排序方式: 共有112条查询结果,搜索用时 412 毫秒
101.
在166MeV的束流能量下,利用重离子熔合蒸发反应142Nd(32S, 1p3nγ) 170Re布居了170Re的高自旋激发态. 用12套带BGO反康普顿抑制的高纯锗探测器阵列进行了在束X-γ和γ-γ符合测量. 基于对实验测量结果及周围邻近核已知信息的综合分析,首次建立了双奇核170Re的转动带能级纲图. 根据实验提取出的准粒子顺排、旋称劈裂等结构特征和Re双奇核同位素带结构系统学知识的比较分析,指出该带的准粒子组态是πh11/2(○×)υi13/2. 相似文献
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丰中子核91Y 的高自旋能级结构通过82Se(13C, p3n)91Y 反应被再次研究了。新建立的包含几条关键能级的能级纲图澄清了以前研究中的几点不确定的地方。这几条能级具有Z=38 和N=56 子闭壳打破的特征,这涉及到张量力和自旋-同位旋依赖的中心力。High-spin level structure of the neutron-rich nucleus 91Y has been reinvestigated via the 82Se(13C, p3n)91Y reaction. A newly constructed level scheme including several key levels clarifies the uncertainties in the earlier studies. These levels are characterized by the breaking of the Z = 38 and N =56 subshell closures, which involves in tensor force and the spin-isospin dependent central force. 相似文献
106.
High-spin states in 139Nd nucleus have been reinvestigated with the reaction 128Te (16O, 5n) at a beam energy of 90 MeV. The level scheme has been expanded with spin up to 47/2 h. At the low spin states, the yrast collective structure built on the νh11 / 2-1 multiplet shows a transitional shape with γ≈32° according to calculations of the triaxial rotor-plus-particle model. Three collective oblate bands with γ~-60° at the high spin states were identified for the first time. A band crossing is observed around hω~0.4 MeV in one oblate band based on the 25/2- level. 相似文献
107.
A new level scheme of 112In have been established up to 6.8 MeV in excitation energy and to a tentative spin of (21+) through the reaction 110Pd(7Li,5n)112In at a beam energy of 50 MeV. In-beam measurements involving γ-γ coincidences and directional correlation of oriented states were performed. M1 bands consisting of ΔI=1 dipole transitions have been observed. Possible quasiparticle configurations suggest that these bands are similar to the shears bands observed in Pb nuclei. 相似文献
108.
The magnetic-rotational band in 85Zr was populated by the fusion-evaporation reaction 60Ni(28Si, 2pn)85Zr with a 98 MeV Si beam from the HI-13 tandem accelerator at China Institute of Atomic Energy. The g-factors of the high spin states of this magnetic rotation band in 85Zr were measured by the TMF-IMPAD method for the first time. The measured g-factors decrease with the increasing of spin. It implies that the valence neutron alignment is more rapid than that of the valence proton, which leads to a decrease of g-factors along the band. 相似文献
109.
High-spin states of ^160Tm are studied by the ^146 Nd(^19F, 5n) reaction at a beam energy of 102 MeV. The previously known πh11/2 + vi13/2 yrast band and πh11/2 + vh9/2 side band are confirmed. The level scheme is enriched and more low-lying levels are observed. A new side band is observed and assigned as the favoured signature partner of πd3/2 + vi13/2. The spin of this band is assigned with the energy level systematics. It is pointed out that the B (M1)/B (E2) ratios increase rapidly at the high frequency approaching the second crossing in the π h11/2 + vi13/2 braid, which is closely related to the alignment gain of the aligned i13/2 quasineutron. 相似文献
110.
通过重离子熔合蒸发反应116Cd(27Al, 4n)布居了139Pm的高自旋激发态,用12台高纯锗探测器(HpGe)阵列进行了在束γ-γ 符合测量。 基于γ-γ符合关系及139Pm核已知的能级信息,建立了两条ΔI=1的负宇称带。 利用相邻核能级结构的系统性和依据半经典的核子-核子有效作用的理论模型(SPAC)对这两条带能级结构进行了定量计算, 认为它们属于磁转动带。 High spin states in 139Pm have been studied via the116Cd(27Al, 4n) heavy ion fusion evaporation reaction. The γ-γ coincidences were measured with 12 HpGe detectors. Based on γ-γ coincidence relationships and previously known levels in 139Pm, two ΔI=1 negative parity bands have been established. From the systematic comparison with the neighbouring nuclei and semi classical effective interaction model (SPAC) calculations, the two bands were suggested as magnetic rotational bands. 相似文献