Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2011-03-21
Phys.Rev.C83:064004,2011
Physics
Nuclear Physics
Nuclear Theory
11 pages, 6 figures (35 eps files)
Scientific paper
10.1103/PhysRevC.83.064004
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.
Epelbaum Evgeny
Golak Jacek
Kolling S.
Krebs Helmut
Rozpedzik D.
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