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

Measurements of Electromagnetic Transition Probabilities in⁹⁰Mo

China Insitute of Atomic Energy, Beijing 102413, China

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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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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 in⁹⁰Mo

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 of⁹⁰Mo have been populated by the reaction⁵⁹Co(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 in⁹⁰Mo 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 in⁹⁰Mo

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