BREMS: Partial-wave calculation of spectra and angular distributions of electron-atom bremsstrahlung at electron energies less than 30 MeV (New Version Announcement)

A new version of the Fortran program BREMS, which calculates single- and double-differential cross sections (DDCS) of electron-atom bremsstrahlung by the relativistic partial-wave method, is presented. The detailed description of the program is given in the original paper [Comput. Phys. Commun. 232 (2018) 237–255]. The new numerical methods implemented in the latest version include cubic spline interpolation of the radial matrix elements with respect to the orbital quantum number of the emitted photon, and usage of scaling properties of the partial-wave DDCS as a function of two variables – the photon emission angle and the number of partial waves retained in the truncated partial-wave series. As a result of improvements of efficiency and accuracy of the code, the endpoint of the energy range where the partial-wave calculations of bremsstrahlung cross sections are feasible has been increased by an order of magnitude (from 3 MeV to 30 MeV). In addition, three “special” modes of operation, which do not involve partial-wave calculations, but can be used to provide some auxiliary quantities, have been implemented.