학술논문
Examining the $N$ = 28 shell closure through high-precision mass measurements of $^{46-48}$Ar
Document Type
Working Paper
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.; Zuber, Kai
Source
Phys. Rev. C 102, 014301 (2020)
Subject
Language
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
Comment: 17 pages, 14 figures