Abstract
Energy differences between isobaric analogue states have been extracted for the A=79, 79Zr/79Y mirror pair following their population via nucleon-knockout reactions from intermediate-energy rare-isotope beams. These are the heaviest nuclei where such measurements have been made to date. The deduced mirror energy differences (MED) are compared with predictions from a new density-functional based approach, incorporating isospin-breaking effects of both Coulomb and nuclear charge-symmetry breaking and configuration mixing.
Highlights
The approximately charge-symmetric and charge-independent nature of the nuclear force [1] yields very strong symmetries between particular states in nuclei with the same mass number, A
The trajectories and momentum distributions of the recoiling reaction products were measured in the S800 spectrograph, and this information was combined with the measured first γ -ray interaction point in the GRETINA array to enable precise event-byevent γ -ray Doppler corrections
We present here the results of a new approach to Mirror Energy Differences (MED) studies based on density-functional theory, and using the previously developed methodology of the no-core configuration-interaction (NCCI) model [15] which allows for full treatment of both rotational and isospin symmetries
Summary
The approximately charge-symmetric and charge-independent nature of the nuclear force [1] yields very strong symmetries between particular (analogue) states in nuclei with the same mass number, A. Observed discrepancies between the excitation energies of isobaric multiplets can be attributed to the presence of isospinviolating interactions originating from Coulomb and magnetic effects, as well as isospin-nonconserving (INC) components of the nucleon-nucleon interaction. In mirror nuclei, such energy differences, termed Mirror Energy Differences (MED), are of isovector origin and are defined as: MED J
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