Coexisting normal and intruder configurations in $^{32}$Mg
Abstract
Situated in the so-called "island of inversion," the nucleus Mg is considered as an archetypal example of the disappearance of magicity at . We report on high statistics in-beam spectroscopy of Mg with a unique approach, in that two direct reaction probes with different sensitivities to the underlying nuclear structure are employed at the same time. More specifically, states in Mg were populated by knockout reactions starting from Mg and Si, lying inside and outside the island of inversion, respectively. The momentum distributions of the reaction residues and the cross sections leading to the individual final states were confronted with eikonal-based reaction calculations, yielding a significantly updated level scheme for Mg and spin-parity assignments. By fully exploiting observables obtained in this measurement, a variety of structures coexisting in 32Mg was unraveled. Comparisons with theoretical predictions based on shell-model overlaps allowed for clear discrimination between different structural models, revealing that the complete theoretical description of this key nucleus is yet to be achieved.
Cite
@article{arxiv.2109.12090,
title = {Coexisting normal and intruder configurations in $^{32}$Mg},
author = {N. Kitamura and K. Wimmer and A. Poves and N. Shimizu and J. A. Tostevin and V. M. Bader and C. Bancroft and D. Barofsky and T. Baugher and D. Bazin and J. S. Berryman and V. Bildstein and A. Gade and N. Imai and T. Kröll and C. Langer and J. Lloyd and E. Lunderberg and F. Nowacki and G. Perdikakis and F. Recchia and T. Redpath and S. Saenz and D. Smalley and S. R. Stroberg and Y. Utsuno and D. Weisshaar and A. Westerberg},
journal= {arXiv preprint arXiv:2109.12090},
year = {2021}
}