Beta decay of medium and high spin isomers in "9"4Ag

Abstract

The very neutron-deficient isotope "9"4Ag was produced at the GSI on-line mass separator by using the reaction "5"8Ni("4"0Ca,p3n). The #beta#-decay properties of "9"4Ag were studied by detecting for the first time #beta#-delayed #gamma# rays and #beta#-#gamma#-#gamma# coincidences. Both the population of excited levels in the daughter nucleus "9"4Pd and the #beta#-decay half-life of "9"4Ag were investigated. The major part of the feeding was assigned to the decay of an I"#pi#=(7"+) isomer with a half-life of (0.36#+-#0.03) s. A weak #beta#-decay branch was found to populate high-spin levels in the "9"4Pd daughter with I#>=#18. It is tentatively assigned to the decay of a high-spin parent state in "9"4Ag with I#>=#17 and a half-life (0.3#+-#0.2) s. The measured #beta#-decay properties as well as the level structure of "9"4Ag and "9"4Pd are discussed in comparison with shell-model predictions. (orig.)SIGLEAvailable from TIB Hannover: RO 801(2002-19) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman