arXiv 2108.080072021-08-18nucl-thnucl-ex

极端氧同位素中的核子-核子关联

Nucleon-nucleon correlations in the extreme oxygen isotopes

S. M. Wang, W. Nazarewicz, R. J. Charity, L. G. Sobotka

备注：: 7 pages, 4 figures. arXiv admin note: text overlap with arXiv:2104.03195
DOI：: 10.1088/1361-6471/ac888f

摘要：

由于核子-核子关联的研究，人们对双核子衰变的兴趣高涨。在我们以前的工作中，基于一种新的含时三体方法，我们证明了发射核子的能量和角关联可以揭示核内形成的核子对的结构。在本工作中，我们应用这个新框架研究了一些极端丰质子和丰中子氧同位素的衰变动力学和性质，包括$^{11,12}$ O的双质子（$2p$）衰变和$^{26}$ O的双中子（$2n$）衰变。在这里，我们表明，低$\ell$组件的$^{11,12}$ O波函数，这是连续和组态相互作用的影响，强烈影响衰减动力学和渐近相关性。在计算的$^{11,12}$ O的波函数中，双质子和雪茄状结构在隧穿过程中合并在一起，由此产生的能量和角关联与实验数据非常一致。当双中子衰变能量接近零能阈时，$^{26}$ O的$2n$衰变的渐近关联发生了显著的变化。小的报告值的$Q_{2n}$表明，该核的$2n$衰变可以理解的通用相空间限制。

英文摘要：

There has been an upsurge of interest in two-nucleon decays thanks to the studies of nucleon-nucleon correlations. In our previous work, based on a novel time-dependent three-body approach, we demonstrated that the energy and angular correlations of the emitted nucleons can shed light on the structure of nucleonic pairs formed inside the nucleus. In this work, we apply the new framework to study the decay dynamics and properties of some extreme proton-rich and neutron-rich oxygen isotopes, including two-proton ($2p$) decays of $^{11,12}$O and two-neutron ($2n$) decay of $^{26}$O. Here we show that the low-$\ell$ components of $^{11,12}$O wave functions, which are affected by continuum and configuration-interaction effects, strongly impact decay dynamics and asymptotic correlations. In the calculated wave functions of $^{11,12}$O, diproton and cigarlike structures merge together during the tunneling process and the resulting energy- and angular correlations are very consistent with the experimental data. The asymptotic correlations of the $2n$ decay of $^{26}$O dramatically change as the two-neutron decay energy approaches the zero-energy threshold. The small reported value of $Q_{2n}$ suggests that the $2n$ decay of this nucleus can be understood in terms of the universal phase-space limit.

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英文摘要：

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