Étude de la désintégration radioactive de 187Au: Existence de transitions E0 dans 187Pt?

The decay 187 Au → 187 Pt has been studied using on-line mass-separated sources produced at ISOCELE (ORSAY) and ISOLDE (CERN). Lifetime measurements were performed with a Gerholm spectrometer and precise conversion electron determination with a 180° spectrograph. A decay scheme is proposed. Low-lying low-spin states in 187 Pt are discussed. Special attention is given to four highly converted transitions (260.3, 262.5, 498.2 and 498.8 keV) which are tentatively considered to have large E0 components.