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Collective Bands in Neutron-Rich ^(104)m. Nucleus

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

作者：杨利明朱胜江李科 J.H.Ham.lton A.V.Ram.yya J.K.Hw.ng X.Q.Zhang 朱凌燕甘翠云萨哈伊龙桂鲁许瑞清张征姜卓全明吉 w.C.m. B.R.S.Babu E.F.Jones J.D.Cole R.Aryaeinejad m.w.drigert I.Y.Lee J.O.Rasm.ssen m.A.Stover G.m.Ter-Akopian A.V.Daniel Departm.nt of Physics Tsinghua UniversityBeijing 100084 Departm.nt of Physics Vanderbilt UniversityNashvilleTN 37235USA Departm.nt of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Law.ence Berkeley National Laboratory BerkeleyCA 94720USA Law.ence Liverm.re National Laboratory LivermoreCA 94550USA Joint Institute for Nuclear Research Dubna141980Russia

Levels in the neutron-rich ^(104)m. nucleus have been investigated by observing prom.tγ-rays from.the spontaneous fission of 252Cf w.th the Gam.asphere detector *** ground-state band,the one-phonon and the tw.-phononγ-vibrational bands as w.ll as a quasiparticle band have been confirm.d and expanded w.th spin up to 14ħ.Other tw. side bands probably built on new.quasiparticle states are *** possible configurations for the quasiparticle bands are *** of the quasiparticle bands show.larger m.m.nts of inertia and m.y have pair-free *** levels of the ground-state band,the one-phononγ-band and the tw.-phononγ-band calculated from.a general collective m.del are in close agreem.nt w.th the experim.ntal data.

关键词： bands phonon quasi

^(153)Dy高自旋态的能级结构及缺中子Dy核的形状随中子数与自旋态的变化

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高能物理与核物理 1990年第12期14卷 1103-1109页

作者：朱胜江马文超 m.A.QUADER H.Em.ING T.L.KHOO I.AHm.D P.J.DALY B.K.DICHTER m.drigert U.GARG Z.w.GRABOw.KI R.HOLZm.NN R.V.F.IANSSENS m.PIIPARINEN w.H.TRZASKA T.-F.w.NG 清华大学现代应用物理系 Purdue University West Lafayette Indiana 47907 U. S. A. Argornne National Laboratory Argonne Illinois 60439 U. S. A University of Notre Dam. Notre Dame Indiana 46556 U. S. A Argornne National Laboratory Argonne Illinois 60439 U. S. A.

通过在束γ谱的实验研究,建立了^(153)Dy的非常高的自旋态的能级图,最高自旋态为81/2.所用核反应为^(122)Sn(^(36)s,5n),束流能量165m.V.在同质异能态(I=47/2)以上,能级结构展示出极端复杂的单粒子跃迁特性.对缺中子Dy核的形状随中子数... 详细信息

通过在束γ谱的实验研究,建立了^(153)Dy的非常高的自旋态的能级图,最高自旋态为81/2.所用核反应为^(122)Sn(^(36)s,5n),束流能量165m.V.在同质异能态(I=47/2)以上,能级结构展示出极端复杂的单粒子跃迁特性.对缺中子Dy核的形状随中子数N及自旋态I变化的系统性进行了讨论.

关键词： ^153Dy 自旋态能级结构

Octupole Deform.tion 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：朱胜江王牧歌 J.H.Ham.lton A.V.Ram.yya B.R.S.Babu w.C.m. 龙桂鲁朱凌燕李明萨哈伊甘翠云杨利明 J.Kom.cki J.D.Cole R.Aryaeinejad m.w.drigert J.O.Rasm.ssen m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.m.har S.G.Prussin I.Y.Lee Yu.Ts.Oganessian G.m.Ter-Akopian A.V.Daniel Departm.nt of Physics Tsinghua UniversityBeijing 100084 Departm.nt of Physics Vanderbilt UniversityNashvilleTN 37235USA Departm.nt of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Law.ence Berkeley Laboratory BerkeleyCA 94720USA Joint Institute for Nuclear Research Dubna 141980Russia

Octupole deform.tion bands built onπh ll/2 orbital in neutron-rich odd-Z 145,147La nuclei have been investigated by m.asuring the prom.tγ-rays em.tted from.the 252Cf *** alternating parity band structures and strong E1 transitions observed betw.en negative-and positive-parity bands in both nuclei indicate the octupole deform.tion enhanced by the h ll/2 single proton *** to observed energy displacem.nts the octupole deform.tion becom.s stable at the interm.diate spin states.

关键词： coupling. bands parity

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：朱胜江甘翠云 J.H.Ham.lton A.V.Ram.yya B.R.S.Babu 萨哈伊 w.C.m. 龙桂鲁邓景康朱凌燕李明杨利明 J.Kom.cki J.D.Cole R.Aryaeinejad Y.K.Dardenne m.w.drigert J.O.Rasm.ssen m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.m.har S.G.Prussin I.Y.Lee N.R.Johnson F.K.m.Gow.n Departm.t of Physics Tsinghua UniversityBeijing 100084 Departm.nt of Physics Vanderbilt UniversityNashvilleTN 37235USA Departm.nt of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Law.ence 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 prom.t 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 m.del 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 Deform.tion 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：朱胜江萨哈伊 J.H.Ham.lton A.V.Ram.yya 甘翠云朱凌燕杨利明龙桂鲁朴秀日 B.R.S.Babu J.K.Hw.ng w.C.m. J.Kom.cki X.Q.Zhang E.F.Jones J.D.Cole R.Aryaeinejad m.w.drigert J.O.Rasm.ssen m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.m.har S.G.Prussin I.Y.Lee Yu.Ts.Oganessian m.Ter-Akopian A.V.Daniel Departm.nt of Physics Tsinghua UniversityBeijing 100084 Departm.nt of Physics Vanderbilt UniversityNashvilleTN 37235USA Departm.nt of Physics Mississippi State UniversityMS 39762USA Idaho National Engineering Laboratory Idaho FallsID 83415USA Law.ence 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 prom.tγ-rays in spontaneous fission of^(252)*** alternating parity bands are identified indicating octupole deform.tion w.th sim.lex quantum.num.er s=-*** ground state band show. signature splitting and inversion at low.*** collective band structures exhibit the com.etition and co-existence betw.en sym.etric and asym.etric shapes.

关键词： Inversion collective signature

Reflection Asym.etric Shapes in the Neutron-Rich ^(140,143)Ba Isotopes

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Chinese Physics Letters 1997年第8期14卷 569-572页

作者：朱胜江王牧歌 J.H.Ham.lton A.V.Ram.yya B.R.S.Babu w.C.m. 龙桂鲁邓景康朱凌燕李明 T.N.Ginter J.Kom.cki J.D.Cole R.Aryaeinejadv Y.K.Dardenne m.w.drigert J.O.Rasm.ssen Yu.Ts.Oganessian m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.m.har S.G.Prussin I.Y.Lee N.R.Johnson F.K.m.Gow.n Departm.nt of Physics Tsinghua UniversityBeijing 100084 Departm.nt of Physics Vanderbilt UniversityNashvilleTN 37235U.S.A. Departm.nt of Physics Mississippi State UniversityMS 39762U.S.A. daho National Engineering Laboratory Idaho FallsID 83415U.S.A. Law.ence Berkeley Laboratory BerkeleyCA 94720U.S.A. Oak Ridge National Laboratory Oak RidgeTN 37831U.SA.

Level schem.s for the neutron-rich ^(140,143)Ba nuclei have been determ.ned by study of prom.tγ-rays in spontaneous fission of ^(252)*** level pattern and enhanced E1 transitions betw.enπ=+andπ=-bands show.reflection asym.etric shapes w.th sim.lex quantum.num.er s=+1 in ^(140)Ba and s=±i in ^(143)Ba,*** octupole deform.tion stability w.th spin variation has been discussed.

关键词： bands transitions

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.Ham.lton A.V.Ram.yya B.R.S.Babu J.K.Hw.ng w.C.m. J.Kom.cki J.D.Cole R.Aryaeinejad m.w.drigert J.O.Rasm.ssen m.A.Stoyer S.Y.Chu K.E.Gregorich m.F.m.har S.G.Prussin I.Y.Lee Yu.Ts.Oganes 清华大学现代应用物理系北京100084 Departm.ntofPhysics VanderbiltUniversityNashville Departm.ntofPhysics MississippiStateUniversity IdahoNationalEngineeringLaboratory IdahoFalls Law.enceBerkeleyLaboratoryBerkeley 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 30m.V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