~(80)Rb的旋称劈裂反转和回弯

详细信息    查看官网全文

• 英文论文题名：Signature splitting inversion and backbending in ~(80)Rb
• 论文作者：沈水法 ; 贺创业 ; 温书贤 ; FDS团队
• 英文论文作者：SHEN Shui-fa ; HE Chuang-ye ; WEN Shu-xian ; Key Laboratory of Neutronics and Radiation Safety ; Institute of Nuclear Energy Safety Technology ; Chinese Academy of Sciences ; China Institute of Atomic Energy
• 年：2015
• 作者机构：中国科学院核能安全技术研究所中国科学院中子输运理论与辐射安全重点实验室;中国原子能科学研究院;
• 论文关键词：高自旋态 ; 回弯 ; 转晕带 ; 旋称劈裂反转 ; 投影壳模型
• 英文论文关键词：high-spin state ; backbending ; yrast band ; signature splitting inversion ; projected shell model
• 会议召开时间：2015-09-21
• 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第7册（计算物理分卷、核物理分卷、粒子加速器分卷、核聚变与等离子体物理分卷、脉冲功率技术及其应用分卷、辐射物理分卷）
• 语种：中文
• 分类号：O571
• 学会代码：EGVD
• 会议名称：中国核学会2015年学术年会
• 会议地点：中国四川绵阳
• 主办单位：中国核学会
• 学会名称：中国核学会
• 页数：4
• 文件大小：185k
• 原文格式：O
• 会议级别：全国

摘要

通过熔合蒸发反应~(65)Cu+~(19)F,~(66)Zn+~(18)O及~(68)Zn+~(16)O,在入射束流能量分别为75 MeV,76 MeV及80 MeV,研究了~(80)Rb高自旋态的能级结构。增加了20多条新的γ跃迁,在已知的第一个负宇称带上建立了两条新的边带。第二条负宇称带的(=0序列在频率为0.51 MeV和0.61 MeV处有带交叉,(=1序列在频率为0.54 MeV处有带交叉;第一个负宇称带在16-h时出现了旋称反转,第二负宇称带存在明显的旋称劈裂,但没有观测到旋称反转,这两条负宇称带的结构均与其同中子数核~(82)Y非常相似。正宇称转晕带在投影壳模型框架下作了讨论。
High-spin states of ~(80)Rb are studied via the fusion-evaporation reactions ~(65)Cu+~(19)F,~(66)Zn+~(18)O,and ~(68)Zn+~(16)O with the beam energies of 75 MeV,76 MeV and 80 MeV,respectively.Twenty-three states with twenty-eight γ transitions are added to the previously proposed level scheme,where the second negative-parity band is significantly pushed up to spins of 22~ and 15~and two sidebands are built on the known first negative-parity band.Two consecutive band crossings with frequencies 0.51 and 0.61 MeV at the(= 0 branch as well as another one with frequency of0.54 MeV at the(= 1 branch of the second negative-parity band are observed.Signature inversions occur in the positive-parity and first negative-parity bands at the spins of 11 h and 16 h,respectively.The signature splitting is seen obviously in the second negative-parity band,but the signature inversion is not observed.It is also found that the structure of the two negative-parity bands is similar to that of its isotone ~(82)Y.Signature inversion in the positive-parity yrast band with configuration πg_(9/2)(?)νg_(9/2) in this nucleus is discussed using the projected shell model.

引文

[1]A.Harder,M.K.Kabadiyski,K.P.Lieb,D.Rudolph,C.J.Gross,R.A.Cunningham,F.Hannachi,J.Simpson,D.D.Warner,H.A.Roth,O.Skeppstedt,W.Gelletly,and B.J.Varley,Phys.Rev.C51,2932(1995).
    [2]R.A.Kaye,J.Doring,J.W.Holcomb,G.D.Johns,T.D.Johnson,M.A.Riley,G.N.Sylvan,P.C.Womble,V.A.Wood,S.L.Tabor,and J.X.Saladin,Phys.Rev.C54,1038(1996).
    [3]E.Landulfo,D.F.Winchell,J.X.Saladin,F.Cristancho,D.E.Archer,J.Doring,G.D.Johns,M.A.Riley,S.L.Tabor,V.A.Wood,S.Salem-Vasconcelos,and O.Dietzsch,Phys.Rev.C54,626(1996).
    [4]S.D.Paul,H.C.Jain,S.Chattopadhyay,M.L.Jhingan,and J.A.Sheikh,Phys.Rev.C51,2959(1995).
    [5]S.K.Tandel,S.B.Patel,R.K.Bhowmik,A.K.Sinha,S.Muralithar,and N.Madhavan,Nucl.Phys.A632,3(1998).
    [6]Chuangye He,Shuifa Shen,Shuxian Wen et al.Phys.Rev.C87,034320(2013).
    [7]R.Palit,J.A.Sheikh,Y.Sun,and H.C.Jain,Phys.Rev.C 67,014321(2003).
    [8]J.-Y.Zhang,N.Xu,D.B.Fossan,Y.Liang,R.Ma,and E.S.Paul,Phys.Rev.C39,714(1989).
    [9]A.Bohr and B.R.Mottelson,in Nuclear Structure,Vol.1(Benjamin,New York,1969),p.169.
    [10]P.Moller,J.R.Nix,W.D.Myers,and W.J.Swiatecki,At.Data and Nucl.Data Tables 59,185(1995).
    [11]M.A.Cardona,G.Garcia Bermudez,R.A.Kaye,G.Z.Solomon,and S.L.Tabor,Phys.Rev.C 61,044316(2000).
    [12]W.Satula,R.Wyss,and P.Magierski,Nucl.Phys.A 578,45(1994).
    [13]W.Satula and R.Wyss,Phys.Scr.T56,159(1995).