학술논문
Summit of the N=40 Island of Inversion: precision mass measurements and ab initio calculations of neutron-rich chromium isotopes
Document Type
Working Paper
Author
Silwal, R.; Andreoiu, C.; Ashrafkhani, B.; Bergmann, J.; Brunner, T.; Cardona, J.; Dietrich, K.; Dunling, E.; Gwinner, G.; Hockenbery, Z.; Holt, J. D.; Izzo, C.; Jacobs, A.; Javaji, A.; Kootte, B.; Lan, Y.; Lunney, D.; Lykiardopoulou, E. M.; Miyagi, T.; Mougeot, M.; Mukul, I.; Murbock, T.; Porter, W. S.; Reiter, M.; Ringuette, J.; Dilling, J.; Kwiatkowski, A. A.
Source
Phys. Lett. B 833, 137288 (2022)
Subject
Language
Abstract
Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the $Z = 20$ and $28$ proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of $^{59, 61-63}$Cr confirm previous results, and the improved precision in measurements of $^{64-65}$Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.
Comment: 12 pages, 7 figures
Comment: 12 pages, 7 figures