Competition of different coupling schemes in atomic nuclei

Abstract

Shell model calculations reveal that the ground and low-lying yrast states of the $N=Z$ nuclei ${}_{46}^{92}$Pd and ${}^{96}$Cd are mainly built upon isoscalar spin-aligned neutron-proton pairs each carrying the maximum angular momentum J=9 allowed by the shell $0g_{9/2}$ which is dominant in this nuclear region. This mode of excitation is unique in nuclei and indicates that the spin-aligned pair has to be considered as an essential building block in nuclear structure calculations. In this contribution we will discuss this neutron-proton pair coupling scheme in detail. In particular, we will explore the competition between the normal monopole pair coupling and the spin-aligned coupling schemes. Such a coupling may be useful in elucidating the structure properties of $N=Z$ and neighboring nuclei.

arXiv comment10 pages, 7 figures, 1 table. Proceedings of the Conference on Advanced Many-Body and Statistical Methods in Mesoscopic Systems, Constanta, Romania, June 27th - July 2nd 2011. To appear in Journal of Physics: Conference Series

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Cited by in corpus (4)

• Symplectic group structure of the 48Cr, 88Ru, and 92Pd ground states
• Cooperation of anti-aligning and aligning shell-model forces for N=Z
• Structure of the phonon vacuum state
• Partial conservation of seniority in semi-magic nuclei