BETA-VIBRATIONAL BAND IN 152SM

The intensities of the γ rays (444.1-, 563.9-, 656.1-, 688.0-, and 810.5-keV) between the various levels of the β-vibrational band and the ground-state rotational band of Sm152 are measured from an analysis of high-resolution (2.6-keV) γ-ray spectra of the 98%-enriched 12.4-yr Eu152 decay. Upper limits of the intensities of the 4β+→6+ and 4β+→2+ transitions are also given. From the αk of the 444.1-keV transition, the 2β+→4+ branching is shown to be less than 5% of the total 444.1-keV γ intensity. A small but definite broadening of the 810.5-keV photopeak is observed. From these observations it is concluded that the reported B (E2) ratios for these transitions may have to be changed considerably. © 1969 The American Physical Society.