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

Abstract

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. In the most cases, the addition of long-range TPE currents improved the description of the experimental data.

arXiv comment11 pages, 6 figures (35 eps files)

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• Nuclear axial current operators to fourth order in chiral effective field theory
• Nuclear Currents in Chiral Effective Field Theory
• Radiative Capture of Cold Neutrons by Protons and Deuteron Photodisintegration with Twisted Beams
• Break-up channels in muon capture on 3He
• Testing semi-local chiral two-nucleon interaction in selected electroweak processes
• Deuteron electromagnetic form factors in a renormalizable formulation of chiral effective field theory
• Momentum space treatment of inclusive neutrino scattering off the deuteron and trinucleons
• Theoretical uncertainties of the elastic nucleon-deuteron scattering observables
• Electroweak Currents from Chiral Effective Field Theory
• Deuteron disintegration in three dimensions
• Local stability of self-gravitating disks in $f(R)$ gravity
• Applications of the chiral potential with the semi-local regularization in momentum space to the disintegration processes
• The longitudinal response function of the deuteron in chiral effective field theory
• Spin observables in the two-nucleon capture and dissociation processes at low energies
• Photo Reactions with Universal Trimers