【摘要】 用放化法首次测定了²⁵²Cf自发裂变中^127gSn和¹²⁸Sn的累计产额,其值分别为（0.0437±0.002）%和（0.145±0.007）%。¹²⁸Sn的测量值较Zp经验模型预报值0.164％偏低,但与Ap′经验模型预报值0.145%符合很好。这一结果和已有热中子诱发²³⁵U裂变时对称区In及其互补元素Tc的实验数据都表明,Ap′经验模型较Zp经验模型更好地描述对称区的电荷分布。更多还原

【Abstract】 The cumulative yields (CY) of 127gSn and l28Sn in the spontaneous fission of 252Cf have been determined by the radiochemical method. The values are (0. 0437 +0. 0021)% and (0. 145 + 0. 007)% respectively. The cumulative yield of 128 Sn determined in this work is lower than the expectation value (0. 164%)obtained by the empirical Zp model, but is in good agreement with the expectation value (0. 145%) according to empirical A’p model. Both the yield of 128Sn measured in this work and the yields of Tc and In measured in the thermal neutron-induced fission of 235U have shown that the empirical A’p model is better than Zp model in representing nuclear charge distribution near the symmetrical range in fission.更多还原