Internal-Conversion-Electron Study of the Decay ofBa133toCs133
- 20 July 1967
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 159 (4), 955-968
- https://doi.org/10.1103/physrev.159.955
Abstract
The 40- to 500-keV region of the internal-conversion-electron spectrum from the decay of has been investigated with an iron-core, double-focusing spectrometer. Transitions of 383.79(7), 355.92(6), 302.78(5), 276.35(5), 223.15(5), 160.58(4), 80.990(22), 79.622(18), and 53.152(20) keV have been observed, and their multipolarities have been determined from measurements of the conversion-electron intensity ratios— and/or . No new lines with intensity greater than 2.3% of the line were found. The line was found to have an intensity less than 0.01% of the line. The multipolarities obtained for the nine observed transitions were compared with previous measurements of and angular correlations. This comparison resulted in unique spin-parity assignments of , , , , and for the ground state and the 80.997(6)-, 160.58(4)-, 383.79(7)-, and 436.93(6)-keV levels, respectively, in . The measurements of and for the 161-keV transition are consistent with previous 276-161 directional-correlation measurements only if penetration effects are included with a value of 45±10 or 180±20, where is defined as the ratio of the penetration matrix element to the normal -ray matrix element.
Keywords
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