Snutp 94-124 Radiative Neutron-proton Capture in Effective Chiral Lagrangians
نویسنده
چکیده
We calculate the cross-section for the thermal n + p! d+ 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 0:3) % in amplitude and the chiral perturbation at one-loop order gives the cross section np th = (334 2) mb which is in agreement with the experimental value (334:2 0:5) mb. Together with the axial charge transitions, this provides a strong support for the power of chiral Lagrangians for nuclear physics. PACS: 12.39.Fe 21.30.+y 21.10.Ky 25.40.Lw Typeset using REVTEX
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تاریخ انتشار 1999