Naik Haladhara, Singh Ram Janam, Dange Srikant Pandurang
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.
Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India.
Appl Radiat Isot. 2021 Jul;173:109718. doi: 10.1016/j.apradiso.2021.109718. Epub 2021 Apr 16.
Fractional cumulative yields (FCY) of various light mass fission products in the U (n, f), Pu(n, f) and Cm(SF) reactions were measured by using an off-line γ-ray spectrometric technique. The values of most probable charge (Z) were obtained by using the width of isobaric charge distribution (σ) of nearby fissioning systems with proper apportion. From the Z values, the experimental charge polarization (ΔΖ) as a function of fragment mass were also deduced. The ΔΖ values for the light mass chains from the present work and for the heavy mass chains from earlier work show an oscillating nature in the interval of five mass units, which is due to even-odd effect. A local effect around the shell region for some mass chains and a systematic decreasing trend with the approach of symmetric split was also observed. The ΔΖ values based on minimum potential energy surface were theoretically calculated, which also shows a systematic decreasing trend with the approach of symmetric split due to the liquid drop behaviour of the fissioning nucleus.
采用离线γ射线能谱技术测量了U（n，f）、Pu（n，f）和Cm（SF）反应中各种轻质量裂变产物的分数累积产额（FCY）。通过适当分配附近裂变系统的同量异位素电荷分布宽度（σ），得到了最可几电荷（Z）的值。从Z值出发，还推导了作为碎片质量函数的实验电荷极化（ΔΖ）。本工作中轻质量链和早期工作中重质量链的ΔΖ值在五个质量单位的区间内呈现出振荡性质，这是由于奇偶效应。还观察到一些质量链在壳层区域周围的局部效应以及随着对称分裂的临近而呈现出的系统下降趋势。基于最小势能面理论计算了ΔΖ值，由于裂变核的液滴行为，随着对称分裂的临近，该值也呈现出系统下降趋势。
