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用 13单元望远镜探测器阵列测量了 30MeV u40 Ar +112 ,12 4Sn反应中小角关联粒子 ,由两体符合事件提取了α α关联函数 .用三体弹道理论模型MENEKA计算本底关联函数 ,用Monte Carlo方法计算探测效率函数 ,在扣除本底产额并考虑探测效率的修正后 ,对不同同位旋反应系统 40 Ar +112 Sn和 40 Ar+12 4Sn提取的相对态布居核温度分别是 4 .18±0 .2 50 .2 1MeV和 4 .10±0 .2 20 .2 0 MeV ;考察态布居核温度和粒子能量的关系时 ,观察到两个系统的发射温度均随着粒子能量的增加而降低 ,缺中子系统40 Ar +112 Sn中由低能时的 5 .13±0 .3 00 .2 6MeV降低到高能时的 3.87±0 .3 70 .2 9MeV ,丰中子系统 40 Ar +12 4Sn中由低能时的 5 .39±0 .3 00 .2 6MeV降低到高能时的 3.32±0 .2 80 .2 3 MeV .用激发热核衰变过程的同位旋选择性对这种同位旋相关性进行了解释
The small-angle correlation particles in the 30 MeV u40 Ar +112 and 12 4Sn reactions were measured by a 13-unit telescope detector array, and the α α correlation function was extracted from the coincidence events of the two entities. The background correlation function was calculated using the three-body ballistic theory model MENEKA, Carlo method was used to calculate the detection efficiency function. After deducting the background yield and taking into account the detection efficiency, the relative home nucleus temperature of 40 Ar + 112 Sn and 40 Ar + 12 4Sn extracted from different isospin reaction systems was 4. 18 ± 0 .2 50 .2 1 MeV and 4 .10 ± 0 .2 20 .2 0 MeV. When investigating the relationship between the nucleus temperature of the nucleus and the energy of the particles, it was observed that the emission temperatures of both systems are as a function of the energy of the particles Increases and decreases, while in neutron system 40 Ar +112 Sn decreases from 5.113 ± 0.300.26MeV at low energy to 3.87 ± 0.33 70.29MeV at high energy, the abundance of neutron system 40 Ar +12 4Sn from 3.39 ± 0.300.26 MeV at low energy to 3.32 ± 0.28 80.23 MeV at high energy. By using isospin-like selectivity for the excited thermonuclear decay process, The spin correlation is explained