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 53Co 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 11þ band-termination state, of the protonrich nucleus 52Co (Z ¼ 27, N ¼ 25). This has in turn enabled a study of mirror energy differences in the A ¼ 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.
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Submitted on : Tuesday, August 30, 2016 - 2:26:30 PM
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S.A. Milne, M.A. Bentley, E.C. Simpson, T. Baugher, D. Bazin, et al.. Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States. Physical Review Letters, American Physical Society, 2016, 117, pp.082502. ⟨10.1103/PhysRevLett.117.082502⟩. ⟨in2p3-01357780⟩

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