https://doi.org/10.1140/epja/i2012-12024-7
Regular Article - Theoretical Physics
Leading E1 and M1 contributions to radiative neutron capture on lithium-7
1
Department of Physics & Astronomy and HPC2 Center for Computational Sciences, Mississippi State University, 39762, Mississippi State, MS, USA
2
Kernfysisch Versneller Instituut, Theory Group, University of Groningen, 9747AA, Groningen, The Netherlands
3
Instituto de Física, Universidade de São Paulo, C.P. 66318, 05314-970, São Paulo, SP, Brazil
* e-mail: nkf22@msstate.edu
Received:
18
October
2011
Revised:
23
December
2011
Accepted:
25
January
2012
Published online:
29
February
2012
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. We also present power counting arguments that establish a hierarchy for electromagnetic one- and two-body currents. One finds that a satisfactory description of the capture reaction, in the present single-particle approximation, requires a resonance width about three times larger than the experimentally quoted value.
© SIF, Springer-Verlag Berlin Heidelberg, 2012
