Decay of the 4.2-min152Pm into levels of152Sm |
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Authors: | G Wirth N Kaffrell Dr K Chayawattanangkur G Herrmann K E Seyb |
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Institution: | 1. Institut für Kernchemie, Universit?t Mainz, Mainz, Germany 2. Office of Atomic Energy for Peace, Bangkok, Thailand
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Abstract: | After bombardments of enriched152Sm with 14-MeV neutrons, three isomers of125Pm reaction, have been observed with half-lives of 4.2±0.2 min, 7.5±0.2 min and 15.0±1.0 min. Sources of pure 4.2-min152Pm were obtained by separating the promethium from its parent 11-min152Nd produced by thermal-neutron induced fission of235U. The beta and gamma radiations of the 4.2-min152Pm have been investigated using semiconductor and scintillation spectrometers. Most of theγ-ray transitions could be placed in a level scheme for 152Sm. Especially interesting is a level at 1083 keV for which the assignmentI π=0+ is proposed. In a 4πβγ experiment, the ground state feeding of152Sm in theβ ?-decay of the 4.2-min152Pm has been measured to be 61% of allβ-ray transitions. AQ β-value of 3.4±0.2 MeV has been obtained. |
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