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Identical Bands and Alignment in ^193,194Tl

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Chinese Physics Letters 2004年第5期21卷 813-816页

作者：贺晓涛于少英刘树新刘艳鑫赵恩广 InstituteofTheoreticalPhysics ChineseAcademyofSciencesPOBox2735Beijing100080 CollegeofScienceandEngineering HuzhouNormalUniversityHuzhou313000 DepartmentofPhysics PekingUniversityBeijing100871 CentreofTheoreticalPhysics NationalLaboratoryofHeavyIonAcceleratorLanzhou730000

The microscopic mechanism of the identical bands in odd–odd nucleus 194Tl and its neighbour odd-A nucleus 193Tl are investigated using the particle-number conserving method with monopole and quadrupole pairing interaction. It is found that the blocking effect plays an important role in the variation of moments of inertia (J(1) and J(2)) with rotational frequency for the superdeformed bands and identical bands. The alignment of 194Tl bands with respect to the 193Tl(1) band used as a reference is also discussed.

关键词： interacting boson model SUPERDEFORMED BANDS SYSTEMATIC DESCRIPTION NUCLEI INERTIA REGION SPIN BLOCKING MOMENTS

How have they started？ - A brief guide for pedestrians

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Frontiers of physics 2018年第6期13卷 3-10页

作者： Takaharu Otsuka Department of Physics University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan Center for Nuclear Study University of Tokyo Hongo Bunkyo-ku Tokyo 113-0033 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Instituut voor Kern- en Stralingsfysica KU Leuven B-3001 Leuven Belgium

I shall present a very brief summary of subjects selected from what Prof. Akito Arima has done in the past years. I will focus on the initial works on the configuration mixing and on the interacting boson model. Since there are many literatures on these subjects, I shall concentrate what have been done at the initial or at the pre-history stages. By doing this, we shall see how Prof. Akito Arima started from the scratch.

关键词： shell model configuration mixing magnetic moment interacting boson model

Band mixing in ^(96,98)Mo isotopes

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Chinese Physics C 2021年第2期45卷 433-440页

作者： A.Jalili Majarshin 罗延安潘峰 Jerry P.Draayer School of Physics Nankai UniversityTianjin 300071China Department of Physics Liaoning Normal UniversityDalian 116029China Department of Physics and Astronomy Louisiana State UniversityBaton RougeLA 70803-4001USA

We use the two lowest weight states to fit E2 strengths connecting the 0←→2 and 2←→4 transitions in ^(96,98)*** results confirm that the 2^+ and 4^+ states are maximally mixed,and that the 0^+ states are weakly mixed in both *** appropriate Hamiltonian to represent the band mixing is found to be exactly solvable,and its eigenstates can be expressed as the basis vectors in the configuration mixing scheme and interacting boson *** interacting boson model and coexistence mixing configuration under the solvable methods are suitable models for analyzing the band mixing with high accuracy.

关键词： band mixing E2 strengths interacting boson model coexistence and mixing configuration

Description of 114 Cd in the E（5） Symmetry

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Chinese Physics Letters 2003年第8期20卷 1231-1233页

作者：张进富龙桂鲁孙扬朱胜江刘凤英贾颖 DepartmentofPhysics TsinghuaUniversityBeijing100084 DepartmentofPhysics ChifengTeacher'sCOllegeforNationalitiesChifeng024001 DepartmentofPhysics TsinghuaUniversityBeijing100084 KeyLaboratoryforQuantumInformationandMeasurementsMOE TsinghuaUniversityBeijing100084 InstituteofTheoreticalPhysics ChineseAcademyofSciencesBeijing100080 DepartmentofPhysics TsinghuaUniversityBeijing100084 DeoartmentofPhysics UniversityofNotreDameNotreDameIndiana46556USA DepartmentofPhysics TsinghuaUniversityBeijing100084 InstituteofReliabilityEngineering BeijingUniversityofAeronauticsandAstronauticsBeijing100083

By analysing the known low-lying levels and the E2 transition rates, it is shown that the empirical scheme of 114Cd is in good overall agreement with the predictions of the transitional dynamical symmetry E(5) proposed by Iachello [Phys. Rev. Lett. 85 (2000) 3580]. This suggests that 114Cd may be better described by an E(5) nucleus than a U(5) nucleus as known before.

关键词： interacting boson model STATES

Two-neutron transfer reactions as a tool to study the interplay between shape coexistence and quantum phase transitions

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Chinese Physics C 2020年第12期44卷 103-113页

作者： J.E.García-Ramos J.M.Arias A.Vitturi Departamento de Ciencias Integradas y Centro de Estudios Avanzados en Física Matemática y ComputaciónUniversidad de Huelva21071 HuelvaSpain Instituto Carlos I de Física Teórica y Computacional Universidad de GranadaFuentenueva s/n18071 GranadaSpain Departamento de Física Atómica Molecular y NuclearUniversidad de SevillaApdo.106541080 SevillaSpain Dipartimento di Fisica e Astronomia“Galileo Galilei” Universitádegli Studi di PadovaPadovaItaly

The atomic mass table presents zones where the structure of the states changes rapidly as a function of the neutron or proton *** them,notable examples are the A≈100 Zr region,the Pb region around the neutron midshell(N=104),and the N≈90 rare-earth *** observed phenomena can be understood in terms of either shape coexistence or quantum phase *** objective of this study is to find an observable that can distinguish between both shape coexistence and quantum phase *** an observable to be analyzed,we selected the two-neutron transfer intensity between the 0+states in the parent and daughter *** framework used for this study is the interacting boson model(IBM),including its version with configuration mixing(IBM-CM).To generate wave functions of isotope chains of interest needed for calculating transfer intensities,previous systematic studies using IBM and IBM-CM were used without changing the *** results of two-neutron transfer intensities are presented for Zr,Hg,and Pt isotopic chains using ***,for Zr,Pt,and Sm isotopic chains,the results are presented using IBM with only a single configuration,i.e.,without using configuration *** Zr,the two-neutron transfer intensities between the ground states provide a clear observable,indicating that normal and intruder configurations coexist in the low-lying spectrum and cross at A=98→*** can help clarify whether shape coexistence induces a given quantum phase *** Pt,in which shape coexistence is present and the regular and intruder configurations cross for the ground state,there is almost no impact on the value of the two-neutron transfer *** is the situation with Hg,where the ground state always has a regular *** the Sm isotope chain,which is one of the quantum phase transition paradigms,the value of the two-neutron transfer intensity is affected strongly.

关键词： two nucleon transfer reactions shape coexistence quantum phase transition interacting boson model

Description of ^(150)Nd nucleus by a new alternative scheme

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Chinese Physics C 2013年第12期37卷 27-31页

作者：戴连荣钟维维丛美玲王礼星 Department of Physics Liaoning Normal University

A new scheme was recently proposed in which the usual SU（3） quadrupole-quadrupole interaction was replaced by an O（6） cubic interaction in the interacting boson model, and also successfully applied to the description of 152Sm for the N=90 rare earth isotones with X（5） symmetry. By using this new scheme, in the present work, we further explore the properties of another candidate of 150Nd for the N=90 with X（5） symmetry. The low-lying energy levels and E2 transition rates are calculated and compared with the experimental data. The results show that the new scheme can also reasonably describe the experimental low-lying spectrum and the intraband and the interband E2 transitions for 150Nd. However, for the low-lying spectrum, the O（6） cubic interaction seems better in describing the energy levels, especially in higher excited states and γ band, yet the 02＋ level within the β band is lower than the corresponding experimental value and the U（5）-SU（3） scheme seems better to describe the low-lying levels of β band; and for the B（E2） transition, for the intraband transitions within the ground band and some interband transitions between the β band and the ground band, the results from O（6） cubic interaction are better than those from SU（3） quadrupole-quadrupole interaction, yet of which seems better to describe the intraband E2 transitions within β band. The present work is very meaningful in helping us to understand in depth the new characteristics of symmetry by the higher order O（6） cubic interaction.

关键词： interacting boson model 0(6) cubic interaction SU(3) quadrupole-quadrupole interaction

Triaxial interaction effect in the structure of ^148-158Sm

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Chinese Physics B 2004年第11期13卷 1835-1842页

作者：张静娟 FalihH.Al-Khudair 李岩松龙桂鲁 DepartmentofPhysics TsinghuaUniversityBeijing100084China InstituteofTheoreticalPhysics ChineseAcademyofSciencesBeijing100080China

The structures of 148-158Sm are studied in the frame of the interacting boson model. Attention is given to the triaxial interaction, and it is found that the triaxial interaction plays an important role in the detailed structure of this isotopic chain. The potential surfaces of these nuclei are also studied and the shapes of them are analysed. And it is found that though the triaxial interaction plays an important role in these nuclei, there are no stable triaxial shapes in the low-lying structures of these nuclei.

关键词： Mixed Symmetry States 148-158Sm isotopes interacting boson model