N p N n systematics in heavy nuclei
198528 pages
Published in:
- Nucl.Phys.A 443 (1985) 1-28
- Published: 1985
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Abstract: (Elsevier)
The systematics of the nuclear phase transitional regions near A = 100, 130, 150 and 190 are studied from the standpoint of the valence nucleon product N p N n . The use of this construction or parametrization leads to a substantial simplification of these complex regions. The results are discussed in terms of the proton-neutron interaction in different shell-model orbits and are used to interpret the effects of subshell closures. The mechanism for the onset of deformation near A = 100, involving the eradication of such a subshell closure in one type of particle as a function of the number of valence nucleons of the other type, is shown to be of more general applicability, not only for the A = 150 region, but also for the A = 190 region. The N p N n plots for five mass regions ( A = 100, 130, 150 ( Z ⩽ 64), 150 ( Z ⩾ 66) and 190) are compared. It is found that the quantity N p N n provides an excellent unit to assess the rapidity of different transition regions: that is, the slopes of different observables plotted against this quantity are related to the average interaction strength, per proton-neutron pair, in the crucial highly overlapping orbits whose occupation induces the phase transition. The five regions studied are found to display a remarkable similarity which results from similar strengths of this interaction in the crucial orbits.References(41)
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