^(108)Cd正宇称yrast带g-因子测量  

g-factor measurement of positive parity yrast band of ^(108)Cd

作　　者：范平[1] 袁大庆[1] 郑永男[1] 左翼[1] 张乔丽[1] 吴晓光[1] 李广生[1] 竺礼华[2] 许国基[1] 樊启文[1] 梁珺城 张锡珍[1] 朱升云[1] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]北京航空航天大学,北京100191

出　　处：《核技术》2014年第10期29-32,共4页Nuclear Techniques

基　　金：国家自然科学基金(No.10975189)资助

摘　　要：在中国原子能科学研究院的HI-13串列加速器上,利用76Ge(37Cl,1p4n)108Cd重离子熔合蒸发反应布居了108Cd的yrast带高自旋态,采用瞬态场-离子注入扰动角分布(Transient-magnetic filed-ion implantation perturbed angular distribution,TMF-IMPAD)方法测量了108Cd的正宇称yrast带的g因子,测量得到2+、4+态g-因子分别为0.33(11)、0.18(6)。在10+态前后,发生h11/2中子顺排,g-因子值由正转负。从10+态到16+态,由于g7/2中子顺排,导致g-因子逐渐增大。测量得到反磁转动带带头16+态的g-因子为-0.09(3)。Background： The interplay between the collective rotation and the quasi-particle alignment is a significant feature of nuclear structure at high spins. The g-factors of intra-band high spin states of the ground rotational band can provide direct and unique information on quasi-particle alignment since the g-factors of the high-j proton and the high-j neutron are positively large and negatively small, respectively. Purpose： The present work was motivated to measure g-factors of the rotational states of the positive parity yrast band in ^108Cd and to study the quasi-particle alignment. Methods： High spin states of ^108Cd were populated by the fusion-evaporation reaction ^76Ge（^37Cl, 1p4n）^18Cd at beam energy of 135 MeV from the HI-13 tandem accelerator at China Institute of Atomic Energy, and the g-factors were determined by the transient-magnetic filed-ion implantation perturbed angular distribution （TMF-IMPAD） method. Results： The measured g-factors of 2^＋, 4^＋ state are 0.33（11）, 0.18（6）, respectively. The h11/2 neutrons align at the 10＋ state, which leads to the decrement of the g-factors. And the g7/2 neutrons align gradually from 10^＋ to 16^＋, which makes the g-factors increase, Conclusion： The g-factor of the bend head of the anti-magnetic rotation band, 16^＋ state, was measured and the value is -0.09（3）.

关 键 词：g-因子 瞬态场-离子注入扰动角分布方法 ^108Cd 

分 类 号：O571.22[理学—粒子物理与原子核物理]