Energy levels of Ru 101 fed in the electron capture decay Rh 101m

Abstract

Gamma-gamma coincidences and internal conversion electrons observed in the decay of 101m Rh(Tx = 4.5 d) allow the establishment of transitions with energies (in keV): 127.08=[=0.08 (0.4±0.1), 182±2 (0.4±0.1), 232~7 (0.4±0.1), 234±5 (0.7~0.3), 306.79 ~ 0.07 (100), 359±7 (~ 0.4) and 541 ±5 (6±1). A level sequence of energies, 0, 127, 307, 359 and 541 keV with characterJstics ~+, ~+, ~ 7+, (.z, 3 ~) 5 and (.~, ~), respectively, is proposed. Two electron capture branches from the (9+) isomeric state of 101 Rh to the 307 keV and 541 keV levels, respectively, are consistent with the scheme. The isomeric transition of energy 157.26±0.03 keV has a K/L/M ratio of 100/31/8. In the decay of 101 Rh(~ 5 y) two transitions of energies 127.09±0.09 and 197.9~0.2 were detected.