Structure and 2p decay mechanism of^(18)Mg  

作　　者：Long Zhou De-Qing Fang Si-Min Wang Hui Hua 

机构地区：[1]Key Laboratory of Nuclear Physics and Ion-beam Application(MOE),Institute of Modern Physics,Fudan University,Shanghai 200433,China [2]Shanghai Research Center for Theoretical Nuclear Physics,NSFC and Fudan University,Shanghai 200438,China [3]School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China

出　　处：《Nuclear Science and Techniques》2024年第6期145-154,共10页核技术（英文）

基　　金：the National Key Research and Development Program(MOST 2022YFA1602303 and MOST 2023YFA1606404);the National Natural Science Foundation of China(Nos.12347106,2147101,11925502,11935001 and 11961141003);the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB34030000).

摘　　要：The recently discovered,extremely proton-rich nuclide 18 Mg 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^(18)Mgby 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^(18)Mgis significantly influenced by the continuum,resulting in a significant s-wave component.However,based on the current framework,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^(18)Mgground 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.

关 键 词：Structure of^(18)Mg Two-proton decay Proton-proton correlation 

分 类 号：O571[理学—粒子物理与原子核物理]