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粒子–转子模型分析超形变转动带 总被引:1,自引:1,他引:0
利用三轴粒子-转子模型计算了193Tl超形变带γ跃迁能量,运动学转动惯量J(1)和动力学转动惯量J(2),并与实验值进行比较得到了满意的结果;预言了B(M1)值以及动力学电四极矩Q(1)和Q(2)指出在超形变带的分析中粒子-转子模型是一种可以采用的方法. 相似文献
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利用q变形转动惯量的转子模型,系统地计算了148Gd核6个超形变带的E2r跃迁能谱以及相应的动力学转动惯量随转动频率的变化关系.计算结果表明,q变形转动惯量的转子模型不仅能较精确地描述超形变晕带,而且可以描述超形变激发带. 相似文献
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A~190区超形变带能谱分析和自旋的决定 总被引:1,自引:1,他引:0
利用宏观模型系统地分析了A~190区七个超形变核十五条超形变带的能谱,决定了超形变带的自旋值,用三参数公式计算了能谱,运动学转动惯量J(1)和动力学转动惯量J(2),并与实验进行了比较,得到了较满意的结果. 相似文献
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采用处理含有对力的推转壳模型的粒子数字恒方法研究了A-190区奇奇核194TI中6条超形变带,计算结果与实验符合得非常好,根据我们的PNC计算结果,分别指定了194TI的6条超形变带的组态,详细分析了质子和中子的堵塞效应对转动惯形的影响,转动惯量随转动频率的变化主要来源于高N闯入壳(对中子N=7,对质子N=6)的贡献,而其他大壳对转动惯量的贡献基本上不随转动频率变化。 相似文献
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首先概述了对A≈150区超形变带的自旋指定的进展情况, 到目前为止, 所提出的各种方法对该区超形变带自旋值的指定并不一致. 发现了该区超形变带的实验能谱特性和动力学转动惯量的特性. 并将此特性用于指定A≈150区超形变带的自旋. 相似文献
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Microscopic study of electromagnetic properties and band spectra of neutron deficient ~(133,135,137)Sm
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Rakesh K. Pandit R.K. Bhat Rani Devi S.K. Khosa G.H. Bhat J.A. Sheikh 《中国物理C(英文版)》2019,43(12):124108-124108-20
A microscopic high spin study of neutron deficient and normally deformed ~(133,135,137)Sm has been carried out in projected shell model framework.The theoretical results have been obtained for the spins,parities and energy values of yrast and excited bands.Besides this,the band spectra,band head energies,moment of inertia and electromagnetic transition strengths are also Predicted in these isotoPes.The calculations successfully give a deeper understanding of the mechanism of the formation of yrast and excited bands from the single and multi-quasi particle configurations.The results on moment of inertia predict an alignment of a pair of protons in the proton(1 h_(11/2))~2 orbitals in the yrast ground state bands of ~(133-137)Sm due to the crossing of one quasiparticle bands by multi-quasiparticle bands at higher spins.The discussion in the present work is based on the deformed single particle scheme.Any future experimental confirmation or refutation of our predictions will be a valuable information which can help to understand the deformed single particle structure in these odd mass neutron deficient ~(133-137)Sm. 相似文献
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The q-deformed moment of inertia, formulated by was first introduced as the mechanical moment of inertia of superdeformed (SD) nuclei. The E2 transition γ-ray energies and the dynamical moment of inertia of the lowest-formed bands in Hg, Ph, and TI isotopes are calculated. The calculated results indicate that the SD bands may be described by the ided-rotor with the q-deformed mpment of inertia. 相似文献
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The microscopic mechanism of four experimentally observed bands in 172Tm is investigated using the particle-number conserving method of the cranked shell model with monopole and quadrupole paring interactions.The experimental results,including the moments of inertia and angular momentum alignments of four bands in 172Tm are reproduced well by the particle-number conserving calculations.The ω variation of the occupation probability of each cranked orbital and the contribution to moment of inertia from each c... 相似文献
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简述了超形变原子核全同带的研究进展情况,并以Bohr-Mottelson的I(I+1)展开转动谱公式对部分典型的超形变带进行了分析.发现所谓全同带的确只是两个带的J(2)比较接近,它们的J(1)和J0并不相等,而且signature对偶带更接近全同. 相似文献
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A.S. Shalaby 《理论物理通讯》2004,41(3):454-460
The dynamical moment of inertia is estimated with its even-power
expansion of the rotational frequency and in accordance we determine the
intermediate spins of the superdeformed (SD) rotational bands. Using
Marquardt method of nonlinear least-squares routines, we determine the
expansion coefficients by fitting the proposed dynamical moment of inertia
with its recent experimental data of the SD nuclei in the A=190 mass region.
The comparison between our theoretical and available experimental data for
the dynamic moment of inertia and spin shows good agreements.
Also, we have calculated the static moment of inertia at three alternative
values of spin. The value of spin at which the two moments of inertia are
nearly equals is to be regarded as a bandhead spin of the corresponding
band. These studies are carried out for eighteen bands of odd-A nuclei of
the superdeformed region 190, namely 189Hg(b1), 191Hg(b1, b2, b3,
b4), 193Hg(b2, b3, b5), 195Hg(b1, b2, b3, b4), 193Tl(b1, b2,
b3, b5), 189Tl(b1), and 197Bi(b1). We also notice the occurrence
of identical SD bands with near identical transition energies among the
considered SD bands. 相似文献
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By fitting the E2 transition spectra of superdeformed bands in A~190 region, the coefficients of Bohr-Mottelson's I(I+1) expansion are determined and moments of inertia of band head are calculated out. All results show that the moments of inertia of odd-A nuclei are systematically larger than those of the neighboring even-even nuclei, and the moments of inertia of odd-odd nuclei are systematically larger than those of the neighboring odd-A nuclei. The odd-even difference of moment of inertia of nuclear superdeformed states is obvious. 相似文献
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The K=1/2 rotational band in
171Yb is investigated
using the particle number conserving (PNC) method for treating the cranked
shell model with monopole and quadrupole pairing interactions. The
experimental moments of inertia of
171Yb [521]1/2 (signature α =±1/2) are reproduced well by the PNC calculation, in which no free
parameter is involved. The difference in the contribution to the moment of
inertia between protons and neutrons is mainly due to the blocking effect of
neutron normal orbitals. The ω variation of the occupation
probability of each cranked orbital and the contribution to the moment of
inertia from each major shell and from each cranked orbital are
investigated. 相似文献