Isospin Symmetry of Odd-Odd Mirror Nuclei: Identification of Excited States in $N=Z\ensuremath{-}2$ $^{48}\mathrm{Mn}$

Isospin Symmetry of Odd-Odd Mirror Nuclei: Identification of Excited States in $N = Z - 2$ ${}^{48}{Mn}$

M. A. Bentley, C. Chandler, M. J. Taylor, J. R. Brown, M. P. Carpenter, C. Davids, J. Ekman, S. J. Freeman, P. E. Garrett, G. Hammond, R. V. F. Janssens, S. M. Lenzi, C. J. Lister, R. du Rietz, and D. Seweryniak

Phys. Rev. Lett. 97, 132501 – Published 25 September 2006

Abstract

Excited states have been observed in the $N = Z - 2$ odd-odd nucleus ${}^{48}{Mn}$ for the first time. Through comparison with the structure of ${}^{48}V$ , a first high-spin study of an odd-odd mirror pair has been achieved. Differences between the $T = 1$ analogue states in this pair have been interpreted in terms of Coulomb effects, with the aid of shell-model calculations in the full $p f$ valence space. Unlike other mirror pairs, the energy differences have been interpreted almost entirely as due to a monopole effect associated with smooth changes in radius (or deformation) as a function of angular momentum. In addition, the large energy shift between analogue negative-parity states is interpreted in terms of the electromagnetic spin-orbit interaction in nuclei.

Received 31 May 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.132501

Authors & Affiliations

M. A. Bentley¹, C. Chandler², M. J. Taylor¹, J. R. Brown¹, M. P. Carpenter³, C. Davids³, J. Ekman^4,*, S. J. Freeman^3,5, P. E. Garrett⁶, G. Hammond², R. V. F. Janssens³, S. M. Lenzi⁷, C. J. Lister³, R. du Rietz⁴, and D. Seweryniak³

¹Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
²School of Chemistry and Physics, Keele University, Keele, Staffordshire ST5 5BG, United Kingdom
³Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
⁴Department of Physics, Lund University, S-22100 Lund, Sweden
⁵School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
⁶Department of Physics, University of Guelph, Guelph, Ontario N1G2W1, Canada
⁷Dipartimento di Fisica dell’Università and INFN, Sezione di Padova, I-35131 Padova, Italy

^*Present address: Teknik och Samhälle, Malmö Högskola, 20506 Malmö, Sweden.

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Vol. 97, Iss. 13 — 29 September 2006

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Physical Review Letters

Isospin Symmetry of Odd-Odd Mirror Nuclei: Identification of Excited States in N=Z−2 Mn48

M. A. Bentley, C. Chandler, M. J. Taylor, J. R. Brown, M. P. Carpenter, C. Davids, J. Ekman, S. J. Freeman, P. E. Garrett, G. Hammond, R. V. F. Janssens, S. M. Lenzi, C. J. Lister, R. du Rietz, and D. Seweryniak

Phys. Rev. Lett. 97, 132501 – Published 25 September 2006

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Isospin Symmetry of Odd-Odd Mirror Nuclei: Identification of Excited States in $N = Z - 2$ ${}^{48}{Mn}$