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Shell-model studies of negative-parity states in nuclei with A=18, 19 and 20

1982; IOP Publishing; Volume: 8; Issue: 2 Linguagem: Inglês

10.1088/0305-4616/8/2/011

2057-763X

M. M. King Yen, S. T. Hsieh, H. C. Chiang, Der-San Chuu,

Atomic and Molecular Physics

A shell-model calculation of the negative-parity states in the A=18, 19 and 20 nuclei is presented. Assuming the nucleus 16O to be the core, an active hole is restricted to the 1p1/2 or 1p3/2 orbits, and active particles are allowed to occupy the 1d5/2 and 2s1/2 orbits. The two-body effective interaction is assumed to be a central potential which has Yukawa radial dependence. The energy spectra are calculated from a least-squares fit to the experimental data, varying the strengths of the exchange interaction and the single-particle level splittings. Spectroscopic factors and E2, E3 and M1 transition rates are calculated and compared with the observed values.