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

查看全文 作　　者：[1]朱胜江;[1]王牧歌;[2]J.H.Hamilton;[2]A.V.Ramayya;[2]B.R.S.Babu;[3]W.C.Ma;[1]龙桂鲁;[1]朱凌燕;[1]李明;[1]萨哈伊;[1]甘翠云;[1]杨利明;[2]J.Komicki;[4]J.D.Cole;[4]R.Aryaeinejad;[4]M.W.Drigert;[5]J.O.Rasmussen;[5]M.A.Stoyer;[5]S.Y.Chu;[5]K.E.Gregorich;[5]M.F.Mohar;[5]S.G.Prussin;[5]I.Y.Lee;[6]Yu.Ts.Oganessian;G.M.Ter-[6]Akopian;[6]A.V.Daniel 机构地区：[1]Department of Physics,Tsinghua University,Beijing 100084;[2]Department of Physics,Vanderbilt University,Nashville,TN 37235,USA;[3]Department of Physics,Mississippi State University,MS 39762,USA;[4]Idaho National Engineering Laboratory,Idaho Falls,ID 83415,USA;[5]Lawrence Berkeley Laboratory,Berkeley,CA 94720,USA;[6]Joint Institute for Nuclear Research,Dubna 141980,Russia 出　　处：《Chinese Physics Letters》索引1999年第16卷第3期,共3页 基　　金：Supported by the National Natural Science Foundation of China under Grant No.19775026;the Science Foundation for Nuclear Industry of China under Grant No.Y7197AY509;the U.S.Department of Energy under Grant Nos.DE-FG05-88ER40407 and DE-FG03-87ER40323. 摘　　要：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 source.The 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 coupling.According to observed energy displacements the octupole deformation becomes stable at the intermediate spin states. 关 键 词：coupling. BANDS PARITY