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Mirror Energy Differences at Large Isospin Studied through Direct Two-Nucleon Knockout

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arxiv 1308.1254 v1 pith:DVU5O7GW submitted 2013-08-06 nucl-ex

Mirror Energy Differences at Large Isospin Studied through Direct Two-Nucleon Knockout

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keywords isospinmirrordifferencesenergyknockoutlargenonconservingstates
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The first spectroscopy of excited states in 52Ni (Tz=2) and 51Co (Tz=-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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