Beta- and Gamma-Ray Spectroscopy of Mn52 and Mn52m

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Abstract
Excited levels of Cr 52 were studied by investigating the decays of Mn 52 (5.7 days) and Mn 52m (21 min), produced by Cr 52 ( d , 2 n )Mn 52,52m . By means of a two-directional focusing beta-ray spectrometer, NaI(TI) scintillation spectrometers and a 20-channel pulse height analyzer, following results were obtained: (1) Energies of the main three gamma-rays from Mn 52 are 746.8±0.2, 938.1±0.4 and 1434.7±0.8 keV. (2) The maximum energies of the positrons from Mn 52 and Mn 52m are 0.572±0.006 and 2.61±0.03 MeV, respectively. (3) The spins and parities of the levels of 3120, 2373 and 1435 keV were determined to be 6+, 4+ and 2+, from measurements of conversion electrons and angular correlations. (4) Several weak gamma-rays were found, which could be inferred to belong to these decays. (5) The half-life of Mn 52m is 21±1 min. Its branching ratio I T /(β + + E C ) was determined as 2±1 percent. (6) The energy of isomeric transition is 0.383±0.003 MeV, which was decided as E 4 from K / L + M and the transition probability.

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