Proton-neutron configurations in 236g, mAm and its EC-decay daughter 236Pu
Proton-neutron configurations in 236g, mAm and its EC-decay daughter 236Pu
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236g、mAm 及其 EC 衰变子体 236Pu 中的质子-中子构型
DOI：
10.1140/epja/i2004-10096-6
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Kawade
中科院分区：
文献类型：
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作者：
M. Asai;M. Sakama;K. Tsukada;S. Ichikawa;H. Haba;I. Nishinaka;Y. Nagame;S. Goto;Y. Kojima;Y. Oura;H. Nakahara;M. Shibata;K. Kawade
用气体喷射耦合在线同位素分离器研究了236 Am的EC衰变。半衰期分析表明，236 Am有两个EC衰变态：T1/2= 3.6（2）min的5-态和T1/2= 2.9（2）min的（1-）态。236 Pu的1185.5keV能级为K同分异构体，K π= 5-，t1/2= 1.2（3）μs。236 Pu中从236 g，mAm到1185.5，1311.5和1340.8 keV能级的EC跃迁分别显示出4.9，5.3和4.8的小logft值，表明π5/2+[642] → ν5/2+[633]跃迁对这些跃迁有很大贡献，因此，布居能级应为π5/2-[523]π5/2+[642]双准粒子态。在236 Pu中建立的K π= 0-八极带比在238，240 Pu中建立的K π= 0-八极带位于更高的能量处，这意味着八极关联在236 Pu处变弱。
The EC decay of236Am has been studied using a gas-jet coupled on-line isotope separator. A half-life analysis revealed that there are two EC-decaying states in236Am: the 5-state withT1/2= 3.6(2) min and the (1-) state withT1/2= 2.9(2) min. The 1185.5 keV level in236Pu was found to be theKisomer withKπ= 5-andt1/2= 1.2(3) μs. EC transitions from236g, mAm to the 1185.5, 1311.5, and 1340.8 keV levels in236Pu show small logftvalues of 4.9, 5.3, and 4.8, respectively, indicating that the π5/2+[642] → ν5/2+[633] transition largely contributes to these transitions, and thus, the populated levels should be the π5/2-[523]π5/2+[642] two-quasiparticle states. TheKπ= 0-octupole band established in236Pu is located at higher energy than those in238,240Pu, which implies that the octupole correlations become weak at236Pu.