关键天体反应18Ne（α，p）21Na的实验研究

原子核物理评论 , 2013, (4): 385-390. doi: 10.11804/NuclPhysRev.30.04.385

关键天体反应18Ne（α，p）21Na的实验研究

张立勇 ^1, , 许世伟 ^2, , 何建军 ^3, , H. Yamaguchi ^4, , S. Kubono ^5, , Y. Wakabayashi ^6, , 陈思泽 ^7, , 胡钧 ^8, , 马朋 ^9, , Y. Togano ^10, , T. Hashimoto ^11, , D. Kahl ^12, , T. Teranishi ^13, , 陈若富 ^14, , 王宏伟 ^15, , 田文栋 ^16, , 郭冰 ^17, , S. Hayakawa ^18, , N. Iwasa ^19, , T. Yamada ^20, , T. Komatsubara ^21,

1.中国科学院近代物理研究所，甘肃兰州 730000; 兰州大学核科学与技术学院，甘肃兰州 730000; 中国科学院大学，北京 100049

2.中国科学院近代物理研究所,甘肃兰州,730000

3.中国科学院近代物理研究所,甘肃兰州,730000

4.Center for Nuclear Study CNS，University of Tokyo，Hirosawa 3510198 Japan

5.Center for Nuclear Study CNS，University of Tokyo，Hirosawa 3510198 Japan

6.Advanced Science Research Center JAEA，Tokai Ibaraki 3191195 Japan

7.中国科学院近代物理研究所，甘肃兰州 730000; 中国科学院大学，北京 100049

8.中国科学院近代物理研究所,甘肃兰州,730000

9.中国科学院近代物理研究所,甘肃兰州,730000

10.RIKEN，Hirosawa Wako Saitama 3510198 Japan

11.Center for Nuclear Study CNS，University of Tokyo，Hirosawa 3510198 Japan

12.Center for Nuclear Study CNS，University of Tokyo，Hirosawa 3510198 Japan

13.Department of Physics，University of Kyushu，Fukuoka 8128581 Japan

14.中国科学院近代物理研究所,甘肃兰州,730000

15.中国科学院上海应用物理研究所,上海,201800

16.中国科学院上海应用物理研究所,上海,201800

17.中国原子能科学研究院,北京,102413

18.Center for Nuclear Study CNS，University of Tokyo，Hirosawa 3510198 Japan

19.Department of Physics，University of Tohoku，Sendai 9808577 Japan

20.Department of Physics，University of Tohoku，Sendai 9808577 Japan

21.Department of Physics，University of Tsukuba，Tsukuba 3050006 Japan

基金项目: National Basic Research Program of China(973 Pro-gram)(2013CB834406) 国家自然基金资助项目(11135005,11021504)；国家重点基础研究发展计划项目(973计划)(2013CB834406)@@@@National Natural Science Foundation of China(11135005,11021504)

关键词：核天体物理 , X射线暴 , 放射性束 , 厚靶方法 , 共振散射

Experimental Study of Key 18Ne(α, p)21Na Astrophysical Reaction

Keywords： nuclear astrophysics , X-ray burst , radioactive beam , thick target method , resonant scattering

在X射线暴高温高密度的环境中，18Ne(α, p)21Na很可能是由热CNO循环突破到rp过程的一个重要反应。到目前为止，人们测得的反应率还存在很大的不确定性。实验中用CRIB(CNS Radioactive Ion Beam separator)提供的21Na放射性束轰击8.8 mg/cm2的聚乙烯厚靶，利用放置在θlab=-14°，0°，14°处的3套硅条探测器望远镜阵列对反冲轻粒子进行鉴别和测量，测得在一段能区(Ex=5.5～9.2 MeV)内21 Na(p, p)21 Na的激发函数。通过对21 Na(p, p)共振弹性散射截面进行R矩阵拟合，得到了22 Mg共振能级的自旋宇称以及质子宽度等信息，从而为计算18Ne(α, p)21Na反应率提供了实验参数。

The 18Ne(α,p)21Na reaction is thought to be one of the key breakout reaction from the hot CNO cycle to the rp-process in X-ray bursts. Over stellar temperatures achieved in XRBs, this rate has not been sufficiently determined. The experiment was performed using CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study (CNS) of the University of Tokyo. An 89 MeV 21Na radioactive ion beam was produced and bombarded an 8.8 mg/cm2 thick polyethylene target. The recoiled light particles were detected with three Micron silicon?E-E telescopes centered at angles ofθlab=0°, +14° and -14° with respect to the beam direction, respectively. The 21Na+p elastic-scattering excitation functions were reconstructed with a thick-target method over energies Ex=5.5～9.2 MeV. The resonance parameters have been determined through an R-matrix analysis,which will be used to evaluate the 18Ne(α, p)21Na reaction rate.

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