利用 Skyrme 能量密度形式主义研究奇异锘同位素的衰变机制和相关问题

Shubhpreet Kaur, Raj Kumar, Manoj K. Sharma
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摘要

为了研究超重质量区的重离子诱导反应及其随后的衰变机制,人们进行了持续的理论和实验尝试。此外,由于中子/质子壳效应,转铵态元素区域本身也备受关注。在此,我们旨在研究 Z = 102 核的两种同位素(即 248No 和 250No)的后续衰变机制。我们采用基于量子力学碎片理论(QMFT)的动力学簇衰变模型(DCM),对 248No 和 250No 同位素的聚变-裂变(ff)、准裂变(QF)和快速裂变(FF)等复合核(CN)和非复合核(nCN)机制,以及质心能量(Ec.m.)和角动量(ℓ)的作用进行了全面分析。核相互作用势是在 GSkI 力参数域内利用 Skyrme 能量密度形式主义(SEDF)获得的。复合核形成概率(PCN )是通过一个取决于质心能量的函数确定的。探讨了聚变-裂变(ff)准裂变(QF)通道的寿命。在这里,通过包括衰变碎片的四极变形(β2)和最佳取向(θopt.),研究了 Z = 102 锘的两种同位素在质量中心(Ec.m.)宽范围内的 CN 和 nCN 衰变机制。探讨了碎片势能、预形成概率、颈长参数和反应截面。此外,还对多氯化萘进行了计算,以确定 248No 和 250No 同位素的衰变模式。聚变-裂变寿命和准裂变寿命与二核系统(DNS)方法进行了比较。在靠近魔壳闭合 Z = 50 和 N = 82 处观察到了最可能的碎片,如 122Sn 和 128T e。ff和qf寿命随着激发能量的增加而减小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of decay mechanisms and associated aspects of exotic Nobeliumisotopes using the Skyrme energy density formalism
Persistent theoretical and experimental attempts have been made to investigate the heavy ion induced reactions and their subsequent decay mechanisms in superheavy mass region. In addition, the region of transfermium elements is itself of great interest because of the neutron / proton shell effects. Here, we aim to study the subsequent decay mechanisms of two isotopes of Z = 102 nucleus, i.e. 248No and 250No. The dynamical cluster-decay model (DCM) based on Quantum Mechanical Fragmen- tation Theory (QMFT), is employed to conduct a comprehensive analysis of compound nucleus (CN) and non-compound nucleus (nCN) mechanisms such as fusion-fission (ff), Quasi fission (QF) and fast fission (FF), the role of centre of mass energy (Ec.m.) and angular momentum (ℓ) for 248No and 250No isotopes. The nuclear interaction potential is obtained using the Skyrme energy density formalism (SEDF) in the domain of GSkI force parameters. The probability of compound nucleus formation (PCN ) is determined using a function that depends on the centre of mass energy. The lifetimes for the fusion-fission (ff) quasi fission (QF) channels are explored. Here, CN and nCN decay mechanisms for two isotopes of Z = 102 nobelium are studied over the wide range of centre-of-mass (Ec.m.) by including the quadrupole deformation (β2) and optimum orientations (θopt.) of decaying fragments. The fragmentation potential, preformation probability, neck length parameter and reaction cross-sections are explored. Further, the calcula- tions are done for PCN in order to identify the decay modes of 248No and 250No isotopes. The fusion-fission lifetimes and quasi fission lifetimes are compared with the dinuclear system (DNS) approach. The most probable fragments such as 122Sn and 128T e are observed near to the magic shell closure Z = 50 and N = 82. The ff and qf lifetime decreases with increase in the excitation energy.
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