Naik Haladhara, Dange Srikant Pandurang, Singh Ram Janam
Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India.
Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India.
Appl Radiat Isot. 2022 Jan;179:109993. doi: 10.1016/j.apradiso.2021.109993. Epub 2021 Oct 28.
In the fast neutron induced fission of Np, Am and Am, fractional cumulative yields (FCY) of various light mass fission products have been measured for the first time by using an off-line γ-ray spectrometric technique. The most probable charge (Z) and the experimental charge polarization (ΔΖ) as a function of fragment mass were obtained. The ΔΖ values for the light mass chains from the present work and for the heavy mass chains from earlier work show a decreasing trend towards symmetric split with fluctuations for some of the mass chains due to the effect of shell closure proximity. The ΔΖ values based on minimum potential energy surface were theoretically calculated, which also shows a systematic decrease trend with the approach of symmetric split without any fluctuation due to the liquid drop behaviour of the fissioning nucleus.
在快中子诱发的镎、镅和镅裂变中，首次使用离线γ射线能谱技术测量了各种轻质量裂变产物的分数累积产额（FCY）。得到了最可能电荷（Z）以及作为碎片质量函数的实验电荷极化（ΔΖ）。本工作中轻质量链以及早期工作中重质量链的ΔΖ值显示出朝着对称分裂的下降趋势，由于壳层闭合接近效应，一些质量链存在波动。基于最小势能面理论计算了ΔΖ值，其也显示出随着对称分裂的临近呈系统性下降趋势，且由于裂变核的液滴行为不存在任何波动。
