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Structure and 2p decay mechanism of $^{18}Mg$

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摘要: The recently discovered, extremely proton-rich nuclide 18Mg exhibits ground-state decay via two sequential two-proton (2p) emissions through the intermediate nucleus, 16Ne. This study investigates the structure and the initial 2p decay mechanism of 18Mg by examining the density and correlations of the valence protons using a three-body Gamow-coupled-channel method. The results show that the ground state of 18Mg is significantly influenced by the continuum, resulting in a significant s-wave component. However, based on the current frame- work, this does not lead to a significant deviation in mirror symmetry in either the structure or spectroscopy of the 18Mg-18C pair. Additionally, the time evolution analysis of the 18Mg ground state suggests a simultaneous 2p emission during the first step of decay. The observed nucleon–nucleon correlations align with those of the light–mass 2p emitters, indicating a consistent decay behavior within this nuclear region.

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[V1] 2024-05-24 16:02:03 ChinaXiv:202405.00317V1 下载全文
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