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Shell-model calculations for the energy levels of the N=50 isotones with A=80–87

Ji, Xiangdong and Wildenthal, B. H. (1989) Shell-model calculations for the energy levels of the N=50 isotones with A=80–87. Physical Review C, 40 (1). pp. 389-398. ISSN 0556-2813. doi:10.1103/PhysRevC.40.389.

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The detailed features of the calculated energy-level schemes and of the single-particle, orbit-occupancy properties of the low-lying levels of the N=50 isotones 80Zn, 81Ga, 82Ge, 83As, 84Se, 85Br, 86Kr, and 87Rb are presented and discussed. These results are obtained with a new effective Hamiltonian operator obtained empirically from an iterative fit to experimental energies taken from all experimentally studied (A=82–96) N=50 nuclei. The model space for the calculations consists of active 0f5/2, 1p3/2, 1p1/2, and 0g9/2 proton orbits relative to a nominal 78Ni core. This space is truncated internally by restricting the number of particles excited from the negative-parity orbits into the g9/2 orbit to be no greater than four. The typical structures predicted for these lighter N=50 isotones are found to be dominated by well-mixed combinations of fp-orbit configurations, with the g9/2 orbit playing a minor role in all but a few special cases. The model energy-level spectra are compared with existing experimental information, as are calculated spectroscopic factors for single-proton stripping and pickup reactions.

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Additional Information:©1989 The American Physical Society Received 20 December 1988 This work is based on the thesis of Xiangdong Ji, submitted to Drexel University in partial fulfillment of the requirements of the PhD degree. It was supported in part by National Science Foundation, Grant Nos. PHY87-18772 and PHY83-12245. One of the authors (B.H.W.) acknowledges with appreciation the hospitality of Los Alamos National Laboratory (MPDO).
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Deposited On:11 Dec 2006
Last Modified:08 Nov 2021 20:34

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