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

Davies, P.J.; Bentley, M.A.; Henry, T.W.; Simpson, Edward; Gade, A; Lenzi, S.M.; Baugher, T.; Bazin, D.; Berryman, J.S.; Bruce, A M; Diget, C. Aa

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

Date

2013

Authors

Davies, P.J.

Bentley, M.A.

Henry, T.W.

Simpson, Edward

Gade, A

Lenzi, S.M.

Baugher, T.

Bazin, D.

Berryman, J.S.

Bruce, A M

Publisher

American Physical Society

Abstract

The first spectroscopy of excited states in Ni52 (Tz=-2) and Co51 (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. � 2013 American Physical Society.