Dipole and quadrupole moments of Cu73-78 as a test of the robustness of the Z=28 shell closure near Ni-78

作者：de Groote R P^*; Billowes J; Binnersley C L; Bissell M L; Cocolios T E; Goodacre T Day; Farooq Smith G J; Fedorov D V; Flanagan K T; Franchoo S; Ruiz R F Garcia; Koszorus A; Lynch K M; Neyens G; Nowacki F; Otsuka T; Rothe S; Stroke H H; Tsunoda Y; Vernon A R; Wendt K D A; Wilkins S G; Xu Z Y; Yang X F

来源：PHYSICAL REVIEW C, 2017, 96(4): 041302.

DOI：10.1103/PhysRevC.96.041302

Nuclear spins and precise values of the magnetic dipole and electric quadrupole moments of the ground states of neutron-rich Cu73-78 isotopes were measured using the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the CERN On-Line Isotope Mass Separator (ISOLDE) facility. The nuclear moments of the less exotic Cu-73,Cu-75 isotopes were remeasured with similar precision, yielding values that are consistent with earlier measurements. The moments of the odd-odd isotopes, and Cu-78(29) (N = 49) in particular, are used to investigate excitations of the assumed doublymagic Ni-78 core through comparisons with large-scale shell-model calculations. Despite the narrowing of the Z = 28 shell gap between N similar to 45 and N = 50, themagicity of Z = 28 and N = 50 is restored toward Ni-78. This is due to weakened dynamical correlations, as clearly probed by the present moment measurements.

• 出版日期2017-10-4