| Possible Experimental Evidence of a Moderate Proton Halo in ^29S |
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| 作者姓名： | 刘祖华 阮明 赵耀林 张焕乔 杨峰 马中玉 林承键 陈宝秋 吴岳伟 詹文龙 郭忠言 肖国青 徐瑚珊 孙志宇 李加兴 陈志强 |
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| 作者单位： | [1]ChinaInstituteofAtomicEnergy,Beijing102413 [2]InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou730000 |
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| 摘 要： | 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 arecal culated 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 ~9S nucleus. We calculate the total reaction cross sections for ~9S with the modified Glaubertheory as a function of incident energy and compare the results with those for 2rSi which is a core nucleus 0f29S.The measured TRCSs of 27Si4-2SSi can be described to be satisfactory by the modified Glauber theory of theoptical limit approach. Although a diffused nuclear density distribution is used, the theories still inadequatelypredict the experimental TRCSs of 29S4-2SSi, which further indicates the possibility of proton halo in 29S.
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| 关 键 词： | 质子晕圈 原子核物理 硫原子 反应截面 Glauber理论 |
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