1. Correlations of two protons emitted from excited states of 28S and 27P
- Author
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Peng Ma, Guoqing Xiao, S. Z. Chen, J. B. Ma, Z.D. Wu, Xiangguo Lei, J.L. Han, F. Yang, L. Yang, H.M. Jia, Li-Jie Sun, Cheng-Jian Lin, Xiaojuan Zhou, Min Wang, Z. H. Liu, Mei Huang, Shi-Lun Jin, H. S. Xu, X. X. Xu, Huanqiao Zhang, Xinwen Ma, Z.G. Hu, Youhua Yang, Jian-Song Wang, P.F. Bao, Y. H. Zhang, Zhili Sun, and Na Zhang
- Subjects
Physics ,Nuclear and High Energy Physics ,Proton ,Branching fraction ,Monte Carlo method ,Nuclear Theory ,medicine.anatomical_structure ,Coincident ,Phase space ,Excited state ,medicine ,Halo ,Atomic physics ,Nuclear Experiment ,Nucleus - Abstract
A contrastive research on two-proton (2p) emissions from excited states of the even-Z nucleus 28S and its one-proton daughter, the odd-Z nucleus 27P was performed by complete-kinematics measurements. The opening angles as well as relative momenta between two emitted protons and invariant masses of decaying systems were reconstructed through the event-by-event analysis of heavy fragments coincident with two protons. With the help of Monte Carlo simulations, results show a diproton-type decay with the branching ratio of 20 − 7 + 6 % for 28S while mainly three-body simultaneous decay in the phase space and/or 2p sequential emission for 27P. Present results show that the diproton correlations may result from the proton configuration in the initial state like 2p skin/halo structure rather than the deformed orbit.
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