https://doi.org/10.1140/epja/i2009-10786-5
Regular Article - Experimental Physics
Proton-proton bremsstrahlung cross-sections including the kinematical singularity
1
Department of Physics, University of Tehran, North Kargar Avenue, P.O. Box 14395/547, Tehran, Iran
2
Kernfysisch Versneller Instituut, University of Groningen, Zernikelaan 25, 9747 AA, Groningen, The Netherlands
3
Rudjer Bošković Institute, Zagreb, Croatia
* e-mail: mmshafiei@khayam.ut.ac.ir
Received:
15
December
2008
Revised:
4
April
2009
Accepted:
2
May
2009
Published online:
30
May
2009
Integrated cross-section data for proton-proton bremsstrahlung including the points with the phase-space singularity, which occurs close to the maximum non-coplanarity angle, are presented. A numerical integration of theoretical cross-sections is performed over the non-coplanarity angle to integrate out this singularity. Furthermore, a comparison is made between measured cross-sections and predictions of two soft-photon models. All features observed for the data far from the singularity, including the overestimation of the cross-section by 
30% by the theoretical calculations, emerge as well for the data close to and including the singularity.
PACS: 13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) – / 25.10.+s Nuclear reactions involving few-nucleon systems – / 25.20.Lj Photoproduction reactions –
© SIF, Springer-Verlag Berlin Heidelberg, 2009
