中能重离子碰撞中带电粒子多重性的同位旋效应

来源 :高能物理与核物理 | 被引量 : 0次 | 上传用户:tempman
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利用兰州4π带电粒子探测器阵列测量带电粒子多重性,研究了55MeV/u 40 Ar+58,64Ni核反应中He和中等质量碎片的产额与反应系统同位旋的关系,以及这种同位旋效应与反应系统的碰撞参数(即碰撞的激烈程度)、系统的激发能的变化关系. 对两个反应系统,观察到带电粒子多重性中He的比分随带电粒子多重性的增加而增大,带电粒子多重性中IMF的比分随带电粒子多重性的增加而先增大,后减小的规律. 两个反应系统虽然具有相同的核电荷数,但轻粒子He和中等质量碎片在多重性中的比分有明显的同位旋相关性.
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