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Neutron Skin Effects in Mirror Energy Differences: The Case of Mg-23-Na-23
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 3, article id 032502Article in journal (Refereed) Published
Abstract [en]

Energy differences between analogue states in the T = 1/2 Mg-23-Na-23 mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetrybreaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f(7/2) shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f(7/2) shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s(1/2) "halo" orbit.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 121, no 3, article id 032502
National Category
Subatomic Physics
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URN: urn:nbn:se:kth:diva-232896DOI: 10.1103/PhysRevLett.121.032502ISI: 000439286800004PubMedID: 30085775Scopus ID: 2-s2.0-85050384281OAI: oai:DiVA.org:kth-232896DiVA, id: diva2:1237387
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QC 20180808

Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2020-03-09Bibliographically approved

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Cederwall, Bo

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