STRUCTURE OF THE NEUTRON RICH Ga AND Ge ISOTOPES OBSERVED AT ALTO

During test runs dedicated to the commissioning of ALTO (Accélérateur Linéaire et Tandem à Orsay), β and β- n decay of the very neutron rich [Formula: see text] could be observed at the tape station installed on-line with the PARRNe mass-separator. γ-lines observed in the resulting spectra and a careful analysis of the balance of their relative intensities point toward the existence of two β-decaying states in 84 Ga . The decay of these long-lived states appear to feed the [Formula: see text] and [Formula: see text] excited states of [Formula: see text] and the [Formula: see text] state in [Formula: see text] allowing a significant improvement of the knowledge on nuclear structure in the immediate vicinity of 78 Ni .