Radiative Neutron-Proton Capture in Effective Chiral Lagrangians

Details Radiative Neutron-Proton Capture in Effective Chiral Lagrangians Radiative Neutron-Proton Capture in Effective Chiral Lagrangians

1994-12-16

arxiv.org/abs/nucl-th/9412025v1

Phys.Rev.Lett. 74 (1995) 4153-4156

Physics

Nuclear Physics

Nuclear Theory

9 pages, revtex, uses epsfig.sty, 2 uuencoded figures

Scientific paper

10.1103/PhysRevLett.74.4153

We calculate the cross-section for the thermal $n+p\rightarrow d+\gamma$ process in chiral perturbation theory to next-to-next-to-leading order using heavy-fermion formalism. The exchange current correction is found to be $(4.5\pm 0.3)~\%$ in amplitude and the chiral perturbation at one-loop order gives the cross section $\sigma_{th}^{np}=(334\pm 2)\ {\mbox mb}$ which is in agreement with the experimental value $(334.2\pm 0.5)\ {\mbox mb}$. Together with the axial charge transitions, this provides a strong support for the power of chiral Lagrangians for nuclear physics.

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