Nuclear Structure of
- 15 December 1960
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 120 (6) , 2185-2196
- https://doi.org/10.1103/physrev.120.2185
Abstract
The radiations from 5.8-day have been investigated in detail, using sector-type double-focusing magnetic spectrometers and scintillation counters. The following measurements were performed: coincident gamma-ray spectra, directional correlations of 1.18 Mev —1.03 Mev , 1.03 Mev —0.20 Mev , 1.18 Mev —0.20 Mev , 0.20 Mev —0.09 Mev , 0.20 Mev -0.09 Mev and 0.20 Mev —0.09 Mev . The 1.18 Mev —1.03 Mev polarization direction correlation, the conversion electron spectra, and the mean lives of the 2.41- and 2.50-Mev levels have also been investigated. The decay scheme of 5.8-day proposed by McGinnis, which gives the following assignments to the excited states in , 1.18 Mev(2+), 2.21 Mev(4+), 2.41 Mev(6+), and 2.50 Mev (7-), has been confirmed uniquely. These levels have been interpreted as arising from the neutron configurations and . The lifetimes of the 2.41-, 1.18-, and probably 2.21-Mev levels are shorter by a factor 3-4 than those expected for single-proton transitions and may be explained by the neutron transition, assuming a somewhat larger effective charge of neutron in spherical nuclei. The high forbiddenness of the 0.09-Mev transition is ascribable to the simultaneous - and -forbidden transition between the states involving and configurations.
Keywords
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