Level schemes of the extremely neutron rich isotopes, 141 Xe, 152 Ce and 160 Sm are identified for the first time using γ γ, γ γ γ, X γ( and X X coincidence ex...Level schemes of the extremely neutron rich isotopes, 141 Xe, 152 Ce and 160 Sm are identified for the first time using γ γ, γ γ γ, X γ( and X X coincidence experiments through measuring prompt γ rays from spontaneous fission of 252 Cf. Two collective band structures are observed in 141 Xe that most probably belong to octupole deformation. The yrast bands up to 16 + in 152 Ce and 14 + in 160 Sm demonstrated well deformed character. Two side bands in 152 Ce are tentatively assigned as octupole vibrational rotational bands with K=1 - and 2 - respectively. The behavior of J 1 with h- ω in Ce and Sm isotope chains is also discussed.展开更多
基金Supported by the National Natural Scie-nce Foundation of China and the Science
文摘Level schemes of the extremely neutron rich isotopes, 141 Xe, 152 Ce and 160 Sm are identified for the first time using γ γ, γ γ γ, X γ( and X X coincidence experiments through measuring prompt γ rays from spontaneous fission of 252 Cf. Two collective band structures are observed in 141 Xe that most probably belong to octupole deformation. The yrast bands up to 16 + in 152 Ce and 14 + in 160 Sm demonstrated well deformed character. Two side bands in 152 Ce are tentatively assigned as octupole vibrational rotational bands with K=1 - and 2 - respectively. The behavior of J 1 with h- ω in Ce and Sm isotope chains is also discussed.
