Measurements of Electromagnetic Transition Probabilities in <SUP>90</SUP>Mo

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; ZHU Li-Hua

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

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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.

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Received: 2002-04-12
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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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Measurements of Electromagnetic Transition Probabilities in ⁹⁰Mo

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Measurements of Electromagnetic Transition Probabilities in ⁹⁰Mo

Measurements of Electromagnetic Transition Probabilities in ⁹⁰Mo