Microscopic Calculations for Waiting-Point Nuclei

Abstract

Abstract. Shell-model calculations for upper fp-shell nuclei using realistic interactions are reported. Valence nucleons beyond the N=28=Z core are considered to fill levels of the normal parity upper fp-shell and the unique parity configurations that consists either of the g 9/2 level or the whole gds-shell. These two cases are handled within a standard M-scheme approach and an SU(3) picture, respectively. Results for low-lying energy spectra, single-particle occupancies and symmetry properties of the eigenstates are reported. Various truncations are considered that key on the number of nucleon pairs allowed to occupy the unique-parity space. The calculations demonstrate the importance of the unique-parity space to the structure of upper fp-shell nuclei.

Deformed shell model study of heavy N=Z nuclei and dark matter detection

“…They are: (i) analysis of recent data on low-lying T = 1 and T = 0 bands in the heavy N=Z nucleus 66 As; (ii) detections rates for the light supersymmetric particle, a dark matter candidate, with 73 Ge as the detector. In future heavy N=Z nuclei will be further analyzed to bring out isoscalar pairing vs isovector pairing in these nuclei by using extended pairing plus quadrupole-quadrupole Hamiltonian of the Sofia group [32] and comparing the results of DSM obtained with this interaction with those using realistic interactions. In addition, in the topic of dark matter, DSM will be employed to study inelastic (spin dependent) WIMP-nucleus scattering in 83 Kr and this is unlike LSP that involves only elastic scattering.…”