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arXiv 1805.06136nucl-th
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Gamow-Teller跃迁中的等标中子-质子配对和SU(4)对称性破缺

Isoscalar neutron-proton pairing and SU(4)-symmetry breaking in Gamow-Teller transitions

K. Kaneko, Y. Sun, T. Mizusaki

摘要:

等压线中子-质子配对被认为对质子数和中子数相等的原子核很重要,但它在结构性质上的表现仍有待理解。本文用大尺度壳模型方法研究了f7/2壳层核的Gamow-Teller(GT)跃迁。结果表明,在42 Sc中,T=0,J=1+的等轨道中子-质子对相互作用对第一激发态1+ GT强度的集中起决定性作用,而在46 V,50 Mn和54 Co中,这些GT强度的抑制主要是由自旋-轨道力和四极-四极相互作用的补充引起的.基于电荷交换反应数据的良好再现性,我们进一步分析了Isoscope和Isovector配对相关性之间的相互作用。我们的结论是,即使对于最有希望的A=42的核,其中SU(4)的等标度-等矢量配对对称性较少破缺,形成等标度的中子-质子配对凝聚的概率小于60%相比,在SU(4)对称性限制的预期。

英文摘要:

The isoscalar neutron-proton pairing is thought to be important for nuclei with equal number of protons and neutrons but its manifestation in structure properties remains to be understood. We investigate the Gamow-Teller (GT) transitions for the f7/2-shell nuclei in large-scale shell-model calculations with the realistic Hamiltonian. We show that the isoscalar T=0, J=1+ neutron-proton pairing interaction plays a decisive role for the concentration of GT strengths at the first-excited 1+ state in 42Sc, and that the suppression of these strengths in 46V, 50Mn, and 54Co is mainly caused by the spin-orbit force supplemented by the quadrupole-quadrupole interaction. Based on the good reproduction of the charge-exchange reaction data, we further analyze the interplay between the isoscalar and isovector pairing correlations. We conclude that even for the most promising A=42 nuclei where the SU(4) isoscalar-isovector-pairing symmetry is less broken, the probability of forming an isoscalar neutron-proton pairing condensation is less than 60% as compared to the expectation at the SU(4)-symmetry limit.

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