Lifetime measurements of high-spin states in ${}^{101}\mathrm{Ag}$ and their interpretation in the interacting boson fermion plus broken pair model

Lifetimes of some 20 high-spin states in ${}^{101}\mathrm{Ag}$ in the range between 0.2 and 200 ps have been measured using various Doppler shift techniques. The states have been populated in the reaction ${}^{58}\mathrm{Ni}{(}^{50}\mathrm{Cr},\alpha 3p)$ at 200–205 MeV beam energy and their decays observed by means of the GASP array. For many states, the problem of their unknown side-feeding times has been circumvented by using the DDCM and NGTB $\gamma \gamma$-coincidence methods. A total of some 60 reduced transition strengths or limits of them has been deduced. Moderately enhanced electric quadrupole transitions (up to 30 W.u.) have been derived as well as rather strong stretched magnetic dipole transitions within the negative parity yrast sequence (0.2–0.7) W.u. An attempt has been made to interpret the level energies and electromagnetic transitions within the interacting boson fermion plus broken pair model.