Neutron-rich isotopesTi54−57

The neutron-rich isotopes ${}_{}{}^{54\mathrm{-}57}{}_{}{}^{}\mathrm{Ti}$ and ${}_{}{}^{58\mathrm{-}60}{}_{}{}^{}\mathrm{Cr}$ are produced by fragmentation of a 64.5 MeV/nucleon ${}_{}{}^{65}{}_{}{}^{}\mathrm{Cu}_{}^{26+}{}_{}{}^{}$ beam in a 90 mg/${\mathrm{cm}}^2$ ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ target. Following particle identification by energy loss and time of flight, the radioactive decay was observed by β singles and βγ-coincidence measurements. The results obtained for ${}_{}{}^{58\mathrm{-}60}{}_{}{}^{}\mathrm{Cr}$ are compared to previous results, whereas the decay of the ${}_{}{}^{54\mathrm{-}57}{}_{}{}^{}\mathrm{Ti}$ isotopes is studied here. γ-ray intensities and energies are estimated. The new experimental results are compared to quasi-random-phase-approximation predictions. © 1996 The American Physical Society.