Spherical harmonics moments of neutron angular flux for spherically symmetric systems

Spherical harmonics moments of the neutron angular ¯ux are calculated for spherically symmetric systems. Neutron angular ¯uxes are determined by employing the SN method. Spherical harmonics moments of SN method calculations are compared to the singular eigen function expansion computations. Total ¯ux and current determined by both of these meth- ods show a good agreement, so the higher order moments are also compared. This study was undertaken to investigate accuracy in calculation of the spherical harmonics moments by the purely numerical SN method.