ß -delayed fission of isomers in Bi 188
ß -delayed fission of isomers in Bi 188
复制标题
�-Bi 188 异构体的延迟裂变
DOI：
10.1103/physrevc.102.014319
复制
发表时间：
2020
影响因子：
3.1
通讯作者：
Andel B
中科院分区：
文献类型：
--
作者：
Andel B
在CERN的ISOLDE装置上研究了一个低自旋（ls）和一个高自旋（hs）同质异能体的延迟裂变（DF）衰变。采用选择性激光电离和时间门控技术分别对各异构体进行了研究，并测定了它们的DF部分半衰期。这项工作是首次DF研究的两个国家在一个同位素，并允许自旋依赖的低能裂变进行探索。推导出子体核素随高自旋异构体衰变后裂变碎片的质量分布，表明裂变模式为对称和非对称的混合。实验结果进行了比较与自洽平均场计算的基础上的有限范围Gogny D1 M相互作用。为了重现测量的结果，计算的裂变势垒必须减少。经过这种简化后，对几种可能的构型的测量与计算是一致的。这些配置的理论DF概率被发现是低的4-9倍比的DF概率。并与裂点模型SPY和基于有限程液滴模型的计算结果进行了比较。本文还报道了DF的首次观测结果。
-delayed fission (DF) decay of a low-spin (ls) and a high-spin (hs) isomer inwas studied at the ISOLDE facility at CERN. Isomer-selective laser ionization and time gating were employed to investigate each isomer separately and theirDF partial half-lives were determined:s ands. This work is the firstDF study of two states in one isotope and allows the spin dependence of low-energy fission to be explored. The fission fragment mass distribution of a daughter nuclide, following thedecay of the high-spin isomer, was deduced and indicates a mixture of symmetric and asymmetric fission modes. Experimental results were compared with self-consistent mean-field calculations based on the finite-range Gogny D1M interaction. To reproduce the measured, the calculated fission barrier ofhad to be reduced by. After this reduction, the measuredwas in agreement with calculations for a few possible configurations for. TheoreticalDF probabilities for these configurations were found to be lower by a factor of 4–9 than theDF probability of. The fission fragment mass distribution ofwas compared to the scission-point model SPY and the calculations based on the finite-range liquid-drop model. The first observation ofDF foris also reported.