Photoproduction of pairs of neutral fermions with a magnetic moment in the field of a nucleus of arbitrary spin

We have investigated the electromagnetic (Bethe-Heitler) process of the formation of a pair of neutral baryons of spin 1/2 by a photon in the field of a nucleus possessing electric quadrupole and magnetic dipole and octupole moments. The cross section for photoproduction of neutron-antineutron pairs has been found as a function of the electric (Ze, Q) and magnetic (_I, ) multipole moments of the target nucleus. The angular distribution and energy spectrum of the neutron of the pair produced have been studied for⁹Be,¹²C, and⁴⁰Ca nuclei.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 69–75, May, 1982.