Abstract
The strength of the magic number in neutron-rich argon isotopes is examined through high-precision mass measurements of , performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN. The new mass values are up to 90 times more precise than previous measurements. While they suggest the persistence of the shell closure for argon, we show that this conclusion has to be nuanced in light of the wealth of spectroscopic data and theoretical investigations performed with the SDPF-U phenomenological shell model interaction. Our results are also compared with ab initio calculations using the valence space in-medium similarity renormalization group and the self-consistent Green's function approaches. Both calculations provide a very good account of mass systematics at and around and, generally, a consistent description of the physics in this region. This combined analysis indicates that is the transition between the closed-shell and collective .
7 More- Received 12 February 2020
- Accepted 2 June 2020
DOI:https://doi.org/10.1103/PhysRevC.102.014301
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society