Excited states in the neutron-rich \nuc{ 70}{ Fe} nucleus were populated in a one-proton removal reaction from \nuc{ 71}{ Co} projectiles at 87~MeV/nucleon. A new transition was observed with the $\gamma$-ray tracking array GRETINA and shown to feed the previously assigned $4^+_1$ state. In comparison to reaction theory calculations with shell-model spectroscopic factors, it is argued that the new $\gamma$ ray possibly originates from the $6^+_1$ state. It is further shown that the Doppler-reconstructed $\gamma$-ray spectra are sensitive to the very different lifetimes of the $2^+$ and $4^+$ states, enabling their approximate measurement. The emerging structure of \nuc{ 70}{ Fe} is discussed in comparison to LNPS-new large-scale shell-model calculations.
Categories: nucl-ex