Abstract
Magnetic-dipole and electric-quadrupole moments for $^{65,67,69,75,79\text{--}82}\mathrm{Ga}$ are reported using the Collinear Resonance Ionization Spectroscopy (CRIS) technique at the ISOLDE facility, CERN. The moments of $^{65}\mathrm{Ga}$ have been measured for the first time: $\ensuremath{\mu}=+1.775(3)\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{\mathrm{N}}$ and ${Q}_{s}=+21.0(15)\phantom{\rule{4pt}{0ex}}e\phantom{\rule{0.16em}{0ex}}{\mathrm{fm}}^{2}$. These results are compared to shell-model calculations using the GXPF1 and JUN45 interactions and the trends of the moments approaching the region of the doubly magic $^{56}\mathrm{Ni}$ are discussed. Additionally, new values for the change in mean-square charge radii for $^{65}\mathrm{Ga}$ and $^{67}\mathrm{Ga}$ allow investigation into the odd-even staggering in the region below $N=40$.
Highlights
Over the past few decades, the investigation of the groundstate properties of isotopes residing in the vicinity of the shell closure Z = 28 has attracted significant interest
We report on the measurements of the radioactive gallium isotopes 65,67,69,75,79–82Ga
After resonant excitation and laser ionization, the ions were detected by deflecting them onto a Hamamatsu F4655-12 positive-ion microchannel plate (MCP) detector biased at −2250 V
Summary
The reversal of the π 1f5/2 and π 2p3/2 orbitals can be attributed to an attractive monopole interaction which strengthens as the neutron νg9/2 orbital gets filled [10] This eventually manifests itself with a ground-state spin change and has been observed for the copper and gallium isotope chains: in 75Cu [11] and 79Ga [12] respectively. The monopole tensor interaction has been important for explaining the triple shape coexistence exhibited in 70Ni [13], along with the presence of proton and neutron excitations across the Z = 28 shell gap
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