Coupling a proton and a neutron to the semidoubly magic nucleusNi68: A study ofCu

Abstract

The 70 Ni nucleus has been produced at the LISOL facility and its ␤ decay to 70 Cu has been observed. In parallel, the 70

Coulomb excitation of the 3−isomer in70Cu

“…The isomeric beams were produced in a similar way as in Refs. [2][3][4]15], where narrow-band laser scans provided the optimum values of the laser frequency that maximize the ionization of the different isomers [17]. The 6 − and 3 − beams of 70 Cu, post-accelerated by the radioactive beam experiment (REX) at ISOLDE [18] up to 2.8 MeV/nucleon, were used to bombard a 120 Sn 2.3 mg/cm 2 target inducing Coulomb excitation.…”

“…According to the shell-model calculations presented in Ref. [3], however, the lowest 3 − to 6 − states in 70 Cu have a dominant π 2p 3/2 ν1g 9/2 component, corresponding to more than 52% contribution in the total wave function. For this reason, in the rest of the text and for simplicity, we will refer to the 3 − to 6 − multiplet as belonging to this configuration.…”

“…been subject to several experimental, e.g., Refs. [1][2][3][4][5][6][7][8], and theoretical papers, e.g., Refs. [9][10][11].…”

“…These structures induce isomerism like the triplet of β-decaying states in 70 Cu as the most notorious example [2,3]. The other members of these multiplets in 68,70 Cu were tentatively identified using nucleon-transfer reactions [14], mass measurements, and β-decay studies [2,3].…”

“…The other members of these multiplets in 68,70 Cu were tentatively identified using nucleon-transfer reactions [14], mass measurements, and β-decay studies [2,3]. These long-lived isomeric states were also investigated using laser spectroscopy [6,15], whereby the spin and parity were firmly fixed to 1 + , 3 − , and 6 − in the case of 70 Cu and 1 + and 6 − in case of 68 Cu.…”