Thermal neutron captures on $d$ and ${}^3$He

Abstract

We report on a study of the $nd$ and $n{}^3$He radiative captures at thermal neutron energies, using wave functions obtained from either chiral or conventional two- and three-nucleon realistic potentials with the hyperspherical harmonics method, and electromagnetic currents derived in chiral effective field theory up to one loop. The predicted $nd$ and $n{}^3$He cross sections are in good agreement with data, but exhibit a significant dependence on the input Hamiltonian. A comparison is also made between these and new results for the $nd$ and $n{}^3$He cross sections obtained in the conventional framework for both potentials and currents.

4 pages, 4 eps figures; references added; corrections to text and abstract as suggested by referee added