High-spin states in^(189)Pt are populated through the heavy-ion fusion-evaporation reaction^(176)Yb(18O,5n)^(189)Pt at 87 MeV beam energy.An array consisting of 13 HPGe detectors is used in conjunction with the plunge...High-spin states in^(189)Pt are populated through the heavy-ion fusion-evaporation reaction^(176)Yb(18O,5n)^(189)Pt at 87 MeV beam energy.An array consisting of 13 HPGe detectors is used in conjunction with the plunger device in CIAE.The lifetimes of two levels in the yrast band are determined by using the recoil distance Doppler shift method.The transition quadrupole moments Qt are extracted.The results show that the 17+/2 state has a much larger Qt value than that of the ground state,whereas the value deceases quickly with spin increasing.This may contribute to the shape driving effect of the quasi-neutron from the i_(13/2)orbital.展开更多
The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number...The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number of low-lying states are constructed.The level states in theπh_(11/2)νg_(7/2) side band are extended down to lower spin by one h.The level energies and spins in the rotational bands are determined through the establishment of various connections,which confirm the spin assignment of the yrast band in ^(124)Cs based on excitation energy systematics.It is revealed that with the present spin assignment,theπh_(11/2)νg_(7/2) side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 11175259,11075214 and 10927507.
文摘High-spin states in^(189)Pt are populated through the heavy-ion fusion-evaporation reaction^(176)Yb(18O,5n)^(189)Pt at 87 MeV beam energy.An array consisting of 13 HPGe detectors is used in conjunction with the plunger device in CIAE.The lifetimes of two levels in the yrast band are determined by using the recoil distance Doppler shift method.The transition quadrupole moments Qt are extracted.The results show that the 17+/2 state has a much larger Qt value than that of the ground state,whereas the value deceases quickly with spin increasing.This may contribute to the shape driving effect of the quasi-neutron from the i_(13/2)orbital.
基金Supported by the National Natural Science Foundation of China under Grant No.19775019.
文摘The level states of the nucleus ^(124)Cs have been populated through the ^(116)Sn(^(11) B,3n)reaction at a beam energy of 45MeV,provided by the HI-13 tandem accelerator of the China Institute of Atomic Energy.A number of low-lying states are constructed.The level states in theπh_(11/2)νg_(7/2) side band are extended down to lower spin by one h.The level energies and spins in the rotational bands are determined through the establishment of various connections,which confirm the spin assignment of the yrast band in ^(124)Cs based on excitation energy systematics.It is revealed that with the present spin assignment,theπh_(11/2)νg_(7/2) side band shows signature inversion at low-spin region and the inversion occurs at a spin of about 16h.
