Investigation on structural properties of the pi i(13/2 circle times)nu i(13/2) 2-qp band in odd-odd Au-184

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184Au的高自旋态能级结构.扩展了基于πh9/2(×)ν7/2-[514]和πi13/2(×)νi13/22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-[514]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 Au-184 have been re-investigated using the Tb-159(Si-29,4ngamma)Au-184 reaction and the multidetector array of GASP. The rotational bands built on the pih(9/2)xnu7/2- [514] and pii(13/2) x nui(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 pii(13/2) x nui(13/2) band in Au-184. This result provides a strong evidence for the prediction that the low-spin signature inversion could occur in the pii(13/2) x nui(13/2) bands of odd-odd nuclei in the A approximate to 180 mass region. The quasipartice alignments and the dynamical moment of inertia have been analyzed for the pii(13/2) x nui(13/2) band in Au-184, the pii(13/2) and pih(9/2) bands in Au-183, and the nui(13/2) band in Pt-183. It is concluded that the first band-crossing observed in the pii(13/2) x nui(13/2) band of Au-184 corresponds to a pair of h(9/2)-proton alignment. This proton alignment may play important role in the pii(13/2) band of Au-183, the nui(13/2) band of Pt-183 as well as in the ground-state band of Pt-182.国家自然科学基金,国家杰出青年科学基金,国家973计划,中国科学院资助SCI(E)中文核心期刊要目总览(PKU)中国科技核心期刊(ISTIC)中国科学引文数据库(CSCD)9907-9132