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Tensor Force Effect on Shape Coexistence of N = 28 neutron-rich Isotones

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Chinese Physics Letters 2014年第10期31卷 34-36页

作者：王艳召顾建中于国梁侯召宇 Department of Mathematics and Physics Shijiazhuang TieDao University Shijiazhuang 050043 China Institute of Atomic Energy Beijing 102413 Department of Mathematics and Physics North China Electric Power University Baoding 071003

The tensor force effect on potential energy surfaces of the N = 28 neutron-rich isotones is investigated by using the deformed Skyrme Hartree-Fock-Bogoliubov approach with the T22 interaction. It is found that, without the tensor force, ^40Mg and ^46At have prolate and spherical ground states, respectively. The ground states of ^42Si and ^44S are oblate. The shape coexistence in ^40Mg, ^42Si and ^44S is evident. However, the ground state deformations of these isotones are not changed and the shape coexistence in ^42Si and ^44S vanishes when the tensor force is switched on. Taking ^42Si as an example, the disappearance of the shape coexistence is understood by analyzing the tensor force effect on the shell correction energies.

关键词： Tensor Isotones neutron-rich

The low-lying rotational bands of the neutron-rich nucleus ^(172)Tm

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Science China(Physics,Mechanics & Astronomy) 2009年第10期52卷 1542-1547页

作者： CHEN BaoRen1,LI Tao1 & LIU ShuXin1,2 1 School of Physics,Peking University,Beijing 100871,China 2 Center of Theoretical Nuclear Physics,National Laboratory of Heavy Ion Collisions,Lanzhou 730000,China School of Physics Peking University Beijing China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Collisions Lanzhou China

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 *** experimental results,including the moments of inertia and angular momentum alignments of four bands in 172Tm are reproduced well by the particle-number conserving *** ω variation of the occupation probability of each cranked orbital and the contribution to moment of inertia from each cranked orbital are *** unobserved low-lying bands of 2-quansiparticles in 172Tm are predicted.

关键词： neutron-rich nucleus rare earth rotational band

Tensor force effect on the exotic structure of neutron-rich Ca isotopes

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Chinese Physics C 2019年第11期43卷 67-76页

作者： Yan-Zhao Wang Xue-Dou Su Chong Qi Jian-Zhong Gu Department of Mathematics and Physics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Institute of Applied Physics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Physics Royal Institute of Technology(KTH)SE-10691 StockholmSweden China Institute of Atomic Energy P.O.Box 275(10)Beijing 102413China School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100191China

The structure of neutron-rich Ca isotopes is studied in the spherical Skyrme-Hartree-Fock-Bogoliubov(SHFB)approach with SLy5,SLy5+T,and 36 sets of TIJ *** calculated results are compared with the available experimental data for the average binding energies,two-neutron separation energies and charge *** is found that the SLy5+T,T31,and T32 parametrizations reproduce best the experimental properties,especially the neutron shell effects at N=20,28 and 32,and the recently measured two-neutron separation energy of *** calculations with the SLy5+T and T31 parametrizations are extended to isotopes near the neutron drip *** neutron giant halo structure in the very neutron-rich Ca isotopes is not seen with these two ***,depleted neutron central densities are found in these *** analyzing the neutron mean-potential,the reason for the bubble-like structure formation is given.

关键词： spherical SHFB approach tensor force neutron-rich Ca isotopes neutron giant halo bubble structure

Structure analysis of ^(159)Sm and properties of odd-mass neutron-rich nuclei in mass-160 region

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Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 81-87页

作者： YANG YingChun1 & SUN Yang1,2,3 1 Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA Department of Physics Shanghai Jiao Tong University Shanghai China Institute of Modern Physics Chinese Academy of Sciences Lanzhou China Department of Physics and Astronomy University of Tennessee Knoxville USA

Recent fission experiment data provide interesting structure information for neutron-rich nuclei in the mass A ～ 160 region. We apply the projected shell model to study the strongly-deformed, neutron-rich Sm isotopes. We perform calculations for rotational bands up to spin I = 20 (29/2) for even-even (odd-neutron) Sm isotopes, and analyze the band structure of low-lying states with quasiparticle excitations. Emphasis is given to rotational bands based on one-quasiparticle (1-qp) configurations in the odd-mass 159Sm. The 159 Sm result is discussed together with those of the even-even isotopes 158,160Sm. New bands in 159Sm based on neutron 1-qp 1/2 and 5/2+ configurations are predicted. Electromagnetic transition probabilities are discussed.

关键词： projected shell model neutron-rich nuclei low-lying excitations isomeric states

High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus 163Eu

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Chinese Physics C 2019年第6期43卷 59-63页

作者： Xiao-Tao He Ze-Long Chen College of Material Science and Technology Nanjing University of Aeronautics and Astronautics

The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus 163 Eu are investigated by using the cranked shell model(CSM), with pairing treated by the particle-number conserving(PNC)method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in 163 Eu. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state 13^-/2(v7^+/2 [633]■v1^-/2[521]■π5^+/2[413]).More low-lying multi-particle states are predicted in 163 Eu. Due to its significant effect on the nuclear mean field, the high-order ε6 deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei 162 Sm and 164 Gd,there is a 10%15% increase of J(1) of the oneparticle ground-state band in 163 Eu. This is explained by the pairing reduction due to the blocking of the nucleon on the proton π5+/2 [413] orbital in 163 Eu.

关键词： neutron-rich nuclei isomer high-order deformation moment of inertia odd-mass nuclei

New multi-phonon gamma vibrational bands in A～110 neutron-rich nuclei

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Science China(Physics,Mechanics & Astronomy) 2011年第S1期54卷 44-48页

作者： HAMILTON J H RAMAYYA A V RASMUSSEN J O HWANG J K YEOH E Y Department of Physics Vanderbilt University Nashville TN 37235 USA Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Department of Physics Tsinghua University Beijing 100084 China

The high spin states of neutron-rich 103Nb, 107Tc and 109Tc nuclei in A^110 region have been investigated by measuring prompt γ-γ-γ coincident measurements populated with the spontaneous fission of 252Cf with the Gammasphere detector array. In 103Nb, one-phonon K = 9/2 and two-phonon K = 13/2 γ-vibrational bands have been identified. In 107Tc and 109Tc, one-phonon K = 11/2 and two-phonon K = 15/2 γ-vibrational bands, in which the zero-phonon bands are based on K=7/2 excited states, have also been identified. The two-phonon bands are first observed in odd-Z nuclei. The characteristics for these band structures have been discussed.

关键词： high spin states neutron-rich nucleus γ-vibrational bands

Seniority and (9/2)^(n) configurations in neutron-rich Nickel isotopes

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Chinese Physics C 2022年第7期46卷 103-111页

作者： S.Sidorov D.Zhulyaeva T.Tretyakova Faculty of Physics Lomonosov Moscow State UniversityMoscow 119991Rusia Skobeltsyn Institute of Nuelear Physicso Moscow State University Moscow 119991Rssia

Excited states in low-energy spectra of ^(70-76) Ni are considered. Accordingly, pairing forces in the form of surface delta interaction are employed to account for the formation of the ground state multiplet with seniority v= 2 states. The multiplet splitting is described with mass relationships of masses of neighboring nuclei. Subsequently, the seniority model is adopted to reproduce or predict the states v= 3 in odd-even isotopes and v= 4 in even-even isotopes. The correct account of the 2^(+)_(1) state should allow for the description of the reversed order of J = 4 states with v= 2 and v= 4 observed in experiments. The results obtained are compared with the structure of similar multiplets in N=50 isotones.

关键词： shell model nucleon pairing seniority scheme neutron-rich isotopes

K~π=5^- rotational bands in neutron-rich Mo,Ru,and Pd nuclei

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Chinese Physics C 2019年第8期43卷 99-103页

作者： A-Can Dai Fu-Rong Xu Wu-Yang Liang State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Nuctech Company Limited Beijing 100084China

The collective rotations of the K^π=5^- configuration in neutron-rich Mo, Ru and Pd isotopes were systematically investigated by the configuration-constrained cranking shell model based on the Skyrme Hartree-Fock method with pairing treated by shell-model diagonalization. The calculations efficiently reproduce the experimental moments of inertia of both the ground-state and side bands. Rotational bands built on two-particle K^π=5^- configurations have been the subject of intense study. Possible configurations were assigned to the observed 5^- bands in ^102-106Mo,^108-112Ru and ^112-114Pd. We predict the existence of the 5^- bands in ^108,110Mo. These results provide deep insights into the structure of neutron-rich nuclei, and provide useful information for future experiments.

关键词： configuration-constrained neutron-rich pairing rotational band

Shell-model Study of neutron-rich Λ-hypernucleus _Λ^(10)Li

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原子核物理评论 2009年第S1期26卷 59-63页

作者： A.Umeya T.Harada Research Center for Physics and Mathematics Osaka Electro-Communication University

We investigate a Σ-mixing probability of a neutron-rich Λ-hypernucleus 10ΛLi by using microscopic shell-model calculations considering a Λ-Σ coupling in the first order perturbation. The theoretical Σ-mixing probability in 10ΛLi is found to be about 0.48%,due to the appearance of multi-configuration Σ Nuclear excited states which can be strongly coupled with the Λ ground state in 10ΛLi.

关键词： hypernuclei neutron-rich shell model