Medium-spin levels and the character of the 20.4 ns isomer in 145Gd |
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Authors: | A Pakkanen J Muhonen M Piiparinen J Blomqvist |
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Institution: | 1. Department of Physics, University of Jyväskylä, Jyväskylä, Finland;2. Research Institute of Physics, Stockholm, Sweden |
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Abstract: | Levels of the N = 81 nucleus 145Gd have been investigated by in-beam γ-ray and conversion electron spectroscopy with the 144Sm(3He, 2n) reaction. Fourteen new low- and medium-spin states between 1.0 and 2.4 MeV excitation, the known yrast levels up to spin , five other high-spin non-yrast states and a new 20.4 ns isomer at 2200.2 keV in 145Gd have been observed. The isomer decays via a fast 927.3 keV E3 transition with B(E3) = 48 ± 7 W.u. Another weaker decay branch is a mixed, strongly hindered E1 + M2 + E3 transition to the state. We propose an octupole main configuration for the isomer, analogous to the 997 keV isomer in 147Gd. The levels of 145Gd are discussed on the basis of the spherical shell model. |
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Keywords: | Nuclear reactions |
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