Internal-Conversion-Electron Study of the Decay ofBa133toCs133

Abstract

The 40-to 500-keV region of the internal-conversion-electron spectrum from the decay of Ba 133 has been investigated with an iron-core, 7rV2 double-focusing spectrometer. 53.152(20) keVhave been observed, and their multipolarities have been determined from measurements of the conversion-electron intensity ratios-Li/Lt/Lz and/or K/L. No new lines with intensity greater than 2.3% of the 356K line were found. The 437K line was found to have an intensity less than 0.01% of the 356K line. The multipolarities obtained for the nine observed transitions were compared with previous measurements of ax and 7-7 angular correlations. This comparison resulted in unique spin-parity assignments of J + , | + , § + , f + , and | + for the ground state and the 80.997 (6)-, 160.58 (4)-, 383.79 (7)-, and 436.93 (6)-keV levels, respectively, in Cs 133 . The measurements of K/Ls and L1/L3 for the 161-keV transition are consistent with previous 276-161 7-7 directionalcorrelation measurements only if penetration effects are included with a X value of 45±10 or 180±20, where X is defined as the ratio of the penetration matrix element to the normal 7-ray matrix element.

Innere Konversion der 161 keV- und 223 keV-Übergänge in133Cs

“…Nach der Methode der kleinsten Abweichungsquadrate wurde eine Funktion der Form 100 G (E,) = exp A~ E~ (9) angepagt, die als ausgezogene Linie eingetragen ist. [20] fiir 152Sm, 152Gd und yon Hennecke et al [21] fiir aaaCs zur Verfiigung.…”