Yrast decays in 87,89Zr, 87,88,89,90Y and 86Sr from 74,76Ge(18O,xn,yp,zαγ) reactions

Gamma-ray data from 74,76Ge+18O fusion-evaporation reactions are analysed to provide data on yrast decay schemes in 87,89Zr, 87,88,89,90Y and 86Sr. The data include excitation functions, angular distributions, gamma - gamma coincidences, linear polarisation measurements and lifetimes deduced from both Doppler shift attenuation and recoil distance measurements. Shell-model calculations are presented for 88,90Y and 86Sr.