Neutron Skin Effects in Mirror Energy Differences: The Case of Mg23Na23

A. Boso et al.
Phys. Rev. Lett. 121, 032502 – Published 19 July 2018

Abstract

Energy differences between analogue states in the T=1/2 Mg23Na23 mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetry-breaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f7/2 shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f7/2 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 s1/2 “halo” orbit.

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  • Received 13 April 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.032502

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 121, Iss. 3 — 20 July 2018

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