학술논문
Electromagnetic moments of the odd-mass nickel isotopes $^{59-67}$Ni
Document Type
Working Paper
Author
Müller, P.; Kaufmann, S.; Miyagi, T.; Billowes, J.; Bissell, M. L.; Blaum, K.; Cheal, B.; Ruiz, R. F. Garcia; Gins, W.; Gorges, C.; Heylen, H.; Kanellakopoulos, A.; Malbrunot-Ettenauer, S.; Neugart, R.; Neyens, G.; Nörtershäuser, W.; Ratajczyk, T.; Rodríguez, L. V.; Sánchez, R.; Sailer, S.; Schwenk, A.; Wehner, L.; Wraith, C.; Xie, L.; Xu, Z. Y.; Yang, X. F.; Yordanov, D. T.
Source
Physics Letters B 854 (2024) 138737
Subject
Language
Abstract
The magnetic dipole and the spectroscopic quadrupole moments of the nuclear ground states in the odd-mass nickel isotopes $^{59-67}$Ni have been determined using collinear laser spectroscopy at the CERN-ISOLDE facility. They are compared to ab initio valence-space in-medium similarity renormalization group (VS-IMSRG) calculations including contributions of two-body currents as well as to shell-model calculations. The two-body-current contributions significantly improve the agreement with experimental data, reducing the mean-square deviation from the experimental moments by a factor of 3 to 5, depending on the employed interaction. For all interactions, the largest contributions are obtained for the $5/2^-$ ($7/2^-$) isotopes $^{65}$Ni ($^{55}$Ni), which is ascribed to the high angular momentum of the $f$ orbitals. Our results demonstrate that the inclusion of two-body-current contributions to the magnetic moment in an isotopic chain of complex nuclei can be handled by the VS-IMSRG and can outperform phenomenological shell-model calculations using effective $g$-factors in the nickel region.
Comment: Published in Physics Letters B, 10 pages, 3 figures
Comment: Published in Physics Letters B, 10 pages, 3 figures