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Collective Band Structures in the Neutron-Rich ^(107,109)Ru Nuclei

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Chinese Physics Letters 1998年第11期15卷 793-795页

作者： ZHU Sheng-jiang GAN Cui-yun J.H.Hamilton A.V.Ramayya B.R.S.Babu m.sakhaee W.C.ma LONG Gui-lu DENG Jing-kang ZHU Ling-yan LI ming YANG Li-ming J.Komicki J.D.Cole R.Aryaeinejad Y.K.Dardenne m.W.Drigert J.O.Rasmussen m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.mohar S.G.Prussin I.Y.Lee N.R.Johnson F.K.mcGowan Departmet 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 Oak Ridge National Laboratory Oak RidgeTN 37831USA

The levels in neutron-rich odd-A ^(107,109)Ru nuclei have been investigated by using γ -γ -and γ -γ -γ-coincidence studies of the prompt γ-rays from the spontaneous fission of 252Cf. The ground state bands and the negative parity bands are identified and expanded in both nuclei. Triaxial rotor plus particle model calculations indicate the ground state bands originate from v(d_(5/2)+g_(7/2)) quasiparticle configurations and the negative parity bands are from vh_(11/2) orbital.

关键词： bands parity

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

Octupole Deformation Bands of πh_(11/2) in Neutron-Rich 145,147La Nuclei

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Chinese Physics Letters 1999年第3期16卷 169-171页

作者： ZHU Sheng-jiang WANG mu-ge J.H.Hamilton A.V.Ramayya B.R.S.Babu W.C.ma LONG Gui-lu ZHU Ling-yan LI ming A.sakhaee GAN Cui-yun YANG Li-ming J.Komicki 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 G.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

Octupole deformation bands built onπh ll/2 orbital in neutron-rich odd-Z 145,147La nuclei have been investigated by measuring the promptγ-rays emitted from the 252Cf *** alternating parity band structures and strong E1 transitions observed between negative-and positive-parity bands in both nuclei indicate the octupole deformation enhanced by the h ll/2 single proton *** to observed energy displacements the octupole deformation becomes stable at the intermediate spin states.

关键词： coupling. bands parity

丰中子核^(145,147)La的八极形变

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高能物理与核物理 2000年第5期24卷 418-425页

作者：朱胜江王牧歌朱凌燕李明甘翠云杨利明萨哈伊朴秀日邓景康龙桂鲁 J.H.Hamilton A.V.Ramayya B.R.S.Babu J.K.Hwang W.C.ma J.Komicki 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.Oganes 清华大学现代应用物理系北京100084 DepartmentofPhysics VanderbiltUniversityNashville DepartmentofPhysics MississippiStateUniversity IdahoNationalEngineeringLaboratory IdahoFalls LawrenceBerkeleyLaboratoryBerkeley JointInstituteforNuclearResearch

通过对 2 5 2　Cf自发裂变产生的瞬发γ谱的实验研究 ,建立与扩展了丰中子核145 ,147　　La的高自旋态能级图 ,最高自旋态达到 ( 4 1 / 2 + )与 ( 4 3/ 2 - ) .测得的交叉相联的相反宇称带及带间的强化E1跃迁说明在 145 ,147　　La中形... 详细信息

通过对 2 5 2　Cf自发裂变产生的瞬发γ谱的实验研究 ,建立与扩展了丰中子核145 ,147　　La的高自旋态能级图 ,最高自旋态达到 ( 4 1 / 2 + )与 ( 4 3/ 2 - ) .测得的交叉相联的相反宇称带及带间的强化E1跃迁说明在 145 ,147　　La中形成强的八极形变 .对145 La的研究表明 ,具有轴对称形状的四极形变与具有反演不对称形状的八极形变在同一核中产生共存与竞争 .在πh11/ 2 带中观测到的带交叉位于 ω≈ 0 2 6— 0 30meV附近 ,由推转壳模型计算表明 ,它是由一对i13/ 2

关键词：高自旋态八极形变镧145 镧147