Shell model study of the high spin states in the {ital N}=50 isotones {sup 92}Mo, {sup 93}Tc, {sup 94}Ru, and {sup 95}Rh
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
- Nuclear Science Center, Aruna Asaf Ali Marg, P.O. Box 10502, New Delhi 110 067 (India)
The low lying levels in {ital N}=50 isotones have been well described within the shell model framework. These calculations were performed assuming an inert neutron core and the valence protons occupying either the ({ital p}{sub 1/2},{ital g}{sub 9/2}) or ({ital f}{sub 5/2},{ital p}{sub 3/2},{ital p}{sub 1/2},{ital g}{sub 9/2}) orbits. With the advent of multidetector arrays the level schemes of these nuclei have been extended to high spin regimes ({ital J}=20{minus}25{h_bar}). The inclusion of neutron core excitation (neutron particle-hole excitation across the {ital N}=50 shell gap) was essential to adequately describe these observed higher angular momentum states. Calculations involving neutron particle-hole excitation across the {ital N}=50 shell gap, coupled to the lower valence proton configurations, were not feasible due to computational limitations. This paper describes a truncation scheme devised to perform large basis shell model calculations. The level sequences observed in the {ital N}=50 isotones {sup 92}Mo, {sup 93}Tc, {sup 94}Ru, and {sup 95}Rh are interpreted on the basis of the shell model calculations in the configuration space {ital f}{sub 5/2}, {ital p}{sub 3/2}, {ital p}{sub 1/2}, {ital g}{sub 9/2} for the protons and {ital p}{sub 1/2}, {ital g}{sub 9/2}, {ital g}{sub 7/2}, {ital d}{sub 5/2}, {ital d}{sub 3/2}, {ital s}{sub 1/2} for the neutrons. The excitation of a {ital g}{sub 9/2} neutron across the {ital N}=50 shell, into the next major oscillator shell describes the observed higher angular momentum states in these nuclei.
- OSTI ID:
- 118486
- Journal Information:
- Physical Review, C, Journal Name: Physical Review, C Journal Issue: 4 Vol. 52; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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