1. Examining the $N$ = 28 shell closure through high-precision mass measurements of $^{46-48}$Ar
- Author
-
Mougeot, Maxime, Atanasov, Dinko, Barbieri, Carlo, Blaum, Klaus, Breitenfeld, Martin, de Roubin, Antoine, Duguet, Thomas, George, Sebastian, Herfurth, Frank, Herlert, Alexander, Holt, Jason D., Karthein, Jonas, Lunney, David, Manea, Vladimir, Navràtil, Petr, Neidherr, Dennis, Rosenbusch, Marco, Schweikhard, Lutz, Schwenk, Achim, Somà, Vittorio, Welker, Andree, Wienholtz, Frank, Wolf, Robert N., and Zuber, Kai
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
The strength of the $N$ = 28 magic number in neutron-rich argon isotopes is examined through high-precision mass measurements of $^{46-48}$Ar, 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 $N$ = 28 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 \emph{SDPF-U} phenomenological shell model interaction. Our results are also compared with \emph{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 $Z$ = 18 and, generally, a consistent description of the physics in this region. This combined analysis indicates that $^{46}$Ar is the transition between the closed-shell $^{48}$Ca and collective $^{44}$S., Comment: 17 pages, 14 figures
- Published
- 2020
- Full Text
- View/download PDF