The strength of theN=28 magic number in neutron-rich argon isotopes is examined through high-precisionmass measurements of46–48Ar, performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN. The newmass values are up to 90 times more precise than previous measurements. While they suggest the persistenceof theN=28 shell closure for argon, we show that this conclusion has to be nuanced in light of the wealth ofspectroscopic data and theoretical investigations performed with the SDPF-U phenomenological shell modelinteraction. Our results are also compared withab initiocalculations using the valence space in-mediumsimilarity renormalization group and the self-consistent Green’s function approaches. Both calculations providea very good account of mass systematics at and aroundZ=18 and, generally, a consistent description of thephysics in this region. This combined analysis indicates that46Ar is the transition between the closed-shell48Caand collective44S.
Examining the N=28 shell closure through high-precision mass measurements of Ar46–48 / M. Mougeot, D. Atanasov, C. Barbieri, K. Blaum, M. Breitenfeld, A. de Roubin, T. Duguet, S. George, F. Herfurth, A. Herlert, J.D. Holt, J. Karthein, D. Lunney, V. Manea, P. Navrátil, D. Neidherr, M. Rosenbusch, L. Schweikhard, A. Schwenk, V. Somà, A. Welker, F. Wienholtz, R.N. Wolf, K. Zuber. - In: PHYSICAL REVIEW C. - ISSN 2469-9985. - 102:1(2020 Jul 01), pp. 014301.014301-1-014301.014301-15.
|Titolo:||Examining the N=28 shell closure through high-precision mass measurements of Ar46–48|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||1-lug-2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevC.102.014301|
|Appare nelle tipologie:||01 - Articolo su periodico|