High spin states in ^(137) Ce have been studied by using the heavy-ion induced reaction ^(124)Sn(^(18) O, 5n) carried out at China Institute of Atomic Energy. Partial level scheme with spin up to (43/2^(-)), including...High spin states in ^(137) Ce have been studied by using the heavy-ion induced reaction ^(124)Sn(^(18) O, 5n) carried out at China Institute of Atomic Energy. Partial level scheme with spin up to (43/2^(-)), including a high spin collective rotational band observed for the first time, has been established. The collective band shows the properties similar to those oblate bands with γ ~-60° in neighboring nuclei and probably originates from the five quasi-particle configuration νs_(1/2)■ [vh_(11/2)]^(2)π9_(7/2)■ πh_(11/2). The characteristics of this oblate band have been discussed.展开更多
High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.Th...High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.These two bands show oblate deformation withγ=-60°and probably originate from the four quasiparticle configurationsπg7/2πh11/2Uvh11/2 vd3/2 andπg7/2Uπh11/2[vh11/2]2,respectively.These oblate bands exhibit strong M1 transitions,no signature splitting and different moments of inertia from those of prolate bands.展开更多
High-spin states in ^(122)Ba have been investigated in the ^(107)Ag(^(19)F,4n)reaction by in-beamγ-ray spectroscopic methods.The ground-state band has been observed with spin up to 20ħand a negative-parity band is id...High-spin states in ^(122)Ba have been investigated in the ^(107)Ag(^(19)F,4n)reaction by in-beamγ-ray spectroscopic methods.The ground-state band has been observed with spin up to 20ħand a negative-parity band is identified with spin state up to 19ħ.A band-crossing in the yrast band is observed at a rotational frequency of ħω≈0.36 MeV and,in accordance with cranked shell model calculations,is interpreted as arising from the alignment of two h_(11/2) protons.Strong E1 transitions between the negative-parity and the yrast bands have been observed,which are proposed as possible evidence for octupole correlations.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No.19775026the Science Foundation for the Nuclear Industry of China under Grant No.Y7192AY509.
文摘High spin states in ^(137) Ce have been studied by using the heavy-ion induced reaction ^(124)Sn(^(18) O, 5n) carried out at China Institute of Atomic Energy. Partial level scheme with spin up to (43/2^(-)), including a high spin collective rotational band observed for the first time, has been established. The collective band shows the properties similar to those oblate bands with γ ~-60° in neighboring nuclei and probably originates from the five quasi-particle configuration νs_(1/2)■ [vh_(11/2)]^(2)π9_(7/2)■ πh_(11/2). The characteristics of this oblate band have been discussed.
基金the National Natural Science Foundation of China under Grant No.19775026the Science Foundation for the Nuclear Industry of China under Grant No.Y7192AY509.
文摘High spin states in 138Ce have been investigated following heavy-ion induced reactions carried out at the China Institute of Atomic Energy,Beijing.Two collective rotational bands were established for the first time.These two bands show oblate deformation withγ=-60°and probably originate from the four quasiparticle configurationsπg7/2πh11/2Uvh11/2 vd3/2 andπg7/2Uπh11/2[vh11/2]2,respectively.These oblate bands exhibit strong M1 transitions,no signature splitting and different moments of inertia from those of prolate bands.
基金Supported by the Major State Basic Research Development Program under Contract No.G2000077400the National Natural Science Foundation under Grant No.19975028the Science Foundation for Nuclear Indus try of China under Grant No.Y7197AY509.
文摘High-spin states in ^(122)Ba have been investigated in the ^(107)Ag(^(19)F,4n)reaction by in-beamγ-ray spectroscopic methods.The ground-state band has been observed with spin up to 20ħand a negative-parity band is identified with spin state up to 19ħ.A band-crossing in the yrast band is observed at a rotational frequency of ħω≈0.36 MeV and,in accordance with cranked shell model calculations,is interpreted as arising from the alignment of two h_(11/2) protons.Strong E1 transitions between the negative-parity and the yrast bands have been observed,which are proposed as possible evidence for octupole correlations.
