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Possible Experimental Evidence of a Moderate Proton Halo in 29S |
| LIU Zu-Hua1;RUAN Ming1;ZHAO Yao-Lin1;ZHANG Huan-Qiao1;YANG Feng1;MA Zhong-Yu1;LIN Cheng-Jian1;CHEN Bao-Qiu1; WU Yue-Wei1;ZHAN Wen-Long2;GUO Zhong-Yan2;XIAO Guo-Qing2;XU Hu-Shan2;SUN Zhi-Yu2;LI Jia-Xing2;CHEN Zhi-Qiang2 |
| 1China Institute of Atomic Energy, Beijing 102413
2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000 |
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| Cite this article: |
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LIU Zu-Hua, RUAN Ming, ZHAO Yao-Lin et al 2004 Chin. Phys. Lett. 21 1711-1713 |
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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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21.10.Ft
25.60.-t
25.60.Dz
27.30.+t
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Published: 01 September 2004
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