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arXiv 2007.04105nucl-th
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Cd,Sn和Te同位素第一激发态$2^+$和$3^-$的统一观点

A unified view of the first-excited $2^+$ and $3^-$ states of Cd, Sn and Te isotopes

Bhoomika Maheshwari

摘要:

对称性在Sn同位素的低能级结构中起着重要的作用,主要体现在资历和广义资历方案中。在本文中,我们重新审查的多j广义资历方法的第一激发态的$2^+$和$3^-$在Cd($Z=48$),Sn($Z=50$)和Te($Z=52$)同位素,其中Cd和Te同位素代表两个质子空穴和两个质子粒子核,从而涉及两种粒子(质子和中子)相比,Sn同位素。有趣的是,基于中子价空间的方法是能够解释的B(E2)和B(E3)的趋势分别为$2^+$和$3^-$在所有三个镉,锡和碲同位素的状态。用广义的资历方案,以与Sn同位素相同的方式理解Cd和Te同位素中B(E3)值的倒抛物线行为的新结果。这些计算不支持壳层猝灭;因此,中子幻数,$N=50$和$N=82$,在这些同位素链中保持稳健。令人惊讶的是,广义的资历在远离半魔区域的情况下仍然相当成功,从而提供了对$2^+$和$3^-$状态的统一看法。

英文摘要:

Symmetries are known to play an important role in the low lying level structure of Sn isotopes, mostly in terms of the seniority and generalized seniority schemes. In this paper, we revisit the multi-j generalized seniority approach for the first excited $2^+$ and $3^-$ states in the Cd ($Z=48$), Sn ($Z=50$) and Te ($Z=52$) isotopes, where the Cd and Te isotopes represent two-proton hole and two-proton particle nuclei, thus involving both kind of particles (protons and neutrons) in contrast to Sn isotopes. Interestingly, the approach based on neutron valence space alone is able to explain the B(E2) and B(E3) trends respectively for the $2^+$ and $3^-$ states in all the three Cd, Sn and Te isotopes. The new results on the inverted parabolic behavior of B(E3) values in Cd and Te isotopes are understood in a manner identical to that of Sn isotopes by using the generalized seniority scheme. No shell quenching is supported by these calculations; hence, the neutron magic numbers, $N=50$ and $N=82$, remain robust in these isotopic chains. It is quite surprising that the generalized seniority continues to be reasonably successful away from the semi-magic region, thus providing a unifying view of the $2^+$ and $3^-$ states.

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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