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arXiv 1909.05092nucl-th
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2 p1 f壳层中等势线和等矢量配对对核Gamow-Teller跃迁的影响:壳层模型研究

Influence of isoscalar and isovector pairing on Gamow-Teller transitions for nuclei in the 2p1f shell: A schematic shell model study

A. Carranza M., S. Pittel, Jorge G. Hirsch

摘要:

本文利用具有两个示意性哈密顿量的核壳模型,对2 p1 f壳层中的Gamow-Teller(GT)跃迁进行了系统的研究。壳模型的使用提供了灵活性,以分析不同的质子-中子配对模式在核变形的存在下的作用。所使用的示意性哈密顿量包含四极-四极相互作用以及等oscillation(T=0)和等矢量(T=1)配对相互作用,但在单粒子能量上不同。本工作的目的是观察GT跃迁在不同的等密度和等矢量配对情况下的行为,以及相应的母核和子核(42 Ca-> 42 Sc,44 Ca-> 44 Sc,46 Ti-> 46 V,48 Ti-> 48 V)的能谱和转动性质。我们还讨论了44 Ti和48 Cr的转动特性。所有结果与实验数据进行了比较。从我们的模型中获得的结果取决于不同的情况下出现的,无论是N = Z或N neq Z核。在后一种情况下,一个有吸引力的isoscope配对相互作用的存在强加了一个1+基态的奇-奇核,相反的观察一些核考虑,它是必要的,以抑制这种配对模式时,考虑这样的核。改变两种配对模式的强度参数的效果被发现表现出不同的,但系统的影响能谱和GT过渡特性。

英文摘要:

We perform a systematic study of Gamow-Teller (GT) transitions in the 2p1f shell, using the nuclear shell model with two schematic Hamiltonians. The use of the shell model provides flexibility to analyze the role of different proton-neutron pairing modes in the presence of nuclear deformation. The schematic Hamiltonians that are used contain a quadrupole-quadrupole interaction as well as isoscalar (T=0) and isovector (T=1) pairing interactions, but differ in the single particle energies. The objective of the work is to observe the behavior of GT transitions in different isoscalar and isovector pairing scenarios, together with the corresponding energy spectra and rotational properties of the parent and daughter nuclei (42Ca -> 42Sc, 44Ca -> 44Sc, 46Ti -> 46V, 48Ti -> 48V). We also treat the rotational properties of 44Ti and 48Cr. All results are compared with experimental data. The results obtained from our models depend on the different scenarios that arise, whether for N = Z or N neq Z nuclei. In the latter case, the presence of an attractive isoscalar pairing interaction imposes a 1+ ground state in odd-odd nuclei, contrary to observations for some of the nuclei considered, and it is necessary to suppress that pairing mode when considering such nuclei. The effect of varying the strength parameters for the two pairing modes is found to exhibit different but systematic effects on energy spectra and on GT transition properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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