High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton...High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton 1/2^(+)[660] band.This new band and the 1/2^(+)[660] band in ^(171)Ta from the early work are classified as superdeformed bands with triaxiality.展开更多
High-spin states in the odd-proton nucleus^(135)pm have been investigated using the^(107)Ag(^(32)S,2p2n)^(135)pm reaction.Seven rotational bands have been observed in^(135)pm.The yrast band based on a decoupled h_(11/...High-spin states in the odd-proton nucleus^(135)pm have been investigated using the^(107)Ag(^(32)S,2p2n)^(135)pm reaction.Seven rotational bands have been observed in^(135)pm.The yrast band based on a decoupled h_(11/2)proton is found to have a band crossing in ω_(c)~0.43 MeV/h.Two positive-parity bands based on the two signature components of the πg_(7/2)5/2^(+)[413]Nilsson orbital have been observed in the main sidebands.The favoured band with(π,α)=(+,1/2)has been shown to populate below the first pair of proton alignment.Both bands have shown upbend at ω_(1)~0.26 MeV/h and ω_(2)~0.43 MeV/h.These crossing frequencies can be attributed to the decoupling of the first pair of h_(11/2) quasi-proton and h_(11/2) quasi-neutron,respectively.Four weaker bands have been observed in sidebands too.Among them,two states are possibly built on aπd_(5)/23/2^(+)[411]configuration.展开更多
Mean lifetimes of the h_(11/2) quasineutron band in 129Ce were measured by using the Doppler shift attenuation method in connection with the reaction ^(116)Sn(^(l6)O,3n)^(129)Ce at a bombarding energy of 73MeV.The dat...Mean lifetimes of the h_(11/2) quasineutron band in 129Ce were measured by using the Doppler shift attenuation method in connection with the reaction ^(116)Sn(^(l6)O,3n)^(129)Ce at a bombarding energy of 73MeV.The data indicate that transition quadrupole moment of ^(129)Ce is smaller than that of 128Ce.This reduction in collectivity caused by the addition of an h_(11/2) neutron can be interpreted as due to triaxiality induced byγdriving effect.展开更多
Lifetimes of the high spin states in the negative parity band of ^(126)Ba were measured by using the Doppler shift attenuation method in conjunction with the reaction ^(116)Sn(^(16)O,2p4n)^(126) Ba at a beam energy of...Lifetimes of the high spin states in the negative parity band of ^(126)Ba were measured by using the Doppler shift attenuation method in conjunction with the reaction ^(116)Sn(^(16)O,2p4n)^(126) Ba at a beam energy of 73 MeV.This band shows a typically collective behavior and possesses a near-axial prolate shape with a deformation parameter β_(2)=0.27±0.01 and triaxiality γ~-5°.展开更多
基金Supported by the National Natural Science Foundation of Chinathe Science Foundation of Nuclear Industry of China.
文摘High spin states of the odd-proton nucleus ^(167)Lu have been studied via ^(152)Sm(^(19)F,4n)^(167)Lu reaction at 87MeV beam energy.A weakly populated new rotationa1 band has been observed and assigned as i13/2 proton 1/2^(+)[660] band.This new band and the 1/2^(+)[660] band in ^(171)Ta from the early work are classified as superdeformed bands with triaxiality.
基金Supported by the National Natural Science Foundation of China under Grant No.19635030the Science Foundation of the Nuclear Industry of China。
文摘High-spin states in the odd-proton nucleus^(135)pm have been investigated using the^(107)Ag(^(32)S,2p2n)^(135)pm reaction.Seven rotational bands have been observed in^(135)pm.The yrast band based on a decoupled h_(11/2)proton is found to have a band crossing in ω_(c)~0.43 MeV/h.Two positive-parity bands based on the two signature components of the πg_(7/2)5/2^(+)[413]Nilsson orbital have been observed in the main sidebands.The favoured band with(π,α)=(+,1/2)has been shown to populate below the first pair of proton alignment.Both bands have shown upbend at ω_(1)~0.26 MeV/h and ω_(2)~0.43 MeV/h.These crossing frequencies can be attributed to the decoupling of the first pair of h_(11/2) quasi-proton and h_(11/2) quasi-neutron,respectively.Four weaker bands have been observed in sidebands too.Among them,two states are possibly built on aπd_(5)/23/2^(+)[411]configuration.
基金Supported by the National Natural Science Foundation of China under Grant No.19675067the Science Foundation'of Nuclear Industry of China under Grant No.H7196A0115。
文摘Mean lifetimes of the h_(11/2) quasineutron band in 129Ce were measured by using the Doppler shift attenuation method in connection with the reaction ^(116)Sn(^(l6)O,3n)^(129)Ce at a bombarding energy of 73MeV.The data indicate that transition quadrupole moment of ^(129)Ce is smaller than that of 128Ce.This reduction in collectivity caused by the addition of an h_(11/2) neutron can be interpreted as due to triaxiality induced byγdriving effect.
基金Supported by the National Natural Science Foundation of China under Grant No.19675067the Science Foundation of Nuclear Industry of China under Grant No.H7196A0115.
文摘Lifetimes of the high spin states in the negative parity band of ^(126)Ba were measured by using the Doppler shift attenuation method in conjunction with the reaction ^(116)Sn(^(16)O,2p4n)^(126) Ba at a beam energy of 73 MeV.This band shows a typically collective behavior and possesses a near-axial prolate shape with a deformation parameter β_(2)=0.27±0.01 and triaxiality γ~-5°.
