双奇核^(184)Au中πi_(913/2)νi_(13/2)转动带的结构特征研究  

Investigation on Structural Properties of the πi_(13/2)νi_(13/2) 2-qp Band in Odd-odd ^(184)Au

作　　者：张玉虎[1] 王华磊[1] 柳敏良[1] 周小红[1] 郭文 G.de Angelis N.Marginean A.Gadea D.R.Napoli M.Axiotis C.Rusu T.Martinez 许甫荣[3] 

机构地区：[1]中国科学院近代物理研究所 [2]INFN,Laboratori Nazionali di Legnaro,Legnaro,Italy [3]北京大学物理学院技术物理系,北京100871

出　　处：《高能物理与核物理》2004年第9期907-913,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 10 3 75 0 77;10 2 2 10 0 3 );国家杰出青年科学基金 ( 10 0 2 5 5 2 5 ) ;国家重大基础研究发展方案 (G2 0 0 0 0 7740 0 );中国科学院的资助~~

摘　　要：利用重离子熔合蒸发反应和在束γ谱学实验方法 ,研究了双奇核184 Au的高自旋态能级结构 .扩展了基于πh9/ 2 ν7/ 2 - [5 14 ]和πi13/ 2 νi13/ 2 2准粒子组态下的转动带能级纲图 ,建立了两个转动带之间以及πh9/ 2 ν7/ 2 - [5 14 ]带与基态的谱学连接 .从而确定了πi13/ 2 νi13/ 2 带能级的自旋和宇称 ,证实了此转动带在低自旋区出现旋称反转 .分析了πi13/ 2 νi13/ 2 带和相邻核转动带的准粒子顺排特征 ,指出此带的第一回弯以及相邻核转动带在低频观测到的顺排异常可能与h9/ 2 质子顺排有关 .High-spin band structures in 184Au have been re-investigated using the 159Tb( 29Si,4nγ) 184Au reaction and the multi-detector array of GASP.The rotational bands built on the πh 9/2ν7/2- and πi 13/2νi 13/2 2-quasiparticle configurations have been extended up to higher-spin states.Of most importance,linking transitions between the two bands and to the ground state have been established leading to firm spin and parity assignments for the πi 13/2νi 13/2 band in 184Au.This result provides a strong evidence for the prediction that the low-spin signature inversion could occur in the πi 13/2νi 13/2 bands of odd-odd nuclei in the A≈180 mass region.The quasipartice alignments and the dynamical moment of inertia have been analyzed for the πi 13/2νi 13/2 band in 184Au,the πi 13/2 and πh 9/2 bands in 183Au,and the νi 13/2 band in 183Pt.It is concluded that the first band-crossing observed in the πi 13/2νi 13/2 band of 184Au corresponds to a pair of h 9/2-proton alignment.This proton alignment may play important role in the πi 13/2 band of 183Au,the νi 13/2 band of 183Pt,as well as in the ground-state band of 182Pt.

关 键 词：旋称反转 准粒子顺排 高能物理学 双奇核184^Au 转动带 能级结构 

分 类 号：O572[理学—粒子物理与原子核物理]