Speaker
Description
The study of nuclear electromagnetic moments plays a crucial role in understanding the structure of atomic nuclei [1]. While the electric quadrupole moments in atomic nuclei indicate nuclear deformation and collectivity, the magnetic dipole moments are sensitive to the single-particle properties of valence nucleons. In our nuclear DFT methodology, the intrinsic electric quadrupole and magnetic dipole moments in odd nuclei are generated by the self-consistent shape and spin core polarization effects induced by the unpaired nucleon. The spectroscopic moments of angular-momentum-projected wave functions are determined and compared with the available experimental data without introducing effective charges and $g$-factors. We have applied our methodology to calculate the spectroscopic moments in heavy deformed open-shell odd nuclei in several regions of the nuclear chart [2, 3, 4].
In contrast to the predicted quadrupole moments that generally reproduce the data very well, the calculated magnetic dipole moments may deviate from the data sometimes by a significant amount. To improve the agreement with the data, following Refs. [5, 6], we extended the one-body magnetic dipole moment operator used in the nuclear DFT by two-body terms derived from the meson-exchange currents. We have incorporated these terms into our recent calculations for the odd-nuclei around eight doubly magic nuclei ($^{16}$O, $^{40}$Ca, $^{48}$Ca, $^{56}$Ni, $^{78}$Ni, $^{100}$Sn, $^{132}$Sn, and $^{208}$Pb). In this talk, the impact of the inclusion of the meson-exchange currents on the spectroscopic magnetic dipole moments will be discussed.
Keywords: nuclear DFT, magnetic moments, meson-exchange currents
[1] G. Neyens, Rep. Prog. Phys. 66, 633 (2003)
[2] P. L. Sassarini et al., J. Phys. G: Nucl. Part. Phys. 49, 11LT01 (2022)
[3] J. Bonnard et al., Phys. Lett. B 843 138014 (2023)
[4] H. Wibowo et al., to be published
[5] R. Seutin et al., Phys. Rev. C 108, 054005 (2023)
[6] T. Miyagi et al., Phys. Rev. Lett. 132, 232503 (2024)
