The level schemes of Sr and Y isotopes in the mass chains A = 95, 97 and 99

The fission product separator Ostis at the Institute Laue-Langevin at Grenoble (France) was used for the investigation of the β-decays and the level schemes of short-lived Rb, Sr and Y isotopes with A = 95, 97 and 99. The studies in the mass chains 95 and 97 were made using a surface ionization source to provide Rb isotopes whereas the mass chain 99 was investigated using an high temperature ion source. The study of these nuclei close to 98Sr and 100Zr where a shape coexistence was evidenced is of great interest. Single γ-ray and conversion electron spectra, and prompt and delayed γ-γ and β-γ coincidences were measured. The level schemes of 95Sr, 95Y, 97Sr and 97Y were established or extended and a preliminary level scheme is given for 99Y. (orig.)