Discovery of a long-lived low-lying isomeric state inGa80

Abstract

Collinear laser spectroscopy was performed on the 80 Ga isotope at ISOLDE, CERN. A low-lying isomeric state with a half-life much greater than 200 ms was discovered. The nuclear spins and moments of the ground and isomeric states and the isomer shift are discussed. Probable spins and parities are assigned to both long-lived states (3 − and 6 − ) deduced from a comparison of the measured moments to shell-model calculations.

Collinear laser spectroscopy at ISOLDE: new methods and highlights

“…Only at 81 Ga, at N=50, does the ground state actually become 5/2 − . Also, a new isomeric state was observed in 80 Ga [66] and its beta-decay properties were recently measured at ISOLDE [78]. Laser spectroscopy was also well-placed to confirm the existence of and firmly assign spins to long-lived isomeric states in the Zn isotopes.…”

Review of metastable states in heavy nuclei

“…Thus, in the case of 80 Ga, measurements at ISOLDE enabled the discovery of a new isomer [478], whose excitation energy remains unknown but whose decay properties have since been studied in detail [479].…”

β-decay properties of the very neutron-rich isotopesGe86andAsMazzocchi1, Rykaczewski2, Grzywacz3 et al. 2015Phys. Rev. C8150View full textAdd to dashboardCite

“…Further investigations employed another set of interactions, which were constructed on the basis of jj44bpn [37] and jj45pna [30,35]. These were developed for the 56 Ni and 78 Ni cores, respectively.…”