Decay of 153Sm (47h) to 153Eu

Abstract

The decay of 153Sm (47h) to excited states in 153Eu has been studied with a lithium-drifted germanium detector and a scintillation spectrometer. Singles and coincidence spectra were obtained. The energies and relative photon intensities of the previously reported transitions of 103.18, 151.49, 172.85, 412.1, 424.3, 437.3, 463.6, 521.3, 531.4, 533.2, 539.2, 554.7, 578.5, 596.7, 603.0, 609.1 and 636.2 keV were obtained. The energies and relative photon intensities of hitherto unreported transitions of 481, 485, 509.2, 584.2, 615.9, 657.7, 683, 713 and 760 keV were determined. The present data are consistent with a level scheme with states at 83.37 keV ( 7 2 +) , 97.45 keV ( 5 2 −) , 103.18 keV ( 3 2 +) , 151.5 keV ( 7 2 −) , 172.85 keV ( 5 2 +) , 585 keV ( 3 2 +) , 589 keV ( 5 2 −) , 597 keV ( 1 2 +) , 604 keV ( 5 2 +) , 634.6 keV ( 1 2 +) , 636.4 keV ( 3 2 +) , 658 keV ( 3 2 +) , 683 keV ( 5 2 +) , 712 keV ( 3 2 −) and 760 keV ( 5 2 +) . The log ft values for transitions to these levels were obtained. Ratios of experimental gamma-ray transition probabilities from the 712, 683, 658, 636.4 and 172.85 keV states are presented. All gamma-ray transitions have been placed into a consistent d decay scheme which may be treated in terms of the Nilsson model.