Experimental study of two-proton correlated emission from 29S excited states

被引：42
|
作者：
Lin, C. J. [1 ]
Xu, X. X. [1 ]
Jia, H. M. [1 ]
Yang, F. [1 ]
Jia, F. [1 ]
Zhang, S. T. [1 ]
Liu, Z. H. [1 ]
Zhang, H. Q. [1 ]
Xu, H. S. [2 ]
Sun, Z. Y. [2 ]
Wang, J. S. [2 ]
Hu, Z. G. [2 ]
Wang, M. [2 ]
Chen, R. F. [2 ]
Zhang, X. Y. [2 ]
Li, C. [2 ]
Lei, X. G. [2 ]
Xu, Z. G. [2 ]
Xiao, G. Q. [2 ]
Zhan, W. L. [2 ]
机构：
[1] China Inst Atom Energy, Beijing 102413, Peoples R China
[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou 73000, Peoples R China
来源：
PHYSICAL REVIEW C | 2009年 / 80卷 / 01期
基金：
中国国家自然科学基金;
关键词：
PROTON; DECAY; HALO; RADIOACTIVITY; EXCITATION; ISOTOPES; NUCLEI;
D O I：
10.1103/PhysRevC.80.014310
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
An experiment of a S-29 beam bombarding a Au-197 target at an energy of 49.2 MeV/u has been performed to study the two-proton correlated emission from S-29 excited states. Complete-kinematics measurements were carried out in the experiment. The relative momentum, opening angle, and relative energy of two protons, as well as the invariant mass of the final system, were deduced by relativistic-kinematics reconstruction. The Si-27-p-p coincident events were picked out under strict conditions and the phenomenon of p-p correlations was observed among these events. The mechanisms of two-proton emission were analyzed in a simple schematic model, in which the extreme decay modes like He-2 cluster emission, three-body phase-space decay, and two-body sequential emission were taken into account. Associated with the Monte Carlo simulations, the present results show that two protons emitted from the excited states between 9.6 MeV and 10.4 MeV exhibit the features of He-2 cluster decay with a branching ratio of 29(-11)(+10)%.
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页数：8
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