High-spin states in 212Po above the a-decaying (18+) isomer
High-spin states in 212Po above the a-decaying (18+) isomer
复制标题
a 衰变 (18) 异构体上方 212Po 中的高自旋态
DOI：
10.1016/j.physletb.2022.137457
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发表时间：
2022
影响因子：
4.4
通讯作者：
Zago L
中科院分区：
文献类型：
--
作者：
Zago L
212 Po核是由1GeV/核子的238 U原束在GSI碎裂产生的，用FRS分离器分离，用RISING装置进行同质异能素γ衰变谱研究。观测到了两种以前未知的延迟γ射线。其中一个被归因于21−同分异构态的E3衰变，为α发射的45-s（18+）高自旋同分异构体提供能量。另一条γ射线线被认为是23+亚稳态的衰变。这是第一次观察到高于212 Po（18+）异构体的高自旋态，这是通过对238 U碎片产物进行逐离子鉴定获得的选择性。与壳层模型计算的比较表明，在涉及高j质子和中子轨道的核相互作用中存在不足，Z = 100附近的区域对高j质子和中子轨道很敏感。
The nucleus 212Po has been produced through the fragmentation of a 238U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21− isomeric state feeding the α-emitting 45-s (18+) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23+ metastable state. These are the first observations of high-spin states above the 212Po (18+) isomer, by virtue of the selectivity obtained via ion-by-ion identification of 238U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼ 100 is sensitive.