Probing collectivity in Zn isotopes with one particle or hole outside the N = 40 subshell closure
Résumé
The nuclear structure of the odd-mass $^{69}$Zn and $^{71}$Zn isotopes, with one hole or one particle outside the N = 40
subshell closure, has been investigated by measuring the lifetime of excited states using the recoil distance
Doppler-shift method. The nuclei of interest were produced in a deep-inelastic reaction in inverse kinematics
with a $^{238}$U beam impinging on a $^{70}$Zn target. Single-particle and collective states were found to coexist at low
energy in $^{69}$Zn and $^{71}$Zn.