Abstract

Cumulative and independent yields of various fission products within mass ranges of 86 to 119 and 127 to 162 were measured in the spontaneous fission of ²⁵²Cf by using an off-line gamma-ray spectrometric technique. From the cumulative yields of the fission products, their mass chain yields were obtained by using the charge distribution correction. Mass yield distribution parameters such as full-width at tenth-maximum of light and heavy mass wings, average light mass <A_L> and heavy mass <A_H>, and total average neutron multiplicity <ν>_expt were obtained. Fission yield data in the ²⁵²Cf(SF) reaction were compared with similar data in neutron-induced fission and spontaneous fission of other actinides to examine the role of excitation energy and nuclear structure effect. The role of standard I and standard II asymmetric modes of fission is also discussed.

摘要

通过使用离线伽马射线光谱技术，在²⁵² Cf的自发裂变中测量了质量范围为 86 至 119 和 127 至 162 的各种裂变产物的累积和独立产率。从裂变产物的累积产率中，通过使用电荷分布校正获得它们的质量链产率。获得了质量产率分布参数，如轻质和重质翼的第十大宽度、平均轻质<A _L > 和重质<A _H >、总平均中子多重性<ν> _expt。²⁵²裂变产率数据将 Cf(SF) 反应与中子诱导裂变和其他锕系元素自发裂变中的类似数据进行比较，以检查激发能和核结构效应的作用。还讨论了标准 I 和标准 II 不对称裂变模式的作用。