Correlations of two protons emitted from excited states of 28S and 27P

Correlations of two protons emitted from excited states of 28S and 27P
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28S 和 27P 激发态发射的两个质子的相关性

DOI:
10.1016/j.physletb.2013.10.029
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发表时间:
2013-11
期刊:
影响因子:
4.4
通讯作者:
P.F. Bao
P.F. Bao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
X.W. Ma;G.Q. Xiao;H.M. Jia;F. Yang;H.Q. Zhang;Z.H. Liu;Z.D> Wu;L. Yang;P.F. Bao

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用全运动学方法对偶Z核28 S及其单质子子核27 P的激发态双质子发射进行了对比研究。通过对与两个质子重合的重碎片的逐事件分析,重建了两个质子和衰变系统不变质量之间的张角和相对动量。在蒙特卡罗模拟的帮助下,结果显示28 S的双质子型衰变的分支比为20 − 7 + 6%,而27 P的相空间主要是三体同时衰变和/或2p顺序发射。
A contrastive research on two-proton (2p) emissions from excited states of the even-Z nucleus 28 S and its one-proton daughter, the odd-Z nucleus 27 P 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 28 S while mainly three-body simultaneous decay in the phase space and/or 2p sequential emission for 27 P. 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.
DOI: 10.1103/physrevlett.81.5089
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