Quarteting and spin-aligned proton-neutron pairs in heavy N=Z nuclei

2015/05/14 by M. Sambataro, Sambataro, M., N. Sandulescu +1
Physics and Astronomy · #Nuclear physics research studies #Quantum chaos and dynamical systems #Quantum, superfluid, helium dynamics #nucl-th

paper · pdf · doi:10.48550/arxiv.1505.03751

6 pages, 6 figures

arxiv created 2015/05/14 · arxiv updated 2015/05/15

Abstract

We analyze the role of maximally aligned isoscalar pairs in heavy N=Z nuclei by employing a formalism of quartets. Quartets are superpositions of two neutrons and two protons coupled to total isospin T=0 and given J. The study is focused on the contribution of spin-aligned pairs carrying the angular momentum J=9 to the structure of ⁹⁶Cd and ⁹²Pd. We show that the role played by the J=9 pairs is quite sensitive to the model space and, in particular, it decreases considerably by passing from the simple 0g_9/2 space to the more complete 1p_1/2,1p_3/2,0f_5/2,0g_9/2 space. In the latter case the description of these nuclei in terms of only spin-aligned J=9 pairs turns out to be unsatisfactory while an important contribution, particularly in the ground state, is seen to arise from isovector J=0 and isoscalar J=1 pairs. Thus, contrary to previous studies, we find no compelling evidence of a spin-aligned pairing phase in ⁹²Pd.

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