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Christian Flohr Nielsen

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

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

  • A. Mangiarotti, Universidade de Sao Paulo
  • ,
  • W. Lauth, Johannes Gutenberg University Mainz
  • ,
  • D. H. Jakubassa-Amundsen, Ludwig Maximilian University of Munich
  • ,
  • P. Klag, Johannes Gutenberg University Mainz
  • ,
  • A. A. Malafronte, Universidade de Sao Paulo
  • ,
  • M. N. Martins, Universidade de Sao Paulo
  • ,
  • C. F. Nielsen
  • U. I. Uggerhøj

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.

OriginalsprogEngelsk
Artikelnummer136113
TidsskriftPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Vol/bind815
Antal sider7
ISSN0370-2693
DOI
StatusUdgivet - apr. 2021

Bibliografisk note

Funding Information:
The technical staffs of MAMI and LAMFI-IFUSP are acknowledged for the smooth operation of the respective accelerators. The authors are grateful to Drs. W. G. P. Engel and A. C. Tromba for preparing the targets by evaporation at Laborat?rio de Alvos Nucleares-IFUSP, to Prof. Dr. T. F. Silva for the analysis of their thicknesses by Rutherford back scattering with the data collected at LAMFI-IFUSP, to Dr. A. R. Petri for help with the analysis of the ?-particle spectra, to Dr. J. Ahrens for fruitful discussions about the setup at MAMI, to Profs. Drs. A. A. F. S. Kerr and H. M. J. Barbosa for granting access to their respective installations with micro-analytical balances, and to Mr. L. A. de Queiroz e Silva for assistance with the conversion of the tables by Seltzer and Berger to digital form. They are in debt with Profs. Drs. G. Burdman, E. M. Santos, P. Sona, and A. Olmi for reading earlier versions of the present manuscript and making valuable suggestions. AM remembers his father, who passed away shortly after the measurements. This work has been supported by Funda??o de Amparo ? Pesquisa do Estado de S?o Paulo (FAPESP) under Contracts No. 2013/15634-5 and No. 2016/13116-5, by Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) under Contract No. 306331/2016-0, and by the European Union's Horizon 2020 research and innovation programme under grant agreement STRONG 2020 - No. 824093. By making the experimental bremsstrahlung spectra available to other researchers in the same form presented in this paper, we are fulfilling the Data Management Plan in accordance to the guidelines defined by FAPESP.

Funding Information:
The technical staffs of MAMI and LAMFI-IFUSP are acknowledged for the smooth operation of the respective accelerators. The authors are grateful to Drs. W. G. P. Engel and A. C. Tromba for preparing the targets by evaporation at Laboratório de Alvos Nucleares-IFUSP, to Prof. Dr. T. F. Silva for the analysis of their thicknesses by Rutherford back scattering with the data collected at LAMFI-IFUSP, to Dr. A. R. Petri for help with the analysis of the α-particle spectra, to Dr. J. Ahrens for fruitful discussions about the setup at MAMI, to Profs. Drs. A. A. F. S. Kerr and H. M. J. Barbosa for granting access to their respective installations with micro-analytical balances, and to Mr. L. A. de Queiroz e Silva for assistance with the conversion of the tables by Seltzer and Berger to digital form. They are in debt with Profs. Drs. G. Burdman, E. M. Santos, P. Sona, and A. Olmi for reading earlier versions of the present manuscript and making valuable suggestions. AM remembers his father, who passed away shortly after the measurements. This work has been supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) under Contracts No. 2013/15634-5 and No. 2016/13116-5 , by Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ) under Contract No. 306331/2016-0 , and by the European Union's Horizon 2020 research and innovation programme under grant agreement STRONG 2020 - No. 824093 . By making the experimental bremsstrahlung spectra available to other researchers in the same form presented in this paper, we are fulfilling the Data Management Plan in accordance to the guidelines defined by FAPESP.

Publisher Copyright:
© 2021 The Author(s)

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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