Ram Raj

Nuclear energy levels of 51V and 59Ni

Abstract The reaction matrix elements of Kuo and Brown are tested by calculating the nuclear energy levels of 51 V and 59 Ni. Good agreement between calculated and experimental energies is obtained for 51 V. For 59 Ni, the agreement is unsatisfactory but shows a little bit of improvement over the previously published theoretical results.

Charge form factor of the alpha particle

Abstract Employing a wave function of the alpha particle ( 4 He), containing a mixture of 1 S 0 and the principal 5 D 0 states, an analytical expression for the charge form factor F E ( q 2 ) is calculated. The theoretical values of F E ( q 2 ) are compared with those obtained from electron-helium scattering experiments. Though the wave function employed in the calculation gave good fits to the binding energy bremsstrahlung-weighted and integrated cross sections for the photo- disintegration of helium it failed to give agreement with F E ( q 2 ).

Monte Carlo calculation of electron spectra produced in water phantoms by 20 keV-1 GeV photons

Abstract A Monte Carlo calculation for the energy spectra of electrons and positrons produced in infinite and semiinfinite water phantoms by photons ranging in energies from 20 keV to 1 GeV are presented. The dominant processes considered are the photoelectric effect, Auger effect, Compton effect, pair, and triplet production. Bremsstrahlung produced by electrons and positrons with energies greater than 1 MeV is also included. The effect of multiple Compton scattering, not considered in the earlier calculation, for the infinite phantom for photon energies higher than 2 MeV has been incorporated. For a semi-infinite phantom, multiple Compton scattering and backscattering through the top are considered. The results are compared with the earlier calculations for the first-collision spectrum. It is found that the inclusion of multiple Compton scattering significantly increases the average number of electrons/cm3 per photon/cm2 at all energies considered whereas bremsstrahlung reduces the number of high energy...

Modified Tamm-Dancoff approximation calculations using Lipkin-Nogami approach

The number conservation as introduced by Lipkin and Nogami has been incorporated in the modified Tamm-Dancoff approximation method. The necessary relevant formulas arising due to this modification are derived and applied to the even Ni isotopes employing the Kuo-Brown effective interaction. A general improvement in agreement with experiments is obtained.

M1 and E2 transitions in 59Ni

Abstract Employing the Kuo-Brown interaction, M1 and E2 transition rates for the low-lying levels of 59 Ni are calculated and the results are found to be in reasonably good agreement with the observed values.