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Chinese Physics C> 2003, Vol. 27> Issue(3) : 211-214 

Measurements of Electromagnetic Transition Probabilities in 90Mo

  •  China Insitute of Atomic Energy, Beijing 102413, China

  • High spin states of 90Mo have been populated by the reaction 59Co(35Cl,2p2n)90Mo at beam energy of 116 MeV. A detector array consisting of 10 anti-Compton HPGe detectors was used for γ-γ coincidence measurements. Lifetimes of high spin states in 90Mo are determined by analysing the Doppler-broadened line shapes. Enhanced M1 transitions are observed in the positive-parity decay sequence and oblate deformation is suggested above 13+ state. A appreciable staggering of E2 transition rates associated with large B(E2) values is found in the high spin states with negative-parity. Transitions between positive- and negative-parity states exhibit enhanced B (E1) values, looking like existence of octupole correlation. However,90Mo does not lie in the mass regions of nuclei possessing octupole deformation predicted by theories.
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LI Guang-Sheng, WU Xiao-Guang, PENG Zhao-Hua, WEN Shu-Xian, HAN Guang-Bing, LI Cheng-Bo, LU Shao-Jun, WU Shao-Yong, YUAN Guan-Jun, YANG Chun-Xiang and ZHU Li-Hua. Measurements of Electromagnetic Transition Probabilities in 90Mo[J]. Chinese Physics C, 2003, 27(3): 211-214.
LI Guang-Sheng, WU Xiao-Guang, PENG Zhao-Hua, WEN Shu-Xian, HAN Guang-Bing, LI Cheng-Bo, LU Shao-Jun, WU Shao-Yong, YUAN Guan-Jun, YANG Chun-Xiang and ZHU Li-Hua. Measurements of Electromagnetic Transition Probabilities in 90Mo[J]. Chinese Physics C, 2003, 27(3): 211-214. shu
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Received: 2002-04-12
Revised: 1900-01-01
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Measurements of Electromagnetic Transition Probabilities in 90Mo

    Corresponding author: LI Guang-Sheng,
  • China Insitute of Atomic Energy, Beijing 102413, China
  • Received Date: 2002-04-12
  • Accepted Date: 1900-01-01
  • Available Online: 2003-03-05

Abstract: High spin states of 90Mo have been populated by the reaction 59Co(35Cl,2p2n)90Mo at beam energy of 116 MeV. A detector array consisting of 10 anti-Compton HPGe detectors was used for γ-γ coincidence measurements. Lifetimes of high spin states in 90Mo are determined by analysing the Doppler-broadened line shapes. Enhanced M1 transitions are observed in the positive-parity decay sequence and oblate deformation is suggested above 13+ state. A appreciable staggering of E2 transition rates associated with large B(E2) values is found in the high spin states with negative-parity. Transitions between positive- and negative-parity states exhibit enhanced B (E1) values, looking like existence of octupole correlation. However,90Mo does not lie in the mass regions of nuclei possessing octupole deformation predicted by theories.

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