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arXiv 1803.07656nucl-th
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$^{67}$ Kr令人困惑的双质子衰变

The puzzling two-proton decay of $^{67}$Kr

S. M. Wang, W. Nazarewicz

摘要:

双质子(2 $p$)放射性是一种罕见的衰变模式,发现在一些质子游离核。发射质子的$2p$ -衰变寿命和性质在低位质子连续体的存在下携带关于原子核结构的宝贵信息。最近测量的$^{67}$ Kr的$2p$衰变[Phys. Rev. Lett. 117,162501(2016)]原来是出乎意料的快。由于$^{67}$ Kr预计是一个变形的系统,我们调查的影响变形效应的$2p$放射性。我们应用最近开发的伽莫夫耦合通道框架,它允许在旋转和振动耦合的存在下的三体系统的精确描述。这是三体方法首次应用于变形核的双核子衰变。我们发现,变形耦合显着增加的$2p$衰减宽度的$^{67}$氪,这一发现解释了令人困惑的实验数据。计算的质子-质子角关联反映了该核中$1p$和$2p$衰变模式之间的竞争。

英文摘要:

Two-proton (2$p$) radioactivity is a rare decay mode found in a few proton-unbound nuclei. The $2p$-decay lifetime and properties of emitted protons carry invaluable information on nuclear structure in the presence of low-lying proton continuum. The recently measured $2p$ decay of $^{67}$Kr [Phys. Rev. Lett. 117, 162501 (2016)] turned out to be unexpectedly fast. Since $^{67}$Kr is expected to be a deformed system, we investigate the impact of deformation effects on the $2p$ radioactivity. We apply the recently developed Gamow coupled-channel framework, which allows for a precise description of three-body systems in the presence of rotational and vibrational couplings. This is the first application of a three-body approach to a two-nucleon decay from a deformed nucleus. We show that deformation couplings significantly increase the $2p$ decay width of $^{67}$Kr; this finding explains the puzzling experimental data. The calculated angular proton-proton correlations reflect a competition between $1p$ and $2p$ decay modes in this nucleus.

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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