University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Shell evolution approaching the N=20 island of inversion: Structure of ²⁹Mg

Matta, A., Catford, W. M., Orr, N. A., Henderson, J., Ruotsalainen, P., Hackman, G., Garnsworthy, A. B., Delaunay, F., Wilkinson, R., Lotay, G. , Tsunoda, Naofumi, Otsuka, Takaharu, Knapton, A. J., Ball, G. C., Bernier, N., Burbadge, C., Chester, A., Cross, D. S., Cruz, S., Diget, C. Aa., Domingo, T., Drake, T. E., Evitts, L. J., Garcia, F. H., Hallam, S., MacConnachie, E., Moukaddam, M., Muecher, D., Padilla-Rodal, E., Paetkau, O., Park, J., Pore, J. L., Rizwan, U., Smallcombe, J., Smith, J. K., Starosta, K., Svensson, C. E., Williams, J. and Williams, M. (2019) Shell evolution approaching the N=20 island of inversion: Structure of ²⁹Mg Physical Review C, 99, 044320. 044320-1.

[img]
Preview
Text
Shell evolution.pdf - Version of Record

Download (1MB) | Preview

Abstract

The island of inversion for neutron-rich nuclei in the vicinity of N=20 has become the testing ground par excellence for our understanding and modeling of shell evolution with isospin. In this context, the structure of the transitional nucleus ²⁹Mg is critical. The first quantitative measurements of the single-particle structure of ²⁹Mg are reported, using data from the d(²⁸Mg, p γ)²⁹Mg reaction. Two key states carrying significant =3 (f-wave) strength were identified at 2.40±0.10 (Jπ=5/2¯) and 4.28±0.04 MeV (7/2¯). New state-of-the-art shell-model calculations have been performed and the predictions are compared in detail with the experimental results. While the two lowest 7/2¯ levels are well described, the sharing of single-particle strength disagrees with experiment for both the 3/2¯ and 5/2¯ levels and there appear to be general problems with configurations involving the p3/2 neutron orbital and core-excited components. These conclusions are supported by an analysis of the neutron occupancies in the shell-model calculations.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Matta, A.a.matta@surrey.ac.uk
Catford, W. M.W.Catford@surrey.ac.uk
Orr, N. A.
Henderson, J.
Ruotsalainen, P.
Hackman, G.
Garnsworthy, A. B.
Delaunay, F.
Wilkinson, R.r.wilkinson@surrey.ac.uk
Lotay, G.g.lotay@surrey.ac.uk
Tsunoda, Naofumi
Otsuka, Takaharu
Knapton, A. J.a.knapton@surrey.ac.uk
Ball, G. C.
Bernier, N.
Burbadge, C.
Chester, A.
Cross, D. S.
Cruz, S.
Diget, C. Aa.
Domingo, T.
Drake, T. E.
Evitts, L. J.l.evitts@surrey.ac.uk
Garcia, F. H.
Hallam, S.s.hallam@surrey.ac.uk
MacConnachie, E.
Moukaddam, M.m.moukaddam@surrey.ac.uk
Muecher, D.
Padilla-Rodal, E.
Paetkau, O.
Park, J.
Pore, J. L.
Rizwan, U.
Smallcombe, J.
Smith, J. K.
Starosta, K.
Svensson, C. E.
Williams, J.
Williams, M.
Date : 29 April 2019
Funders : Science and Technology Facilities Council (STFC), Engineering and Physical Sciences Research Council (EPSRC)
DOI : 10.1103/PhysRevC.99.044320
Copyright Disclaimer : © 2019 American Physical Society
Depositing User : Clive Harris
Date Deposited : 17 Sep 2019 15:25
Last Modified : 17 Sep 2019 15:25
URI: http://epubs.surrey.ac.uk/id/eprint/852654

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800