Spectral distribution and Coulomb correction for nuclear bremsstrahlung induced by heavy targets

Author(s)

Mangiarotti, A. ^[1] ; Lauth, W. ^[2] ; Jakubassa-Amundsen, D. H. ^[3] ; Klag, P. ^[2] ; Malafronte, A. A. ^[1] ; Martins, M. N. ^[1] ; Nielsen, C. F. ^[4] ; Uggerhoj, I, U.

Affiliation

^[1] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo - Brazil

^[2] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz - Germany

^[3] Univ Munich, Math Inst, Theresienstr 39, D-80333 Munich - Germany

^[4] I, Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus - Denmark

• Document type: Journal article
• Source: Physics Letters B; v. 815, APR 10 2021.
• Web of Science Citations: 0

Abstract

Bremsstrahlung spectra below 250 MeV have been measured colliding 500 MeV?electrons with Cu, Ag, and Au targets. The experimental intensity ratios relative to Cu are well described by an accurate analytical high-energy theory, which accounts both for Coulomb distortion and screening. This represents the first experimental verification of the discovery by Bethe-Maximon that leading-order quantum mechanical calculations, equivalent to quasiclassical approximations, become exact at high energies and small angles. It also shows that radiative QED effects play a minor role in the covered part of the spectral distribution within the accuracy (1.6%) of the present measurements. ? 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (AU)

• FAPESP's process: 16/13116-5 - Systematic measurements of electron and proton multiple scattering with energies up to 5 MEV
• Grantee: Alessio Mangiarotti
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 13/15634-5 - Study of bremsstrahlung properties at the few MeV energy range
• Grantee: Marcos Nogueira Martins
• Support Opportunities: Research Grants - Visiting Researcher Grant - International