^(127)I核的新能级纲图(英文)  

A New Level Scheme of ^(127)I

作　　者：张玉虎[1] 马英君 Y.Sasaki K.Yamada H.Ohshima S.Yokose M.Ishizuka T.Komatsubara K.Furuno 

机构地区：[1]中国科学院近代物理研究所,兰州7300002 [2]Institute of Physics and Tandem Accelerator Center

出　　处：《高能物理与核物理》2002年第2期104-107,共4页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年科学基金 ( 1 0 0 2 5 5 2 5 ) ;日本学术振兴会JSPS(L0 0 5 1 5 ) ;国家重点基础研究发展规划 (G2 0 0 0 0 774 0 0 );中国科学院资助~~

摘　　要：利用1 2 4 Sn( 7Li,4n) 1 2 7I反应研究了1 2 7I核的在束γ谱 ,建立了包括 2 5个新能级和 52条新γ射线构成的新能级纲图 .将基于πh1 1 2 粒子态 ( 1 1 2 - )的负宇称能级推高到 ( 3 5 2 - ) ,在较重的1 2 7I核中得到了退耦合能级结构 .由于在两个正宇称带ΔI=2能级系列中观测到了强的带间跃迁 ,建议此带的主要成分为g7 2质子的组态 .另外还观测到了两个正宇称ΔI=2和ΔI=1能级系列 ,它们可能基于πd5 2 的单准粒子带和一个 3准粒子带 .Study of in beam γ ray spectroscopy of 127 I has been performed using 124 Sn( 7Li, 4n) 127 I reaction at 32 MeV beam energy. A new level scheme of 127 I has been established including 25 new levels and 52 new γ transitions. Negative parity levels based on 11/2 - π h 11/2 particle state have been observed up to (35/2 -) extending our knowledge of decoupled structures to the heavier iodine isotope. Two Δ I =2 yrast positive? parity levels have been proposed to be associated mainly with the π g 7/2 configuration due to observations of several strong inter band transitions. Two weakly populated Δ I =2 positive parity levels and a high lying Δ I =1 cascade have been newly identified and tentatively assigned as π d 5/2 one quasiparticle and three quasiparticle bands, respectively.

关 键 词：在束γ谱 ^127I核 能级纲图 准粒子组态 Γ射线 准粒子带 原子核 碘127 

分 类 号：O571.2[理学—粒子物理与原子核物理]