A P Sharma
Articles written in Pramana – Journal of Physics
Volume 1 Issue 4 October 1973 pp 196-203 Nuclear And Particle Physics
The values in the range of 10−15 cm2 to 10−14 cm2 have been reported by various authors for the capture cross-section of electrons at the traps in silver bromide grains. In this paper we have given a suitable value of this cross-section which is used for computing the track characteristics in nuclear emulsions (e.g. effective ionization, probability of development, grain density and mean gap length) and the ratio of the rate constant of recombination and trapping. Theoretical results agree well with the experimental observations and the available data of other workers and give a convincing support to our choice of this cross-section parameter.
Volume 6 Issue 6 June 1976 pp 368-372 Solids
A comment on the number of sensitivity centres in silver halide grains of nuclear emulsions is made and a theory for its evaluation at different temperatures is presented. The results at room temperature agree satisfactorily with assumptions made by various workers.
Volume 7 Issue 4 October 1976 pp 255-265 Solids
This theoretical study summarizes ionic and electronic processes in AgBr crystals and the influence of its results on photographic process. It deals with the importance of surface generated interstitials which Gurney and Mott left untouched because of the non-availability of sufficient data at that time. The magnitude of various parameters,
Volume 11 Issue 4 October 1978 pp 479-489 Nuclear And Particle Physics
The pseudo-rapidity distribution has been studied for 50 GeV/c
Volume 13 Issue 1 July 1979 pp 25-30 solids
Temperature dependence of sensitivity of silver halide micro-crystals is theoretically examined for a wide range of momenta and charges of ionising particles. Our earlier results on the ionisation theory have now been extended for the interaction of multiple-charged particles with AgBr emulsion grains.
Volume 15 Issue 3 September 1980 pp 309-326 Particle Physics
The momenta and rapidity characteristics of the particles produced in 50 GeV/
Volume 20 Issue 4 April 1983 pp 287-292 Nuclear Physics
A study is made for the search of superheavy nuclei in Marjalahti, Eagle Station and in other pallasite olivines. The olivine crystals are calibrated for heavy ion track lengths by using heavy ion beams from cyclotrons. The calibration for ultra heavy ions which are presently not available with sufficient energy to produce volume tracks in olivine crystals, is based on Katz and Kobetich model of track formation. The length spectrum of volume tracks, revealed by puncturing them with focussed Nd-glass laser beam, is measured and the abundances of different nuclei groups are calculated. Partial annealing has been used at 430°C for 32 hr which eliminates the interfering tracks due to nuclei of atomic number
Volume 20 Issue 6 June 1983 pp 559-567 Nuclear Instrumentation
An attempt is made to determine the response of CR-39 and cellulose nitrate plastic track detectors subjected to thermal neutrons. The α-particles are produced from (
Volume 21 Issue 5 November 1983 pp 323-328 Nuclear And Particle Physics
Sample of cellulose nitrate (Russian) is exposed to1840Ar ions. The bulk etch rate has been studied at different etching temperatures and the activation energy for bulk etch rate has been calculated. The etched track lengths are measured for different etching times. The energy loss rate and range of1840Ar ions in CN(R) is also calculated. The critical threshold value for etchable track in CN(R) is determined by comparing the theoretical and experimental values of track length. The response curve of CN(R) is also presented.
Volume 21 Issue 5 November 1983 pp 339-345 Nuclear And Particle Physics
Makrofol polycarbonate plastic track detectors have been exposed to54132Xe -ions of energy 1.1 MeV/N from the cyclotron beam. The bulk etch rate and track etch rate are measured for different temperatures and the activation energies are calculated. The maximum etched track length is compared with the theoretically computed range. The critical energy loss is (d
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