双奇核中πi_(13/2)νi_(13/2)2-准粒子转动带旋称反转研究

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176,178Ir和182 Au的高自旋态结构 ,在这 3个双奇核中观测到了基于πi13 2 νi13 2 准粒子组态下的转动带 .以能级间隔系统学为判据 ,对184Au核中πi13 2 νi13 2 转动带能级自旋进行了指定 .指出176,178Ir和182 ,184Au 4个双奇核的πi13 2 νi13 2 转动带在低自旋区均出现旋称反转 .对πi13 2 νi13 2 转动带旋称反转现象进行了定性的讨论 .用推转壳模型对πh9 2 νi13 2 带和πi13 2 νi13 2 带能级结构进行了理论研究 ,发现当采用形变和对力自洽计算后 。

Multi-quasiparticle rotational bands in neutron-rich erbium isotopes

Multi-quasiparticle states and rotational bands in neutron-rich erbium isotopes have been investigated by the configuration- constrained pairing-deformation-frequency self-consistent total-Routhian-surface （TRS） method with particle-number-conserved pairing. Specifically, the recently observed Kπ = 4- bands in 168,170,172Er have been found to experience a configuration change in our calculation. Some other multi-quasiparticle states with uncertain configuration assignments have been reinvestigated by calculating their collective rotations. The configuration-constrained TRS calculation can reproduce experimental data consistently.

^(229)Ra的衰变纲图

用１４ＭｅＶ中子轰击Ｔｈ靶，通过￣（２３２）Ｔｈ（ｎ，ａ）反应产生了￣（２２９）Ｒａ，由放射化学分离技术从被照靶物质中分离出￣（２２９）Ｒａ的活性，利用γ（Ｘ）谱学方法，首次观测到了属于￣（２２９）Ａｃ的能量为１４．５、１５．６、１８．８、２１．８．２２．５、４４．０、４７．５、５５．０、６３．０、６９．６、９３．６、９４．１．９８．５．１０２．２、１０４．５、１０６．１、１６１．１、１７１．５ｋｅＶ的１８条新衰变γ射线，并建议了￣（２２９）Ｒａ的部分衰变纲图。

转动区偶偶核正宇称态的八极关联效应

运用了Ｕｓｄｐｆ（１６）相互作用玻色子模型讨论了八极自由度Ｐ和ｆ玻色子对转动区偶偶核正宇称态的效应．结果表明，偶数个Ｐ和ｆ玻色子的组态能够混入到通常的基态带，β和γ振动带，并且自然地形成Ｋπ＝１＋、３＋等转动带．这一结果与Ｕｓｄｇ（１５）－ＩＢＭ相类似．本文还简要地给出了基态带间的Ｅ２约化跃迁几率，其结果与Ｕｓｄ（６）－ＩＢＭ相一致．