Elsevier

Nuclear Physics A

Volume 386, Issue 3, 4 October 1982, Pages 460-476
Nuclear Physics A

Δ-isobar contributions to the charge asymmetry of the three-nucleon bound states

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Abstract

Mechanisms of isospin violation in the nuclear force due to the Δ-isobar are studied. They arise from the coupling of the Δ to the photon and from the charge splitting of the Δ-mass. The charge-asymmetry contribution of the Δ to the 3He-3H binding-energy difference is calculated. Cancellations between different mechanisms are found yielding a small total result. The effect of the photon-induced Δ-excitation, traditionally considered, is negligible. The uncertainty in the Δ-mass splitting shows up in a sizeable theoretical uncertainty for the total result.

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    Work supported by funds of the Deutsche Forschungsgemeinschaft (DFG) contract Sa 247/3 and of the Österreichische Fonds zur Förderung der wissenschaftlichen Forschung contract 3987.

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