Resonance Contribution to Radiative Neutron Capture on Lithium-7

Using halo effective field theory, we provide a model-independent calculation of the radiative neutron capture on lithium-7 over an energy range where the contribution from the 3+ resonance becomes important. One finds that a satisfactory description of the capture reaction, in the present single-particle approximation, suggests the use of a resonance width about three times larger than the experimental value. We also present power counting arguments that establish a hierarchy for electromagnetic one- and two-body currents.

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