Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

Abstract

One-neutron knockout reactions have been performed on a beam of radioactive Co53 in a high-spin isomeric state. The analysis is shown to yield a highly selective population of high-spin states in an exotic nucleus with a significant cross section, and hence represents a technique that is applicable to the planned new generation of fragmentation-based radioactive beam facilities. Additionally, the relative cross sections among the excited states can be predicted to a high level of accuracy when reliable shell-model input is available. The work has resulted in a new level scheme, up to the 11+ band-termination state, of the proton-rich nucleus Co52 (Z=27, N=25). This has in turn enabled a study of mirror energy differences in the A=52 odd-odd mirror nuclei, interpreted in terms of isospin-nonconserving (INC) forces in nuclei. The analysis demonstrates the importance of using a full set of J-dependent INC terms to explain the experimental observations.

Metadata

Authors/Creators:

Milne, S. A. (sam519@york.ac.uk)
Bentley, M. A. https://orcid.org/0000-0001-8401-3455
Simpson, E. C. (es1034@york.ac.uk)
Baugher, T.
Bazin, D.
Berryman, J. S.
Bruce, A. M.
Davies, P. J. https://orcid.org/0000-0002-9003-0603
Diget, C. Aa https://orcid.org/0000-0002-9778-8759
Gade, A.
Henry, T. W.
Iwasaki, H.
Lemasson, A.
Lenzi, S. M.
McDaniel, S.
Napoli, D. R.
Nichols, A. J.
Ratkiewicz, A.
Scruton, L. (ls527@york.ac.uk)
Stroberg, S. R.
Tostevin, J. A.
Weisshaar, D.
Wimmer, K.
Winkler, R.

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Dates: