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OALib Journal期刊
ISSN: 2333-9721
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硼-11质子辐射俘获反应的实验研究
DOI: 10.11889/j.0253-3219.2014.hjs.37.100510, PP. 100510-100510
李二涛, 李志宏, 李云居, 郭冰, 吴志丹, 苏俊, 颜胜权, 王友宝, 王宝祥, 白希祥, 甘林, 金孙均, 刘鑫, 曾晟, 连钢, 孙慧斌, 柳卫平
Keywords: Q3D磁谱仪,弹性转移反应角分布,直接辐射俘获反应,质子谱因子,天体物理反应率
Abstract:
在大爆炸原初核合成(BigBangNucleosynthesis,BBN)反应网络中，11B(p,?)12C反应是合成12C核素的最主要反应之一，对该反应进行精确测量有重要意义。由于库仑势垒的作用，天体物理感兴趣的低能区11B(p,?)12C反应截面极低，直接测量比较困难，一般可以采用谱因子方法进行间接测量。实验使用HI-13串列加速器Q3D磁谱仪和二维位置灵敏半导体探测器(Two-dimensionalPositionSensitiveSiliconDetector,2D-PSSD)，测量了12C(11B,12C)11B弹性转移反应的角分布，并利用扭曲波波恩近似(DistortedwaveBornapproximation,DWBA)理论对实验角分布进行分析，得到了12C的质子谱因子，进而根据辐射俘获理论得到了11B(p,?)12C直接辐射俘获反应的天体物理S(E)因子及反应率。
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