Signatures of the chiral two-pion exchange electromagnetic currents in the 2H and 3He photodisintegration reactions

Understand

The recently derived long-range two-pion exchange (TPE) contributions to the nuclear current operator which appear at next-to-leading order (NLO) of the chiral expansion are used to describe electromagnetic processes.

• We study their role in the photodisintegration of 2H and 3He and compare our predictions with experimental data.
• The bound and scattering states are calculated using five different parametrizations of the chiral next-to-next-to-leading order (N2LO) nucleon-nucleon (NN) potential which allows us to estimate the theoretical uncertainty at a given order in the chiral expansion.
• For some observables the results are very close to the predictions based on the AV18 NN potential and the current operator (partly) consistent with this force.