of the models in these two types of cosmologies.

34 ref

013291   Shewale V H;Deshpande M D;Kanhere D G (Physics Dep, H.P.T. Arts and R.Y.K. Science College, Nasik-422 005, Email: vasundhara.aher@gmail.com) : Structures, energetics and magnetic properties of (NiSn)n clusters with n=1-6. Pramana J Phys 2009, 72(4), 699-710.

Reports the results of calculations which were performed to investigate equilibrium structures, electronic and magnetic properties of stoichiometric (NiSn)n clusters with n = 1-6 within the framework of density functional theory. The calculated results show that the structural arrangement of (NiSn)n clusters is dominated by the Ni-Sn and Ni-Ni interactions. We find that these binary clusters show significant variation in the geometries as compared to that of the host nickel clusters. The preference for tetrahedron unit of Ni₃ Sn is seen in the lowest-energy configuration of these clusters. The multi-centre bonding between Ni atoms play an important role in stabilizing the stoichiometric Ni-Sn clusters. Doping of Sn atoms enhances the binding energy and reduces the ionization potential of nickel clusters. These binary clusters prefer the lowest spin state. For (NiSn)6 the magnetic moment is 0 μB. The complete quenching of the cluster magnetic moment appears to be due to the antiferromagnetic alignment of atomic spins as revealed by the spin density plots.

8 illus, 1 table, 28 ref

013290   Sharma P;Jaiswal V K;Kandpal H C (National Physical laboratory (Council of Scfientific and Industrial Re, , Dr. K. S. Krishman Road, New Delhi-110 012, Email: hckandpal@mail.nplindia.ernet.in) : Ultraviolet radiation emitted by compact fluorescent lamps. MAPAN 2009, 24(3), 183-92.

To meet the objective of energy efficiency, increasing emphasis on use of energy saver compact fluorescent lamps (CFLs), makes it necessary to analyze the effect of radiation especially ultraviolet (UV) radiation on human health. Various types of CFLs in terms of various shapes, sizes and electrical powers are studied for UV content present in their radiation. Various parameters such as UV irradiance, ratio of UV irradiance to electrical power (χ) and ratio of UV power to luminous flux (k), for eighteen types of CFLs are studied to dictate their performance. As expected, both the UV output power and the luminous flux are reduced in the case of double envelope CFLs in comparison to single envelope CFLs, however, the k value is reduced more effectively. For all types of CFLs under study, k₁ for UVA remains less than 104 μW/lm, which is a safe limit for UVA. However. the study demonstrates that the use of CFLs might be detrimental to human health if these are used at shorter distance, e.g., in table lamps.

8 illus, 2 tables, 6 ref

013289   Sharma B R;Singh R N (Mathematics Dep, Dibrugarh Univ, Diburugarh-786 004, Email: bishwaramsharma@yahoo.com) : Baro-diffusion and thermal-diffusion in a binary fluid mixture confined in an inclined channel in presence of a weak magnetic field. Proc Natn Acad Sci India-Sect A 2009, 79(PtIII), 273-8.

The effect of inclination of a channel on separation of a binary mixture of viscous incompressible thermally and electrically conducting fluids in presence of a weak constant magnetic field perpendicular to the direction of flow is examined. The equations governing the motion, temperature distribution and concentration distribution are solved analytically. It has been found that the effects of pressure gradient and temperature gradient are to separate the components of the mixture. The inclination of channel has adverse effect on the rate of species separation while the intensity of the applied magnetic field enhanced the same.

5 illus, 10 ref

013288   Sharam I;Chand S;Sharma J N (Applied Sciences Dep, National Institute of Technology, Hamirpur-177 005, Email: indunithmr@gmail.com) : Acoustodiffusive Rayleight surface waves in a semiconductor material half-space in contact with fluid medium. Proc Natn Acad Sci India-Sect A 2009, 79(PtIII), 279-89.

The propagation of surface waves in a homogeneous isotropic, elastic semiconductor half-space in contact with fluid iayer (viscous or inviscid liquid) of thickness d or a fluid half-space in the context of linear theory of elasticity is studied. The secular equations for elaslodiffusive non-leaky and leaky Rayleigh waves are derived and some special cases are discussed. The functional iteration technique is used to solve the secular equations. The numerical solution is carried out for n-type semiconductor (silicon) material half-space underlying a fluid layer (or half-space) to study the interaction of various field quantities. The dispersiqm curves, attenuation coefficient profiles, specific loss factor of en ergy dissipation and relative frequency shift due to liquid loading for leaky and non-leaky Rayleigh waves in the elastodiffusive semi-/ conductor are presented.

7 illus, 1 table, 28 ref

013287   Sen D (Physics Dep, Maulana Azad College, Rafi Ahmed Kidwai Road, Kolkata-700 013, Email: debsen@vsnl.net) : Complementarity controversy in wave-particle duality revisited. Pramana J Phys 2009, 72(5), 765-75.

On the face of some recent experiments claiming the simultaneous presence of both 'sharp interference' and 'highly reliable which way information' and some others casting light on the origin of complementarity in quantum interferometric experiments, the whole issue is reviewed on the basis of our earlier precise formulation of Bohr's complementarity principle. It is pointed out that contradicting the principle (in this specific formulation) is impossible without contradicting quantum mechanics and a lack of general consensus regarding the origin of the mutual exclusiveness is at the root of the controversy and confusions.

62 ref

013286   Sebastian K S;Sabir M (Physics Dep, Cochin Science and Technology Univ, Cochin-682 022, Email: sudheersebastian@yahoo.com) : Hybrid synchronization of hyperchaotic Lu system. Pramana J Phys 2009, 72(4), 781-6.

In this paper, study the hybrid synchronization between two identical hyperchaotic Lu systems. Hybrid synchronization of hyperchaotic Lu system is achieved through synchronization of two pairs of states and anti-synchronization of the other two pairs of states. Active controls are designed to achieve hybrid synchronization between drive and response systems using the sum and difference of relevant variables of the chaotic systems. Numerical simulations are presented to evaluate the analysis and effectiveness of the controllers.

3 illus, 15 ref

013285   Sadeghi M;Kakavand T;Mokhtari L;Gholamzadeh Z (NO, Agricultural Medical & Industrial Research School, P.O. Box 31485-313, Karaj, Iran, Email: msadeghi@nrcam.org) : Determination of <. Pramana J Phys 2009, 72(2), 335-41.

Gallium-68 (T_1/2 = 68 min, I_β+ = 89%) is an important positron-emitting radionuclide for positron emission tomography and used in nuclear medicine for diagnos-ing tumours. This study gives a suitable reaction to produce ⁶⁸Ga. Gallium-68 excitation function via ⁶⁸Zn(p,n)⁶⁸Ga, ⁶⁸Zn(d, 2n)⁶⁸Ga, ⁷⁰Zn(p, 3n)⁶⁸Ga and ⁶⁵Cu(a,n)⁶⁸Ga re-actions were calculated by ALICE-91 and TALYS-1.0 codes. The calculated excitation function of ⁶⁸Zn(p, n)⁶⁸Ga reaction was compared with the reported measurement and evaluations. Requisite thickness of the targets was obtained by SRIM code for each re-action. The ⁶⁸Ga production yield was evaluated using excitation function and stopping power.

5 illus, 2 tables, 20 ref

013284   Roy S;Sinha C (Theoretical Physics Dep, Indian Association for the Cultivation of Science, Kolkata-700 032, Email: chand_sin@hotmail.com) : Fragmentation of positronium in collision with Li ion including electron loss to the continuum. Pramana J Phys 2009, 72(3), 527-45.

Fragmentation of ground state ortho-positronium (Ps) in collision with Li ion (Lⁱ⁺) is studied in the framework of post-collisional Coulomb distorted eikonal approximation (CDEA), giving special emphasis on the dynamics of the electron loss to the continuum (ELC) that occurs when the electron (e) and the positron (e+) are very close to each other in the velocity space (v_e (≈ v_p). The present model takes account of the two-centre effect on the ejected e which is crucial for a proper description of the ELC phenomena. Both the fully differential cross-section (TDCS) and the doubly differential cross-section (DDCS) (energy spectra) are investigated at intermediate and high incident energies. A broad distinct ELC peak centred around v_e (≈ v_p is noted in the e energy spectrum in contrast to the sharp ELC peak for a heavy projectile, corroborating the experimental findings. Two salient features are noted in the present study; (i) the shift of the e DDCS peak (summed over e+ angles) towards higher ejection energy with respect to half the residual energy of the system, (ii) comparison of the e and e+ energy spectra reflect a strong e-e+asymmetry with respect to the ratio v_e/v_p = 1. Both these features are in qualitative agreement with the experimental observations due to Armitage et al for Ps-He atom system and could be attributed to the post-collisional two-centre effect on e due to its parent nucleus (e⁺) and the screened target ion. Two different wave functions of the Li ion are chosen in order to test the sensitivity of the present results with respect to the choice of the wave function.

10 illus, 1 table, 40 ref

013283   Rechem D;Latreche S;Gontrand C (Electronique Dep, Laboratoire Hyperfrequence et Semi-Conducteur (L.H.S.), Faculte des Sc, 25000, Algerie, Email: rechem_dj@yahoo.fr) : Channel length scaling and the impact of metal gate work function on the performance of double gate-metal oxide semiconductor field-effect transistors. Pramana J Phys 2009, 72(3), 587-99.

Studies the effects of short channel on double gate MOSFETs. We evaluate the variation of the threshold voltage, the subthreshold slope, the leakage current and the drain-induced barrier lowering when channel length LCH decreases. Furthermore, quantum effects on the performance of DG-MOSFETs are addressed and discussed. We also study the influence of metal gate work function on the performance of nanoscale MOSFETs. We use a self-consistent Poisson-Schrodinger solver in two dimensions over the entire device. A good agreement with numerical simulation results is obtained.

10 illus, 25 ref

013282   Rao Karumuri S;Choudhury J;Sarkar N K; Bhattacharjee R (Physics Dep, Assam Univ, Silchar-788 011, Email: srinivasa_karumuri@rediffmail.com) : Vibrational spectra of nickel metalloporphyrins: an algebraic aproach. Pramana J Phys 2009, 72(3), 517-25.

One of the most interesting areas of current research in molecular physics is the study of the vibrationally excitated states of medium and large molecules. In view of the considerable amount of experimental activity in this area, one needs theoretical models within which to interpret experimental data. Using Lie algebraic method, the vibrational energy levels of nickel metalloporphyrins like Ni(OEP), Ni porphyrin and Ni(TPP) are calculated for 16 vibrational modes. The algebraic Hamiltonian H = E₀ + (Σⁿ_i=1 A_iC_i + (Σⁿ_i<60>j A_ijC_ij + (Σⁿ_i<60>j λ_ij M_ij, where A_i, A_ij and λ_ij are the algebraic parameters which vary from molecule to molecule and C_i, C_ij and M_ij are algebraic operators. The vibrational energy levels are calculated using algebraic model Hamiltonian and the results are compared with the experimental values. The results obtained by this model are very accurate.

2 illus, 3 tables, 17 ref

013281   Paul D;Paul B C;Meng S H (Physics Dep, North Bengal Univ, Siliguri, Dist. Darjeeling-734 013, Email: xhm@nankai.edu.cn) : Inflation with hyperbolic potential in the Braneworld model. Pramana J Phys 2009, 72(5), 903-14.

In this paper study inflationary dynamics with a scalar field in an inverse coshyperbolic potential in the braneworld model. Authors note that a sufficient inflation may be obtained with the potential considering slow-roll approximation in the high energy limit. We determine the minimum values of the initial inflaton field required to obtain sufficient inflation and also determine the relevant inflationary parameters. The numerical values of spectral index of the scalar perturbation spectrum are determined by varying the number of e-foldings for different initial values of the inflaton field. The result obtained here is in good agreement with the current observational limits.

4 illus, 3 tables, 22 ref

013280   Parkar V V;Jha V;Santra S;Roy B J; Ramachandran K;Shrivastava A;Mahata K;Chatterjee A;Kailash S (Nuclear Physics Div, Bhabha Atomic Research Centre, Mumbai-400 085, Email: parkarvivek@rediffmail.com) : Reaction mechanism study of <. Pramana J Phys 2009, 72(2), 363-73.

The elastic scattering and the ⁶He angular distributions were measured in ⁷Li + ⁷Li reaction at two energies, E_1ab = 20 and 25 MeV. FRDWBA calculations have been performed to explain the measured ⁶He data. The calculations were very sensitive to the choice of the optical model potentials in entrance and exit channels. The one-step proton transfer was found to be the dominant reaction mechanism in ⁶He production.

7 illus, 3 tables, 24 ref

013279   Pandikumar G;Gopalakrishnan V;Mohanakrishnan P (Reactor Physics Div, Indira Gandhi Centre for Atomic Research, Kalpakkam-603 102) : Multiple recycling of fuel in prototype fast breeder reactor. Pramana J Phys 2009, 72(5), 819-32.

In a thermal neutron reactor, multiple recycle of U-Pu fuel is not possible due to degradation of fissile content of Pu in just one recycle. In the FBR closed fuel cycle, possibility of multi-recycle has been recognized. In the present study, Pu-239 equivalence approach is used to demonstrate the feasibility of achieving near constant input inventory of Pu and near stable Pu isotopic composition after a few recycles of the same fuel of the prototype fast breeder reactor under construction at Kalpakkam. After about five recycles, the cycle-to-cycle variation in the above parameters is below 1%.

8 illus, 5 tables, 5 ref

013278   Ozdemir Z G;Aslan O;Onbasli U (Physics Dep, Yildiz Technical Univ, Davutpasa Campus, Esenler 34210, Istanbul, Turkey, Email: zguvenozdemir@yahoo.com) : Terahertz oscillations in mercury cuprate superconductors. Pramana J Phys 2009, 72(4), 755-63.

It has been recently reported that the three-dimensional Bose-Einstein condensation of the quasi-particles is valid for the mercury cuprates at liquid helium temperature. In this study, the validity of the interlayer theory in three dimensions has been investigated for optimally oxygen-doped mercury cuprates at the temperature interval of 0-15 K. Furthermore, some thermodynamic and electrodynamics parameters of mercury cuprates have been calculated for both the under-doped and the over-doped samples at the vicinity of 4.2 K. Moreover, it has been determined that the superconducting system behaves as a terahertz wave cavity regardless of the oxygen doping concentration.

3 illus, 4 tables, 20 ref

013277   Ningthoujam R S;Gajbhiye N S;Sharma S (Chemistry Div, Bhabha Atomic Research Centre, Mumbai-400 085, Email: rsn@barc.gov.in) : Raduction mechanism of Ni<. Pramana J Phys 2009, 72(3), 577-86.

The reduction mechanism of Ni²⁺ into Ni particles using different precursors such as NiCl2 solution, NiO powder and Ni[(NH₃)₆] Cl₂ complex has been established. Different particle sizes can be designed from these precursors. The smallest crystallite size (12 nm) can be obtained from Ni[(NH₃)₆]Cl₂ complex in the presence of the stabilizing ligand (oleic acid). The field-cooled (FC) and zero-field-cooled (ZFC) magnetization of Ni particles obtained from Ni[(NH₃)₆]Cl₂ complex in the temperature range 5-300 K established the ferromagnetic interaction up to 300 K. The magnetization values at three different temperatures 5, 70 and 300 K are 50.2, 49.5 and 45.5 Oe respectively at 3 x 10⁴ Oe applied field and such values are less than that of the bulk value. The Curie temperature (Tc) decreases slightly with the decrease of particle size. This study will provide guidance in the preparation of metal nanoparticles from different precursors.

8 illus, 35 ref

013276   Nevas S;Lindemann M;Sperling A;Teuber A;Maass R (Physikalisch-Technische Bundesanstalt (PTB), , Bundesallee 100, D-38116, Email: saulius.nevas@pth.de) : Colorimetry of LEDs with aray spectroradiometers. MAPAN 2009, 24(3), 153-62.

Compact and cost-effective array spectroradiometers are increasingly used in photometric and radiometric measurements. In this report, results of the colorimetric characterisation of LEDs using both law-end and high-end array spectroradiometers are compared to those obtained with the help of a conventional scanning double-monochromator spectroradiometer. Problems related to the utilisation of the array spectroradiometers for such applications are discussed. Effects of the most important instrumental parameters, such as the stray light suppression and the bandpass irregularities, are also assessed. The comparison shawed an agreement among the results provided by the different spectroradiometers within the typical uncertainty levels, even for the law-end devices.

11 illus, 4 tables, 6 ref

013275   Naseema K;Rao V;Sujith K V;Kalluraya B (Materials Science Dep, Mangalore Univ, Mangalagangothri-574 199, Email: vijraobrns@rediffmail.com) : Phase-matchable nonlinear optical crystal 4-amino-5-mercapto-3[1-(4-isobutylphenyl) ethyl]-1,2,4-triazole: synthesis, crystal growth and characterization. Pramana J Phys 2009, 72(4), 719-29.

In this paper, report the synthesis, growth and characterization of a new organic NLO single crystal of 4-amino-5-mercapto-3-[1-(4-isobutylphenyl)ethyl]-1,2,4-triazole (AMIT). The title compound is synthesized and single crystals were grown by the slow evaporation technique at room temperature. The grown crystal was characterized by powder XRD, FTIR, UV-Vis. and microhardness studies. The thermal analysis of the crystal was carried out by TGA, DTA and DSC. From DSC, the melting point of the crystal is found to be 168°C. The scanning electron microscopy (SEM) provides information about the surface morphology of the crystal. The SHG efficiency has been estimated as 0.3 times that of KDP using Kurtz powder method and is found to be a phase-matchable NLO crystal.

9 illus, 2 tables, 12 ref

013274   Nandy M;Sarkar P K;Nakao N;Shibata T (Chemical Sciences Div, Saha Institute of Nuclear Physics, 1/AF, Bidhan Nagar, Kolkata-700 064, Email: maitreyee.nandy@saha.ac.in) : Measurement and theoretical estimation of induced activity in <. Pramana J Phys 2009, 72(4), 669-83.

Induced radioactivity in natural indium ^nat In) foils by high energy neutrons was measured at the KENS Facility, KEK, Japan, where a 16.7 cm thick W target was bombarded by protons of 500 MeV. High energy neutrons consequently produced irradiated the In targets placed at different depths inside a 4 m thick concrete shield placed at the beam exit. The measured activities were compared with the results calculated using the nuclear reaction model codes ALICE-91 and EMPIRE-2.18. To estimate the induced activity, excitation functions of the various radionuclides were calculated using the two codes and folded with the appropriate neutron energy distribution at different depths of the concrete shield. The calculated excitation functions of a given nuclide were found to vary widely from one another in some cases. The performances of the codes for different input parameters like level densities and inverse cross-sections are reported in this paper. Our analysis shows that neither of the two codes reproduced all the measured activities satisfactorily, requiring further improvements in the models adopted.

6 illus, 4 tables, 8 ref

013273   Meyur S;Dednath S (NO, TRGR Khemka High School, Pi23, Rabindra Sarani, Liluah, Howarah-711 204, Email: debnathmeyur@yahoo.co.in) : Complexification of three potential models-II. Pramana J Phys 2009, 72(4), 627-37.

A new kind of PT and non-PT-symmetric complex potentials are constructed from a group theoretical viewpoint of the sl(2, C) potential algebras. The real eigenvalues and the corresponding regular eigenfunctions are also obtained. The results are compared with the ones obtained before

14 ref

013272   Mao L F (School of Electronics & Information Engineering, Soochow Univ, 178 Gan-jiang East Road, Suzhou 215 021, People's Republic of China, Email: mail_lingfeng@yahoo.com.cn) : Effects of quantum coupling on the perfromance of metal-oxide-semiconductor field transistors. Pramana J Phys 2009, 72(2), 407-14.

Based on the analysis of the three-dimensional Schrodinger equation, the effects of quantum coupling between the transverse and the longitudinal components of channel electron motion on the performance of ballistic MOSFETs have been theoretically investigated by self-consistently solving the coupled Schrodinger-Poisson equations with the finite-difference method. The results show that the quantum coupling between the transverse and the longitudinal components of the electron motion can largely affect device performance. It suggests that the quantum coupling effect should be considered for the performance of a ballistic MOSFET due to the high injection velocity of the channel electron.

2 illus, 1 table, 10 ref

013271   Manjunathaguru V;Umesh T K (Studies in Physics Dep, Manasagangothri, Mysore Univ, Mysore-570 006, Email: tku@physics.uni-mysore.ac.in) : Simple parametrization of photon mass energy absorption coeffcients of H-, C-, N- and O-based samples of biological interest in the energy range 200-1500 ke V. Pramana J Phys 2009, 72(2), 375-87.

Provides polynomial coefficients and a semi-empirical relation using which one can derive photon mass energy absorption coefficient of any H-, C-, N-, 0-based sample of biological interest containing any other elements in the atomic number range 2-40 and energy range 200-1500 keV. More interestingly, it has been observed in the present work that in this energy range, both the mass attenuation coefficients and the mass energy absorption coefficients for such samples vary only with respect to energy. Hence it was possible to represent the photon interaction properties of such samples by a mean value of these coefficients. By an independent study of the variation of the mean mass attenuation coefficient as well as mass energy absorption coefficient with energy, two simple semi-empirical relations for the photon mass energy absorption coefficients and one relation for the mass attenuation coefficient have been obtained in the energy range 200-1500 keV. It is felt that these semi-empirical relations can be very handy and convenient in biomedical and other applications. One possible significant conclusion based on the results of the present work is that in the energy region 200-1500 keV, the photon interaction characteristics of any H-, C-, N-, O-based sample of biological interest which may or may not contain any other elements in the atomic number range 2-40 can be represented by a sample-independent (single) but energy-dependent mass attenuation coefficient and mass energy absorption coefficient.

3 illus, 3 tables, 7 ref

013270   Malik R P;Mandal B P (Physics Dep, Centre of Advanced Studies, Banaras Hindu Univ, Varanasi-221 005) : Nilpotent symmetry invariance in the non-Abelian 1-form gauge therory: superfield formalism. Pramana J Phys 2009, 72(3), 505-15.

Demonstrate that the nilpotent Becchi-Rouet-Stora-Tyutin (BRST) and anti-BRST symmetry invariance of the Lagrangian density of a four (3 + l)-dimensional (4D) non-Abelian 1-form gauge theory with Dirac fields can be captured within the framework of the superfield approach to BRST formalism. The above 4D theory, where there is an explicit coupling between the non-Abelian 1-form gauge field and the Dirac fields, is considered on a (4,2)-dimensional supermanifold, parametrized by the bosonic 4D space-time variables and a pair of Grassmannian variables. We show that the Grassmannian independence of the super-Lagrangian density, expressed in terms of the (4,2)-dimensional superfields, is a clear signature of the presence of the (anti-)BRST invariance in the original 4D theory.

29 ref

013269   Malik R P;Mandal B P (Physics Dep, Centre of Advanced Studies, Banaras Hindu Univ, Varanasi-221 005) : Superfield approach to symmetry invariance in quantum electrodynamics with complex scalar fields. Pramana J Phys 2009, 72(5), 805-18.

Shows that the Grassmannian independence of the super-Lagrangian density, expressed in terms of the superfields defined on a (4,2)-dimensional supermanifold, is a clear-cut proof for the Becchi-Rouet-Stora-Tyutin (BRST) arnd anti-BRST invari-ance of the corresponding four (3+l)-dimensional (4D) Lagrangian density that describes the interaction between the U(l) gauge field and the charged complex scalar fields. The above 4D field theoretical model is considered on a (4,2)-dimensional supermanifold parametrized by the ordinary four space-time variables xμ (with μ = 0,1,2,3) and a pair of Grassmannian variables. Geometrically, the (anti-)BRST invariance is encoded in the translation of the super-Lagrangian density along the Grassmannian directions of the above supermanifold such that the outcome of this shift operation is zero.

42 ref

013268   Mahmoud E E D (NO, National Institute of Standard (NIS), Tersa st. Elharam, Giza, Egypt, Email: essam 70@yahoo.com) : Realization of relative humidity scale from 10% to 98% at 25°C. MAPAN 2009, 24(4), 241-6.

The accurate measurements of relative humidity are increasingly needed in most of the Egyptian industries. The relative humidity has its own effect in the manufacturing of medicine, steel, metals, textile and is of great importance for controlling the environmental conditions in the factories. As a result of the above facts, it was found that the realization of Egyptian humidity scale is of prime importance for National Institute for Standards (NIS). The scale was realized using two-pressure humidity generator and humidity chamber as a medium, chilled mirror hygrometer to measure dewªpoint and RTD to measure air temperature. The relative humidity scale was realized in the range from 10% to 92% using two-pressure humidity generator [1] and from 92% to 98% using humidity chamber at 25°C. All points of results were stable for more than 6 hours with stability range from 0.18% to 0.28%. The uncertainty was evaluated at a confidence evel of 95 % within 1.1 % to 1.8% in the range from 10% to 92% and from 92% to 98%, respectively. The present measurement system is suitable for accurate calibration of different digital or chart hygrometers.

3 illus, 1 table, 11 ref

013267   Maheshwari N;Sharma D K;Khurana M S;Rai J (Applied Science & Humanities Dep, Manav Rachna College of Engineering, Faridabad-121 001, Email: mah.nishi@gmail.com) : Ionospheric ion density variation in the low and mid latiude ionosphere: possible connection with earthquake. Indian J Radio Space Phys 2010, 39(6), 353-8.

The problem of earthquake prediction has revealed correlation between seismic activity and ionospheric ion temperature and density anomalies. This paper presents observations of the ion density measured with the help of Retarding Potential Analyzer (RPA) payload aboard Indian SROSS-C2 satellite in the altitude <126>500 km. The satellite data was analyzed from January 1995 to December 1996 to see the fluctuations in ion density over the seismic region. The emphasis of this paper is on the anomalies in the low and mid latitude ionosphere. The results obtained confirm the earlier results of ion temperature anomalies over the same region.

4 illus, 1 table, 32 ref

013266   Maharaj S D;Thirukkanesh S (Astrophysics and Cosmology Research Unit, School of Mathematical Sciences, KwaZulu-Natal Univ, Private Bag X54001, Durban 4000, South Arfica, Email: maharaj@ukzn.ac.za) : Generalized isothermal models with strange equation of state. Pramana J Phys 2009, 72(3), 481-94.

Considers the linear equation of state for matter distributions that may be applied to strange stars with quark matter. In our general approach the compact relativistic body allows for anisotropic pressures in the presence of the electromagnetic field. New exact solutions are found to the Einstein-Maxwell system. A particular case is shown to be regular at the stellar centre. In the isotropic limit we regain the general relativistic isothermal Universe. We show that the mass corresponds to the values obtained previously for quark stars when anisotropy and charge are present.

5 illus, 34 ref

013265   Lindemann M;Maass R (Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100, , D-38116 Braunschweig, Germany, Email: Mathias, Lindemann@ptb.de) : Photometry and colorimetry of reference LEDs by using a compact goniophotometer. MAPAN 2009, 24(3), 143-52.

In the development, production control, quality assurance and during the selection of appropriate LEDs for very different applications, it is essential to know their photometric and colorimetric quantities very precisely. The calibration of the measuring devices required for this purpose is performed via LED transfer standards. These LED standards transfer photometric, spectroradiometric and colorimetric units and characteristics, from the National Metrology Institute (NMI) to the user. Finally, LED standards serve as references for the user. Usually a set of LED reference standards consists of at least four different LED colours (blue, green, red and white), sometimes even more. Further more it is very often necessary to have more than only one set of reference standards as a backup. This generally causes a large number of calibrations. To handle this work load, a special reference standard and a compact goniophotometer prove to be a considerable advantage. PTB developed a special LED transfer standard which operates under controlled conditions: a controlled LED chip temperature and a controlled chip current help to keep the photometric and colorimetric properties constant. On the other hand, a compact goniophotometerwas designed to measure luminous flux, luminous intensity and colorimetric quantities of LED transfer standards in a relatively short time with low measurement uncertainties.

13 illus, 4 ref

013264   Liang M;Shu S L;Yuan B (Physics Dep, School of Science, Tianjin Univ, Tianjin-300 072, China, Email: mailinliang@yahoo.com.cn) : Quantum-classical correspondence of the Dirac equation with a scalar-like potential. Pramana J Phys 2009, 72(5), 777-85.

Quantum matrix elements of the coordinate, momentum and the velocity operator for a spin-1/2 particle moving in a scalar-like potential are calculated. In the large quantum number limit, these matrix elements give classical quantities for a relativistic system with a position-dependent mass. Meanwhile, the Klein-Gordon equation for the spin-0 particle is discussed too. Though the Heisenberg equations for both the spin-0 and spin-1/2 particles are unlike the classical equations of motion, they go to the classical equations in the classical limit.

14 ref

013263   Laha U (Physics Dep, National Institure of Technology, Jamshedpur-831 014, Email: ujjwal.laha@gmail.com) : Integral transform of green's function, off-shell jost solution and T-matrix for Coulomb-Yamaguchi potential in coordinate representation. Pramana J Phys 2009, 72(3), 457-72.

By exploiting the theory of ordinary differential equations together with certain properties of higher transcendental functions, a useful analytical expression for the integral transform of the Green's function for motion in Coulomb-Yamaguchi potential is derived via the r-space approach. This integral transform is applied to construct an analytical expression for off-shell Jost solution in its 'maximal reduced form' involving confluent and Gaussian hypergeometric functions. Corresponding Jost functions automatically follow from this solution. Finally, as another application of the off-shell Jost solution, the off-shell T-matrix is calculated by using a modified relation between off-shell physical wave function and T-matrix which does not involve the potential explicitly, thereby avoiding certain difficult integrals, and expressed it in terms of rational functions and simple hypergeometric functions which is in exact agreement with the results given previously by other authors.

2 illus, 32 ref

013262   Kumar V (Nuclear Physics Div, Bhabha Atomic Research Centre, Mumbai-400 085, Email: vkv1951@gmail.com) : Extension of CASCADE.04 to estimate neutron fluence and dose rates and its validation. Pramana J Phys 2009, 72(3), 601-9.

Capability to compute neutron dose rate is introduced for the first time in the new version of the CASCADE.04 code. Two different methods, 'track length estimator' and 'collision estimator' are adapted for the estimation of neutron fluence rate needed to calculate the ambient dose rate. For the validation of the methods, neutron dose rates are experimentally measured at different locations of a 5Ci Am-Be source, shielded in Howitzer-type system and these results are compared with those estimated using (i) modified CASCADE.04.d and (ii) MCNP4A codes and it is found that the agreement is good. The paper presents details of modification and results of the comparative study.

4 illus, 15 ref

013261   Kompalli S K;Babu S S;Moorthy K K (Space Physcs Laboratory, Vikarm Sarabhi Space Center, Triuvananthapuran-695 022, Email: ssc.gov.in) : Inter-comparison of aerosol optical depth from the multi-wavelength solar radiometer with other radiometeric measurements. Indian J Radio Space Phys 2010, 39(6), 364-71.

The Multi-Wavelength Solar Radiometer (MWR), designed and developed in the Space Physics Laboratory, has been extensively used by several research institutions across the country for estimating columnar spectral aerosol optical depth (AOD), the most important parameter needed for assessing the impact of aerosols on regional aerosol forcing. A network of <62> 30 MWRs is currently in operation under the Aerosol Radiative Forcing over India (ARFI) Project of Indian Space Research Organization's Gcosphere Biosphere Program (ISRO-GBP). This paper reports the results of an extensive inter-comparison of the AODs deduced using the MWR with those obtained from other commercially available instruments, such as a Multi-Filter Rotating Shadowband Radiometer (MFRSR), a calibrated Microtops Sun Photometer (MTOPS) and an EKO Sun Photometer (ESP). The results indicated very good agreement between the AOD derived from MWR with MFRSR, MTOPS and ESP with correlation coefficients of ~ 0.99, 0.88 and 0.92, respectively. This report is intended to serve as a reference document for researchers while using the MWR along with other commercial instruments.

3 illus, 2 table, 17 ref

013260   Karunakaran S;Nair K N S (Technology Development Div, Bhabha Atomic Research Centre, Trombay, Mumbai-400 085) : Development of a novel spent fuel chopper for PHWR fuel. BARC Newsl 2010, (NULL), 35-8.

Decladding of spent PHWR fuel is achieved by mechanically chopping the spent fuel employing special purpose shearing machine. Spent Fuel Chopper based on progressive feeding, clamping and chopping has been in operation in the present operating reprocessing plants located in Tarapur and Kalpakkam. Valuable experience has been gained in operation and maintenance aspects of this equipment over the years. In order to increase the productivity and reduce the maintenance down time, a new spent fuel chopper based on gang chopping concept has been developed incorporating the good features of the existing model. The first spent fuel chopper designed and manufactured as per new concept has undergone cold commissioning in ROP Tarapur and hot commissioning is in progress.

7 illus

013259   Kaplan A;Aydin A;Tel E;Sarer B (Faculty of Arts and Sciences, Suleyman Demirel Univ, 32260, Isparta, Turkey, Email: aaydin@kku.edu.tr) : Equilibrium and pre-equilibrium emissions in proton-induced reactions on <. Pramana J Phys 2009, 72(2), 343-53.

In this study, the excitation functions for the reactions ²⁰³Tl(p, n)²⁰³Pb, ²⁰⁵Tl(p,3n)²⁰³Pb, ²⁰³Tl(p,2n)²⁰²Pb, ²⁰⁵Tl(p, 4n)²⁰²Pb, ²⁰³Tl(p, 3n)²⁰¹Pb, ²⁰⁵Tl(p,5ni)²⁰¹Pb, ²⁰³Tl(p,4n)²⁰⁰Pb and ²⁰⁵Tl(p, 6n)²⁰⁰Pb have been calculated using pre-equilibrium and equilibrium reaction mechanisms. Calculated results based on hybrid model, geometry-dependent hybrid model and cascade-exciton model have been compared with the experimental data.

8 illus, 1 table, 24 ref

013258   Kanjilal D;Saha S (Nuclear & Atomic Physics Div, Saha Institute of Nuclear Physics, Kolkata-700 064, Email: satyajit.saha.ac.in) : Electric field distribution and simulation of avalanche formation due to the passage of heavy ions in a parallel grid avalanche counter. Pramana J Phys 2009, 72(5), 833-44.

Electric field distributions and their role in the formation of avalanche due to the passage of heavy ions in parallel grid avalanche type wire chamber detectors are evaluated using a Monte Carlo simulation. The relative merits and demerits of parallel and crossed wire grid configurations are studied. It is found that the crossed grid geometry has marginally higher gain at larger electric fields close to the avalanche region. The spatial uniformity of response in the two wire grid configurations is also compared.

7 illus, 17 ref

013257   Kamlesh Singh;Shrivastava P K (Physics Dep, Govt PG Science College, Rewa-486 001) : Tri-diurnal anisotropy of cosmic ray daily variation for the solar cycle 23. Indian J Radio Space Phys 2010, 39(6), 341-5.

An extensive study of tri-diurnal anisotropy of cosmic ray daily variations for the period 1996 - 2006 has been carried out using cosmic ray neutron monitor data of Kiel and Beijing. The daily and yearly averages of tri-diurnal wave amplitude and phase have been obtained to observe long term behaviour of third harmonic of cosmic ray daily variation. The relation between amplitudes and phases (annual and daily averages) of tri-diurnal data for these two different cut off rigidities has been shown. No long-term variational trend is seen in tri-diurnal anisotropy. On day-to-day analysis, a well defined peak in tri-diurnal amplitude between 0.06% and 0.010% is observed.

4 illus, 1 table, 15 ref

013256   Joshi D;Bhatnager D A;Kumar A;Gupta R (National Physical Laboratory(NPLI), Council of Seientific and Industrial Research (CSIR), New Delhi-10 012, Email: akumar@nplindia.ernet.in) : Direct measurement of acoustic impedance in liquids by a new pulse echo technique. MAPAN 2009, 24(4), 215-24.

For the first time a novel experimental technique has been used for direct evaluation of acoustic impedance of liquids. Till date researchers have been using ultrasonic velocity and density measurements to compute acoustic impedance and thermodynamic parameters, which are then used to investigate the nature of molecular interactions of solvent molecules in binary, ternary and quaternary liquid mixtures. Evaluation of acoustic impedance directly is a step in minimizing the cumbersome process of measuring velocities and densities separately of solutions having different mole fraction concentration. Acoustic impedances of ten pure polar and non polar solvents have been determined at different temperatures of 298K, 303K and 308K. This is further coupled with in line simultaneous determination of ultrasonic velocities of the solvents. In order to establish the new method, results have been discussed by comparing the calculated ultrasonic velocity from the experimental acoustic impedance, ultrasonic velocity determination by delay time of flight and the literature values of ultrasonic velocity of the pure solvents.

7 illus, 3 tables, 20 ref

013255   John M P;Jijo P U;Nandakumaran V M (International School of Photonics, Cochin Sciences and Technology Univ, Kochi-682 022, Email: mpjohn@gmail.com) : Effect of a fluctuating parameter mismatch and the associated time-scales on coupled Rossler oscillators. Pramana J Phys 2009, 72(3), 495-503.

Study the effect of parameter fluctuations and the resultant multiplicative noise on the synchronization of coupled chaotic systems. We introduce a new quantity, the fluctuation rate (φ as the number of perturbations occurring to the parameter in unit time. It is shown that (φ is the most significant quantity that determines the quality of synchronization. It is found that parameter fluctuations with high fluctuation rates do not destroy synchronization, irrespective of the statistical features of the fluctuations. We also present a quasi-analytic explanation to the relation between (φ and the error in synchrony.

5 illus, 23 ref

013254   Jaiswal S K;Tang Y (National Physical Laboratory (NPLI), Council of Scientific and Industrial Research (CSIR), New Delhi-110 012, Email: yi-hua.tang@nist.gov) : Direct comparison between the NIST 10 V compact josephson voltage standard and the 2.5 V programmable josephson voltage standard. MAPAN 2009, 24(4), 207-14.

The NIST 10 V Compact Josephson Voltage Standard (CJVS) and 2.5 V Programmable Josephson Voltage Standard (PJVS) were directly compared at 1.018 V and 2.511 V in February 2007. The difference between the two systems at 1.018 V (CJVS - PJVS) was -0.09 n V with an expanded uncertainty of 4.72 nV or a relative uncertainty of4.64xlO'9 at the 95 % confidence level where as the difference between the two systems at 2.511 V was 0.00 n V with an expanded uncertainty of 4.04 n V or a relative uncertainty; of 1.61 x 10^-9 at the 95 % confidence level. These intercomparison results demonstrated the satisfacton; performance of the CJVS system handling minor trapped flux in the array and the effectiveness of the" NISTVolt software" to manage step jumps in the measurements.

7 illus, 4 tables, 11 ref

013253   Jain S R (Nuclear Physics Div, Bhabha Atomic Research Centre, Mumbai-400 094, Email: srjain@barc.gov.in) : Ground state of an arbitrary triangle with a Calogero-Sutherland-Moser potential. Pramana J Phys 2009, 72(3), 611-5.

Constructs the expression for the ground state eigenfunction of the Schrodinger equation for a particle inside an arbitrary planar triangle under the influence of a potential.

2 illus, 8 ref

013252   Hauer K O;Hope A (Physikalisch-Technische Bundesanstalt, , Bundesallee 100, 38116, Email: andreas.hoepe@ptb.de) : High-grade uniform light source for radiometric and photometric applications. MAPAN 2009, 24(3), 175-82.

Versatile applications in radiometry and photometry require uniform light source systems with a highly Lambertian radiance/luminance output. Examples for this kind of requirements include different applications such as calibration of photometers and radiometers, testing of electronic imaging devices like CCDs or similar array detectors or the use as a homogenous light source in, for instance, gonioreflectometric measurements. At the Physikalisch- Technische Bundesanstalt (PTB) a homogenous sphere radiator consisting of a medium sized integrating sphere (e = 150 mm) with an internal reflector in the equatorial plane was developed. In its first stage of development it was equipped with an internal 250 W quartz tungsten halogen lamp. This sphere radiator had a radiance homogeneity of 99.8% of the emitted radiation measured in the plane of the limiting aperture (e = 40 mm) at the output of the device. In the latest design of the system the radiative output power could be increased by a factor of about 3 by the use of an internal 400 W quartz tungsten halogen lamp while nearly maintaining homogeneity.

8 illus, 8 ref

013251   Harikrishnan K P;Misra R;Ambika G (Physics Dep, The Cochin College, Cochin-682 002, Email: kp_hk2002@yahoo.co.in) : Efficient use of correlation entropy for analysing time series data. Pramana J Phys 2009, 72(2), 325-33.

The correlation dimension D₂ and correlation entropy K₂ are both important quantifiers in nonlinear time series analysis. However, use of D₂ has been more common compared to K₂ as a discriminating measure. One reason for this is that D₂ is a static measure and can be easily evaluated from a time series. However, in many cases, especially those involving coloured noise, K₂ is regarded as a more useful measure. Here we present an efficient algorithmic scheme to compute K₂ directly from a time series data and show that K₂ can be used as a more effective measure compared to D₂ for analysing practical time series involving coloured noise.

7 illus, 17 ref

013250   Hadalgi P M;Madhuri R G;Mallikarjun S L (PG Studies and Research in Applied Electronics Dep, Gulbarga Univ, Gulbarga-585 106, Email: rg_madhuriv@rediffmail.com) : Slot-fed widebad dielectic resonator antenna for wireless applications. Indian J Radio Space Phys 2010, 39(6), 372-5.

In this paper, a slot-fed dielectric resonator antenna (DRA) with wideband operations in 4-6 GHz frequency band is presented. Slot represents coupling mechanism between resonators and the microstrip line. The DRA and slot are both resonant structures. The microstrip feed line is positioned at right angle to the center of the slot for efficient coupling. Together they yield a double resonant structure with low cross-polarization levels and identical radiation patterns. With proper design, the two resonances can be merged to achieve wide bandwidth. The rectangular dielectric resonator placed at the center of the rectangular ring slot provides an impedance bandwidth of 42.1%. The return loss and radiation patterns of these are presented.

7 illus, 16 ref

013249   Gutierrez C L;De Sanctis M (NO, Pedagogica y Tecnologica de Colombia Univ, Tunja, Boyaca, Colombia, Email: maurizio.desanctis@romal.infn.it) : Relativistic quark-diquark model for the nucleon. Pramana J Phys 2009, 72(2), 451-6.

Developed a constituent quark-diquark model for the nucleon and its resonances using a harmonic oscillator potential for the interaction. The effects due to relativistic kinetic energy correction are studied. Finally, charge form factor of the model is calculated and compared with experimental data.

2 illus, 1 table, 9 ref

013248   Goyal S L;Gur P (Applied Physics Dep, Guru Jambheshwar Science & Technology Univ, Hisar-125 001, Email: goyalsneh@yahoo.com) : Empirical relation and establishment of shell effects in (n,2n) reaction cross-sections at 14 MeV. Pramana J Phys 2009, 72(2), 335-62.

The experimental data for (n, 2n) reaction cross-sections around 14 MeV neutron energy have been collected from the literature and analysed for the isotopes having 1 ≤ Z ≤ 82. The empirical relations for the reaction cross-sections have been obtained, which show fairly good fits with the experimental values. The shell effects have been established at magic nucleon numbers for (n, 2n) reaction cross-sections around 14 MeV neutron energy. The odd-even effects have also been observed as the cross-sections for odd-mass nuclei are higher than their neighbouring even-even nuclei.

4 illus, 16 ref

013247   Ghosh P K;Ghosal A;Chattopadhyay D (NO, Murshidabad College of Engineering and Technology, Berhampur-742 102, Email: pkgmeet@yahoo.com) : Magnetoelectronic transport of the two-dimensional electron gas in CdSe single quantum wells. Pramana J Phys 2009, 72(2), 399-405.

Hall mobility and magnetoresistance coefficient for the two-dimensional (2D) electron transport parallel to the heterojunction interfaces in a single quantum well of CdSe are calculated with a numerical iterative technique in the framework of Fermi-Dirac statistics. Lattice scatterings due to polar-mode longitudinal optic (LO) phonons, and acoustic phonons via deformation potential and piezoelectric couplings, are considered together with background and remote ionized impurity interactions. The parallel mode of piezoelectric scattering is found to contribute more than the perpendicular mode. We observe that the Hall mobility decreases with increasing temperature but increases with increasing channel width. The magnetoresistance coefficient is found to decrease with increasing temperature and increase with increasing magnetic field in the classical region.

3 illus, 1 table, 7 ref

013246   Ghosh D;Deb A;Lahiri M B;Biswas S;Mandal P (Physics Dep, Nuclear and Particle Physics Research Centre, Jadavpur Univ, Kolkata-700 032, Email: dipakghosh_in@yahoo.com) : Multiplicity fluctuations of pions and protons at SPS energy-an in-depth analysis with factrorial correlator. Pramana J Phys 2009, 72(4), 685-97.

Computes the factorial correlators to study the dynamical fluctuations of pions and a combination of pions and protons (compound multiplicity) in ³²S-AgBr interactions at 200 A GeV. The study reveals that for both pion and compound multiplicity the correlated moments increase with the decrease in bin-bin separation D, following a power-law, which suggests the self-similarity of multiplicity fluctuation in each case. The results of the analysis also show a consistency with the prediction of α-niodel for the existence of intermittency in both cases.

7 illus, 3 tables, 40 ref