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Phys Rev Lett. 2013 Aug 16;111(7):072501. Epub 2013 Aug 16.

Mirror energy differences at large isospin studied through direct two-nucleon knockout.

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Department of Physics, University of York, Heslington, York, United Kingdom.


The first spectroscopy of excited states in 52Ni (T(z)=-2) and 51Co (T(z)=-3/2) has been obtained using the highly selective two-neutron knockout reaction. Mirror energy differences between isobaric analogue states in these nuclei and their mirror partners are interpreted in terms of isospin nonconserving effects. A comparison between large-scale shell-model calculations and data provides the most compelling evidence to date that both electromagnetic and an additional isospin nonconserving interactions for J=2 couplings, of unknown origin, are required to obtain good agreement.

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