Possible Experimental Evidence of a Moderate Proton Halo in 29S
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LIU Zu-Hua,
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RUAN Ming,
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ZHAO Yao-Lin,
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ZHANG Huan-Qiao,
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YANG Feng,
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MA Zhong-Yu,
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LIN Cheng-Jian,
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CHEN Bao-Qiu,
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WU Yue-Wei,
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ZHAN Wen-Long,
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GUO Zhong-Yan,
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XIAO Guo-Qing,
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XU Hu-Shan,
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SUN Zhi-Yu,
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LI Jia-Xing,
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CHEN Zhi-Qiang
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Abstract
The total reaction cross sections (TRCSs) of 29S+28Si have been measured at intermediate energies. An obvious enhancement in TRCS of 29S is observed as compared with its neighbouring nuclei. The TRCSs of 29S+28Si are calculated with the modified Glauber theory in the optical limit and few-body approaches. The different factor d as a possible measure of halo appearance is deduced from the experimental and theoretical data. It is well accepted that 27P is a proton halo nucleus. Although not as anomalous as 27P, the different factor d of 29S is obviously larger than that of its neighbouring isotones of N=13. This result indicates that a moderate proton halo may exist in 29S nucleus. We calculate the total reaction cross sections for 29S with the modified Glauber theory as a function of incident energy and compare the results with those for 27Si which is a core nucleus of 29S. The measured TRCSs of 27Si+28Si can be described to be satisfactory by the modified Glauber theory of the optical limit approach. Although a diffused nuclear density distribution is used, the theories still inadequately predict the experimental TRCSs of 29S+28Si, which further indicates the possibility of proton halo in29S.
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