Abstract

Abstract The electron-capture and positon decay of 4.7 d Eu146 to levels in Sm146 has been investigated with scintillation counters, magnetic spectrometers and coincidence and directional-correlation techniques. The complex gamma-ray spectrum extends to 2940 keV, with the most prominent transitions being those of 635, 667, 704, 749, 902, 1061, 1300 and 1536 keV. Conversion electrons were studied with permanent-magnet spectrographs and an intermediate-image spectrometer. Levels in Sm146 have been firmly established at the following energies: 749 (2+), 1384(4+, 3−), 2051, 2286, 2684, 3160, 3202, and 3464 keV. A number of less firm levels are postulated on the basis of energy and intensity considerations. Positon branches of 2107, 1466 and 798 keV proceed to the levels at 749, 1384, and 2051 keV respectively. Directional-correlation measurements were carried out on the 635–749 keV gamma-ray cascade, but the results were ambiguous. A tabulation of the available energy-level data for the region of neutron number 82 to 88 is presented.

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