BremsLib v2.0.7
Description
BremsLib v2.0 is a library of double- and single differential cross sections (DDCS and SDCS) of electron-atom bremsstrahlung. It is a major update of BremsLib v1.0.5, which was published in 2019. BremsLib v2.0 contains the data for 86300 combinations of three physical parameters: atomic number Z, incident electron energy T1, and bremsstrahlung photon energy k. All values of Z from 1 to 100 are represented. The range of values of T1 is from 10 eV to 30 MeV for non-zero k, or from 10 eV to 100 MeV for k = 0. The range of values of k is from 0 to 0.9999*T1. The library data were calculated by the relativistic partial-wave method, except at Z = 1 or Z = 2, T1 - k >= 0.5 MeV, and k > 0 (simultaneously), when the screened Born approximation was used. The target atom is described by Kohn-Sham interaction potential. Radial dependence of proton density inside the nucleus is modeled by the Fermi distribution. The cross sections calculated using the point-nucleus approximation are also included. In comparison with BremsLib v1.0.5, the high-energy endpoint of the incident electron energy range has been increased from 3 MeV to 30 MeV, an additional grid value of k (equal to 0.975*T1) has been inserted at all values of T1, and all the previously-published data have been recalculated, with the point-nucleus approximation replaced by the Fermi distribution of proton density at sufficiently high energies of the incident electron. Although the changes in the values of the previously-published cross sections are insignificant (except at high Z and energies greater than 1 MeV, when the realistic radial distribution of nuclear charge density makes a difference), their uncertainties have been made more reliable. In the soft-photon limit, those uncertainties have been in some cases reduced by several orders of magnitude because of a more efficient calculation method based on the Low theorem, which has been applied in the case of zero k at all values of T1 up to 100 MeV. The distribution package of BremsLib v2.0 is in the .ZIP file "BremsLib_v2.0.zip" containing three folders: (a) main data folder "BremsLib_v2.0" with the values of DDCS and SDCS corresponding to 86300 combinations of the physical parameters Z, T1 and k, (b) folder "Interpolate_DCS" with the code and documentation of the program Interpolate_DCS (v1.0.7) for data retrieval and interpolation, (c) folder "Brems" with the code and documentation of the program BREMS (v1.5.8.9), which was used for generation of the library data at non-zero k. The mentioned data and codes are used as supplementary material to the following article: A. Poškus, At. Data Nucl. Data Tables, 101734, 2025, https://doi.org/10.1016/j.adt.2025.101734 In comparison with BremsLib v2.0.6, the Windows executable of Interpolate_DCS has been recompiled using static libraries (instead of DLL libraries of the Intel Fortran Compiler). This ensures its correct functioning on systems where the Intel Fortran Compiler is not installed.