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

M. Sambataro and N. Sandulescu
Phys. Rev. C 91, 064318 – Published 26 June 2015

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 Cd96 and Pd92. 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 0g9/2 space to the more complete 1p1/2,1p3/2,0f5/2,0g9/2 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 Pd92.

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  • Received 14 May 2015

DOI:https://doi.org/10.1103/PhysRevC.91.064318

©2015 American Physical Society

Authors & Affiliations

M. Sambataro1 and N. Sandulescu2

  • 1Istituto Nazionale di Fisica Nucleare - Sezione di Catania, Via S. Sofia 64, I-95123 Catania, Italy
  • 2National Institute of Physics and Nuclear Engineering, P.O. Box MG-6, Magurele, Bucharest, Romania

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Vol. 91, Iss. 6 — June 2015

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