On higher–order corrections to nuclear bremsstrahlung cross sections

Publication date: Available online 25 April 2019Source: Radiation Physics and ChemistryAuthor(s): A. Mangiarotti, D.H. Jakubassa-Amundsen, M.N. MartinsAbstractA quantitative understanding of bremsstrahlung by electrons in the screened field of atomic nuclei has been developed by several researchers over the last 80 years. However, some ranges of the possible parameters still can not be covered with good accuracy. Dirac partial-wave calculations are the best method developed to date, while analytic calculations are the only viable solution at high impinging electron energies. Recent progresses on both fronts will be discussed. In particular, state of the art partial wave results, including screening, allowed to test the Olsen–Maximon–Wergeland additivity rule discovered by analytic means. Closed expressions for the next-to-leading order corrections to the Furry–Sommerfeld–Maue wave functions are known. One next-to-next-to-leading order term is typically included in this type of approach. The effect of this extra term on the angular dependence of the double differential cross sections for photon emission by 2.5 MeV electrons is compared in detail with partial wave calculations which are exact at all orders.

Source: Radiation Physics and Chemistry - April 26, 2019 Category: Physics Source Type: research