BremsLib v2.0.3

BremsLib v2.0 is a library of double- and single differential cross sections 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 variation 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 variation of k / T1 is from 0 to 0.9999. The library data were calculated by the relativistic partial-wave method. 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 the radiated photon energy (equal to 97.5% of the incident electron energy) has been inserted at all values of the incident electron energy, 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 photon energy at all values of the incident electron energy up to 100 MeV.
The distribution package of BremsLib v2.0 is in a .ZIP file, which contains three folders:
(a) main library data folder "BremsLib_v2.0" with the values of scaled double- and single-differential cross sections of bremsstrahlung corresponding to 86300 combinations of the physical parameters Z, T1 and k / T1,
(b) folder "Interpolate_DCS" with the code and documentation of the program Interpolate_DCS (v1.0.3), which can be used 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 only difference from the previous version of BremsLib v2.0 (DOI: 10.17632/6zfsc9xsz8.3) is a correction of a bug in the code of Interpolate_DCS, which caused abnormal termination of the program with a message about an interpolation error when some of the user-specified angles of photon emission were greater than 179.5 degrees but less than 180 degrees.