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Spin, moments, and mean square nuclear charge radius of Sr 77

1992; American Institute of Physics; Volume: 46; Issue: 2 Linguagem: Inglês

10.1103/physrevc.46.797

1538-4497

Peter Lievens, L. Vermeeren, R. E. Silverans, E. Arnold, R. Neugart, K. Wendt, F. Buchinger,

Quantum Chromodynamics and Particle Interactions

The neutron deficient $^{77}\mathrm{Sr}$ nucleus was studied by fast ion beam collinear laser spectroscopy with a detection scheme based on optical pumping, state selective neutralization, and atom counting. From the measured hyperfine splitting and isotope shift of the Sr II transition 5s $^{2}$${\mathit{S}}_{1/2}$\ensuremath{\rightarrow}5p $^{2}$${\mathit{P}}_{3/2}$ the nuclear spin I=5/2, the nuclear moments \ensuremath{\mu}=-0.348(4)${\mathrm{\ensuremath{\mu}}}_{\mathit{N}}$, ${\mathit{Q}}_{\mathit{s}}$=1.40(11) b, and the change in mean square charge radius \ensuremath{\delta}〈${\mathit{r}}^{2}$${\mathrm{〉}}^{88,77}$=0.248(12) ${\mathrm{fm}}^{2}$ were deduced. These ground-state properties indicate a large prolate deformation of ${\mathrm{\ensuremath{\epsilon}}}_{2}$\ensuremath{\simeq}0.4 and allow a comparison with calculations performed in the particle-plus-deformed-core model, assigning a [422]5/2 Nilsson configuration to the ground state of $^{77}\mathrm{Sr}$.