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Collective Band Structures in Neutron-Rich ^108Mo Nucleus

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Chinese Physics Letters 2007年第6期24卷 1517-1520页

作者：丁怀博朱胜江 j.H.Hamilton A.V.Ramayya j.k.hwang Y.X.Luo j.0.Rasmussen I.Y.Lee 车兴来王建国徐强 Department of Physics Tsinghua University Beijing 100084 Department of Physics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA

High spin states in the neutron-rich ^108Mo nucleus are studied by measuring prompt γ-rays following the spontaneous fission of 252Cf with a Gammasphere detector array. The ground-state band is confirmed, and the one-phonon γ-vibrational band is updated with spin up to 12h. A new collective band with the band head level at 1422.4keV is suggested as a two-phonon γ-vibrational band. Another new band is proposed as a two-quasi- proton excitation band. Systematic characteristics of the collective bands are discussed.

关键词： Collective Structures Neutron-Rich

High-Spin Structure in Neutron-Rich ^108Ru Nucleus

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Chinese Physics Letters 2004年第10期21卷 1904-1907页

作者：车兴来朱胜江 j.H.Hamilton A.V.Ramayya j.k.hwang 禹英男李明亮郑然成 I.Y.Lee j.O.Rasmussen Y.X.Luo W.C.Ma DepartmentofPhysics TsinghuaUniversityBeijing100084 DepartmentofPhysics VanderbiltUniversityNashvilleTennessee37235USA LawrenceBerkeleyNationalLaboratory BerkeleyCalifornia94720USA DepartmentofPhysics MississippiStateUniversityMississippi39762USA

High spin states in the neutron-rich 108Ru nucleus have been studied through measuring prompt γ-ray coincidences following the spontaneous fission of 252Cf with the Gammasphere detector array. The yrast band has been confirmed. The one-phonon γ-vibrational band and the two-quasiparticle band based on the 5− level have been extended up to 13+ and 15−, respectively. In addition, two levels at 1644.8keV and 1826.5keV excitation energies are newly identified and proposed to be the members of a two-phonon γ-vibrational band. It is shown that the 108Ru nucleus has triaxial deformation with parameters β2~0.29 and γ = −22 degrees from the total Routhian surface calculations. The observed band crossing in the yrast band is due to the alignment of a pair of h11/2 neutrons according to the cranked shell model calculations. The possible configuration for the two-quasiparticle band has been discussed.

关键词： Neutrons

Two-Quasiparticle Bands and Isomers in ^98Sr

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Chinese Physics Letters 2004年第11期21卷 2147-2150页

作者：李明亮朱胜江 j.H.Hamilton A.V.Ramayya j.k.hwang 车兴来张征禹英男郑然成 I.Y.Lee j.O.Rasmussen Y.X.Luo W.C.Ma DepartmentofPhysics TsinghuaUniversityBeijing100084 DepartmentofPhysics VanderbiltUniversityNashvilleTennessee37235USA LawrenceBerkeleyNationalLaboratory Berkeley California94720USA DepartmentofPhysics MississippiStateUniversityMississippi39762USA

Rotational bands in neutron-rich 98Sr nucleus have been investigated by measuring high-fold prompt γ-ray coincidence events of the spontaneous fission of 252Cf with the Gammasphere detector array. A deformed k = 3 band built on the 1838keV level has been confirmed and extended. Another deformed k = 6 band based on the 2535keV level has been established. Both the bands originate most probably from the ν9/2[404]⊗ν3/2[411] two-quasiparticle configuration with Ω = |Ω1−Ω2| and Ω = |Ω1+Ω2|, respectively. Based on the delay-coincidence measurements, the half-lives for the k = 3 and k = 6 band head levels have been obtained to be 13±3ns and 4.5±1.0ns, respectively.

关键词： Isomers

Recent Progress of Research on Multi-phonon γ-Bands in A～100 Neutron-Rich Nuclei

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Recent Progress of Research on Multi-phonon γ-Bands in A～1...

丰中子核^(116,118,120)Cd的高自旋态和负宇称能级研究(英文)

第十三届全国核结构研讨会暨第九次全国“核结构与量子力学”专题讨论会

作者： j.H.Hamilton A.V.Ramayya j.k.hwang j.O.Rasmussen I.Y.Lee E.Y.Yeoh Department of Physics Vanderbilt UniversityNashvilleTennessee 37235USA Department of Physics Mississippi State UniversityMississippi StateMississippi 39762USA Department of Physics Tsinghua UniversityBeijing 100084People’s Republic of China

Multi-phonon excitation in deformed nuclei is an impotent topic in research on nuclear structure. Up to now,the one-phononγ-vibrational（1-γ） bands have been observed in many ***,it is difficult to observe the two-phononγ-vibrational（2-γ） *** to now,only few 2-γbands were observed in A～170 and 220 regions,for examples,in Er,Dy and *** the A～100 neutron rich nuclei,2-γbands were reported in Mo in earlier *** our work,no 2-γband was identified in odd-A *** identify 2-γband in odd-A nuclei is important to understand nuclear single-particle motion and collective motion and to develop the nuclear model *** we report on recent progress of research on two-phononγ-bands in A00 neutron-rich nuclei by our cooperative group.

关键词： spontaneous fission neutron-rich nuclei multi-phononγ-bands

来源： cnki会议评论

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高能物理与核物理 2004年第1期28卷 37-41页

作者：肖树冬朱胜江杨利明 j.H.Hamilton A.V.Ramayya j.k.hwang 张征姜卓车兴来禹英男 I.Y.Lee j.O.Rasmussen W.C.Ma 清华大学物理系北京100084 Department of Physics Vanderbilt University Lawrence Berkeley National Laboratory Department of Physics Mississippi State University

通过对 2 52 Cf自发裂变产生的瞬发γ射线的多重符合测量 ,对丰中子核 116,118,12 0 Cd的高自旋态进行了研究 .实验是利用美国罗仑兹伯克利实验室的超级γ球探测装置进行的 .118Cd的晕带自旋扩展到 18 ,而116,12 0 Cd的晕带扩展到 16... 详细信息

通过对 2 52 Cf自发裂变产生的瞬发γ射线的多重符合测量 ,对丰中子核 116,118,12 0 Cd的高自旋态进行了研究 .实验是利用美国罗仑兹伯克利实验室的超级γ球探测装置进行的 .118Cd的晕带自旋扩展到 18 ,而116,12 0 Cd的晕带扩展到 16 .利用推转壳模型对带结构进行了计算 ,对这几个核晕带很陡的回弯现象做了讨论 .在每个核中观测到了 5 -和 7-能级 ,对其特性进行了讨论 .在 118Cd中还观测到一个基于

关键词：高自旋态带交叉负宇称能级丰中子核中子物理 γ射线核晕带回弯现象

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丰中子核^(107)Ru的集体转动带

高能物理与核物理 2002年第8期26卷 791-796页

作者：朱胜江许瑞清 j.H.Hamilton A.V.Ramayya j.k.hwang 张征姜卓甘翠云 X.Q.Zhang I.Y.Lee j.O.Rasmussen W.C.Ma 清华大学物理系北京100084 Department of Physics Vanderbilt University Lawrence Berkeley National Laboratory Department of Physics Mississippi State University

通过对2 5 2 Cf自发裂变产生的瞬发γ谱的测量 ,对丰中子奇A核10 7Ru的高自旋态集体转动带重新进行了研究 ,建立了新的能级纲图 .将基带转动带的自旋态扩展到 2 72  ,证实并扩展了以前发表的基于中子h11/2 激发产生的集体转动带 ,并... 详细信息

通过对2 5 2 Cf自发裂变产生的瞬发γ谱的测量 ,对丰中子奇A核10 7Ru的高自旋态集体转动带重新进行了研究 ,建立了新的能级纲图 .将基带转动带的自旋态扩展到 2 72  ,证实并扩展了以前发表的基于中子h11/2 激发产生的集体转动带 ,并新观测到一个基于 ( 9/ 2 - )能级的集体转动带 .研究结果澄清了早期发表的结果与近来别人发表的结果之间的矛盾 ,对新建立的10

关键词：丰中子核 ^107Ru 集体转动带核结构自发裂变能级结构钌^107

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丰中子Ru奇A核能级结构的进一步研究

高能物理与核物理 2005年第1期29卷 23-27页

作者：朱胜江张征 j.H.Hamilton A.V.Ramayya j.k.hwang 肖树冬车兴来禹英男李明亮郑然成 I.Y.Lee j.O.Rasmussen W.C.Ma 清华大学物理系 Department of Physics Vanderbilt UniversityNashvilleTN 37235USA Lawrence Berkeley National Laboratory BerkeleyCA 94720USA Department of Physics Mississippi State UniversityMS 39762USA

通过对重核2 52 Cf自发裂变产生的瞬发γ谱的高精度测量数据的分析 ,扩展了丰中子奇A核10 9,111Ru的高自旋态 ,对不同延迟符合矩阵的数据分析 ,得到了10 7,10 9,111,113Ru低激发态多个能级的寿命 ,发现10 9Ru核中的 96 .4keV的能级为一... 详细信息

通过对重核2 52 Cf自发裂变产生的瞬发γ谱的高精度测量数据的分析 ,扩展了丰中子奇A核10 9,111Ru的高自旋态 ,对不同延迟符合矩阵的数据分析 ,得到了10 7,10 9,111,113Ru低激发态多个能级的寿命 ,发现10 9Ru核中的 96 .4keV的能级为一寿命约为 130 0ns的同质异能态 .对10 9,111Ru转动带的转动惯量随转动频率变化的分析表明 ,在相邻偶偶核110 Ru中观测到的集体回弯现象确实起源于一对h11/ 2 中子的角动量顺排 .用粒子转子模型对10 7,10 9,111,113Ru的集体带的部分能级及跃迁几率进行了计算 ,得到与实验较为满意的符合 ,指出在这几个核中的中子h11/ 2 闯入带尼尔逊轨道的起源 .

关键词：奇A核能级结构中子低激发态偶偶核同质异能态转动频率寿命实验分析

Collective Bands in Neutron-Rich ^(104)Mo Nucleus

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Chinese Physics Letters 2001年第1期18卷 24-26页

作者： YANG Li-Ming ZHU Sheng-jiang LI ke j.H.Hamilton A.V.Ramayya j.k.hwang X.Q.Zhang ZHU Ling-Yan GAN Cui-Yun M.Sakhaee LONG Gui-Lu XU Rui-Qing HANG Zheng jIANG Zhuo jON Myong-Gil W.C.Ma B.R.S.Babu j.komicki E.F.jones j.D.Cole R.Aryaeinejad M.W.Drigert I.Y.Lee j.O.Rasmussen M.A.Stoyer M.Ter-Akopian A.V.Daniel Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics Vanderbilt UniversityNashvilleTN 37235USA Department of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Lawrence Berkeley National Laboratory BerkeleyCA 94720USA Lawrence Livermore National Laboratory LivermoreCA 94550USA joint Institute for Nuclear Research Dubna141980Russia

Levels in the neutron-rich ^(104)Mo nucleus have been investigated by observing promptγ-rays from the spontaneous fission of 252Cf with the Gammasphere detector *** ground-state band,the one-phonon and the two-phononγ-vibrational bands as well as a quasiparticle band have been confirmed and expanded with spin up to 14ħ.Other two side bands probably built on new quasiparticle states are *** possible configurations for the quasiparticle bands are *** of the quasiparticle bands show larger moments of inertia and may have pair-free *** levels of the ground-state band,the one-phononγ-band and the two-phononγ-band calculated from a general collective model are in close agreement with the experimental data.

关键词： bands phonon quasi

Octupole Deformation and Signature Inversion in ^(145)Ba

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Chinese Physics Letters 1999年第10期16卷 715-717页

作者： ZHU Sheng-jiang M.Sakhaee j.H.Hamilton A.V.Ramayya GAN Cui-yun ZHU Ling-yan YANG Li-ming LONG Gui-lu PAU San-li B.R.S.Babu j.k.hwang W.C.Ma j.komicki X.Q.Zhang E.F.jones j.D.Cole R.Aryaeinejad M.W.Drigert j.O.Rasmussen M.A.Stoyer S.Y.Chu k.E.Gregorich M.F.Mohar S.G.Prussin I.Y.Lee Yu.Ts.Oganessian M.Ter-Akopian A.V.Daniel Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics Vanderbilt UniversityNashvilleTN 37235USA Department of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Lawrence Berkeley Laboratory BerkeleyCA 94720USA joint Institute for Nuclear Research Dubna 141980Russia

High spin states in neutron-rich odd-N ^(145)Ba nucleus have been investigated from study of promptγ-rays in spontaneous fission of^(252)*** alternating parity bands are identified indicating octupole deformation with simplex quantum number s=-*** ground state band shows signature splitting and inversion at low *** collective band structures exhibit the competition and co-existence between symmetric and asymmetric shapes.

关键词： Inversion collective signature