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Bhattacharya, R.
State Univ. of New York, Stony Brook (USA)1976
State Univ. of New York, Stony Brook (USA)1976
AbstractAbstract
[en] Charged heavy lepton production in proton-proton collisions is studied. Motivated by recent experimental results from the Stanford Linear Accelerator Center a parton model analysis is given of the reaction p + p → L+ + L- + x → μ+- + e/-+/ + neutrinos + x. Results are presented for the total cross section and the differential cross sections with respect to the invariant mass squared of the final charged leptons and the transverse momenta of each one of them. The two-photon mechanism for pair production in colliding beam exeriments is considered. Through the use of mapped invariant integration variables, a reliable exact numerical calculation of the cross section for the production of muon and pion pairs by the two-photon mechanism is provided. Results are given for the exact total cross sections and also the differential cross sections with respect to the invariant mass squared of the pair. These are compared to the results obtained from the equivalent photon approximation method
Original Title
Parton model, total and differential cross sections, two-photon mechanism
Primary Subject
Source
1976; 124 p; University Microfilms Order No. 77-223.; Thesis (Ph. D.).
Record Type
Report
Literature Type
Thesis/Dissertation
Country of publication
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Bhattacharya, R.
International Union of Pure and Applied Physics1989
International Union of Pure and Applied Physics1989
AbstractAbstract
[en] Published in summary form only
Primary Subject
Source
1989; 1 p; International Nuclear Physics Conference; Sao Paulo, SP (Brazil); 20-26 Aug 1989
Record Type
Miscellaneous
Literature Type
Conference
Report Number
Country of publication
BARYONS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CATIONS, CHARGED PARTICLES, ELEMENTARY PARTICLES, ENERGY, EVALUATION, EVEN-EVEN NUCLEI, FERMIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INTERMEDIATE MASS NUCLEI, IONS, ISOTOPES, MATHEMATICAL MODELS, NUCLEAR MODELS, NUCLEAR POTENTIAL, NUCLEI, NUCLEONS, POTENTIALS, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, TIN ISOTOPES
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AbstractAbstract
[en] Positron lifetime and Moessbauer spectroscopic studies were carried out on MgMn0.1Fe1.9-xInxO4 spinel ferrite samples, both in bulk and nanocrystalline forms. The positron lifetimes at various substituted In3+ concentrations suggested changes in the predominant positron trapping sites. In the initial stage of substitution when In3+ ions were supposed to migrate to tetrahedral sites, many of these sites were left as vacancies and positrons were trapped in them. At higher concentrations of In3+, similar situation arises in the case of the octahedral sites. The same qualitative trend is observed when the sample is ball-milled to nanometre dimensions. Quantitatively, however, the measured positron lifetimes are larger than those for the bulk, signifying the annihilations at the grain surfaces and interfaces. From the Moessbauer studies, one observes changes in the electron density, electric field gradient and hyperfine field for nanoparticles in comparison to the bulk samples
Primary Subject
Secondary Subject
Source
S0375960104004748; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Country of publication
ALKALINE EARTH METAL COMPOUNDS, ANTILEPTONS, ANTIMATTER, ANTIPARTICLES, CHARGED PARTICLES, CRYSTAL DEFECTS, CRYSTAL STRUCTURE, ELEMENTARY PARTICLES, FERMIONS, FERRIMAGNETIC MATERIALS, INTERACTIONS, IONS, IRON COMPOUNDS, LEPTONS, MAGNETIC MATERIALS, MATERIALS, MATTER, MINERALS, OXIDE MINERALS, OXYGEN COMPOUNDS, PARTICLE INTERACTIONS, POINT DEFECTS, TRANSITION ELEMENT COMPOUNDS
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AbstractAbstract
[en] We have derived a scaled differential equation for the time evolution of the mean fragment size of a system undergoing multifragmentation. Conditions for stability and instability have been found. The scaling exponent for equilibrium is found to be related to the exponents that govern the temporal growth and fragmentation. The equilibrium mean size of the fragments formed and the characteristic relaxation time scale with the fusion breakup kernels. (orig.)
Primary Subject
Source
International workshop on dynamical fluctuations and correlations in nuclear collisions; Aussois (France); 16-20 Mar 1992
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Journal Article
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Conference
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AbstractAbstract
[en] Using the experimental occupation probabilities for the single particle states near the Fermi surface, the charge distribution of 54Fe, 58-64Ni and 64,66Zn have been calculated on the basis of an optimized one body potential. Excellent agreement with the experimental values have been found both in the case of single particle (-hole) energies and rms charge radii of the nuclei under consideration. Calculated values of Barrett moments and equivalent radii are in good agreement with the experiment. The details of the charge distributions have been evaluated by Fourier-Bessel analysis. (orig.)
Primary Subject
Secondary Subject
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Zeitschrift fuer Physik. A, Hadrons and Nuclei; ISSN 0939-7922; ; CODEN ZPAHEX; v. 351(2); p. 137-141
Country of publication
BESSEL FUNCTIONS, CENTRAL POTENTIAL, CHARGE DENSITY, D STATES, F STATES, FOURIER ANALYSIS, IRON 54, NICKEL 58, NICKEL 60, NICKEL 62, NICKEL 64, NICKEL ISOTOPES, NUCLEAR POTENTIAL, NUCLEAR RADII, NUCLEAR STRUCTURE, OCCUPATION NUMBER, P STATES, S STATES, SERIES EXPANSION, SPATIAL DISTRIBUTION, THEORETICAL DATA, ZINC 64, ZINC 66, ZINC ISOTOPES
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AbstractAbstract
[en] Magnetoresistance and the Hall coefficient of single crystals of bismuth doped with gallium and indium have been measured as functions of temperature between 80 and 300 K and as functions of magnetic field up to 0.6 T. An attempt has been made here to explain the observed temperature variations of the Hall coefficient and magnetoresistance at different constant magnetic fields by considering the relative variation of the free carrier concentrations with temperature in different bands in alloys of bismuth in addition to variation of other parameters. The calculations have been made on the basis of the ellipsoidal band model of bismuth
Source
S0921452602012103; Copyright (c) 2002 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Bhattacharya, R.
World congress on sustainable development: engineering and technological challenges of the 21st century2000
World congress on sustainable development: engineering and technological challenges of the 21st century2000
AbstractAbstract
[en] The mission of the Atomic Energy Regulatory Board (AERB), Mumbai is to ensure that the use of ionizing radiation and nuclear energy does not cause any undue risk to health, safety and environment. It gives the brief review of the safety aspects of Indian Nuclear Power Plants, Radioactive Waste Management, Safety Standards, Occupational exposure and dose limits. The article briefly reviews the principle approaches to environmental pollution control and waste management for the protection of environment
Primary Subject
Source
Institution of Engineers, Calcutta (India); 618 p; ISBN 0-07-463653-7; ; 2000; p. 114-117; 1. world congress on sustainable development: engineering and technological challenges of the 21st century; Calcutta (India); 20-23 Jan 2000
Record Type
Book
Literature Type
Conference
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AbstractAbstract
[en] A broad based fragmented pattern of the three 2h/sub 11/2/, 1j/sub 13/2/, and 1k/sub 17/2/ unbound shell-model neutron states in /sup 209/Pb has been obtained on the basis of the recent /sup 208/Pb(α,3He) reaction data. The present theoretical calculation shows that the shell-model energies of the three neutron states lie at 7.8 MeV excitation energy in /sup 209/Pb. The dilution of the neutron strengths of these three high spin states also indicates that the coupling of the neutron particle states with the 11 vibrational states of /sup 208/Pb is strong indeed. The theoretical results on the damping of the three neutron states are in sharp contrast with the existing theoretical results on the quasiparticle phonon coupling model calculation
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Secondary Subject
Record Type
Journal Article
Journal
Country of publication
BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, DIFFERENTIAL EQUATIONS, DIRECT REACTIONS, EQUATIONS, EVEN-ODD NUCLEI, EXCITED STATES, HEAVY NUCLEI, HELIUM ISOTOPES, HOURS LIVING RADIOISOTOPES, ISOTOPES, LEAD ISOTOPES, LIGHT NUCLEI, MATHEMATICAL MODELS, MATHEMATICAL OPERATORS, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEI, PARTIAL DIFFERENTIAL EQUATIONS, QUANTUM OPERATORS, RADIOISOTOPES, RESONANCE, STABLE ISOTOPES, TARGETS, TRANSFER REACTIONS, WAVE EQUATIONS
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AbstractAbstract
[en] Isotopic variation of rms charge radii of even isotopes of tin (112-124) has been calculated on the basis of an average one body potential. The potential parameters were optimized in the lead region after taking the effect of core polarisation into consideration. The optimized potential parameters were then interpolated in the tin region. Single particle (-hole) energies along with the orbit radius have also been calculated. Comparison with experimental results show very good agreement. The calculated charge distributions after the usual corrections were subjected to model independent Fourier-Bessel analysis from where Fourier-Bessel coefficients have been extracted. Results of rms charge radii show that this phenomenological approach gives a very good description of the experimental situation. (orig.)
Primary Subject
Secondary Subject
Record Type
Journal Article
Literature Type
Numerical Data
Journal
Zeitschrift fuer Physik. A, Hadrons and Nuclei; ISSN 0939-7922; ; CODEN ZPAHEX; v. 349(2); p. 101-104
Country of publication
BESSEL FUNCTIONS, CENTRAL POTENTIAL, CHARGE DENSITY, FOURIER ANALYSIS, INTERPOLATION, L-S COUPLING, NUCLEAR ALIGNMENT, NUCLEAR RADII, NUCLEAR STRUCTURE, OPTIMIZATION, PARTICLE-HOLE MODEL, THEORETICAL DATA, TIN 112, TIN 114, TIN 116, TIN 118, TIN 120, TIN 122, TIN 124, TIN ISOTOPES, WOODS-SAXON POTENTIAL
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Bhattacharya, R.
Proceedings of the international thorium energy conference: gateway to thorium energy2015
Proceedings of the international thorium energy conference: gateway to thorium energy2015
AbstractAbstract
[en] On account of limited uranium and vast thorium resources, India has adopted a three stage nuclear energy programme wherein initially the existing uranium reserves shall be explored and at later stages the thorium reserves shall be utilized for nuclear power production. Thorium occurs in nature as mineral monazite, which along with other heavy minerals, is found abundantly in the beach sands along the coastal stretches of peninsular India. Recovery of thorium therefore involves mining of beach sands, mineral separation to obtain monazite and its chemical processing to obtain thorium values. The process for recovery of thorium involve both radiological as well as conventional hazards. This paper highlight's the issues related to Radiological Hazards, Conventional Hazards, Waste Management and Regulatory Control. The radiological safety provisions in the thorium mining and milling as well as the industrial and fire safety aspects in thorium milling are enforced by the Atomic Energy Regulatory Board (AERB), which is the national regulatory body of India for nuclear and radiation safety. AERB's regulatory oversight span through all consenting stages namely, siting, construction, commissioning, operation and decommissioning. AERB is supported in its work by elaborate committee structure and follows a multi-tier review system of safety committees to carry out review and assessment. The individual doses in thorium mining and milling facilities as well to those of public residing in vicinity of these facilities is well within the specified limits. Industrial and fire safety statistics in thorium mills are also better when compared to similar conventional industries
Primary Subject
Source
Bhabha Atomic Research Centre, Mumbai (India); International Thorium Energy Organisation, Geneva (Switzerland); Nuclear Power Corporation of India Ltd., Mumbai (India); Homi Bhabha National Institute, Mumbai (India); [637 p.]; 2015; 3 p; ThEC15: international thorium energy conference: gateway to thorium energy; Mumbai (India); 12-15 Oct 2015
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Book
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Conference
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