Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions

Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions

Photon energy spectra up to the kinematic limit have been measured in 190 MeV proton reactions with light and heavy nuclei to investigate the influence of the multiple-scattering process on the photon production. Relative to the predictions of models based on a quasifree production mechanism, a stro...

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Veröffentlicht in:Physical review letters 2002-03, Vol.88 (12), p.122302-122302, Article 122302
Hauptverfasser: van Goethem, M J, Aphecetche, L, Bacelar, J C S, Delagrange, H, Díaz, J, d'Enterria, D, Hoefman, M, Holzmann, R, Huisman, H, Kalantar-Nayestanaki, N, Kugler, A, Löhner, H, Martínez, G, Messchendorp, J G, Ostendorf, R W, Schadmand, S, Siemssen, R H, Simon, R S, Schutz, Y, Turrisi, R, Volkerts, M, Wagner, V, Wilschut, H W
Format: Artikel
Sprache:eng
Schlagworte:
Nuclear Experiment
Physics
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Zusammenfassung:Photon energy spectra up to the kinematic limit have been measured in 190 MeV proton reactions with light and heavy nuclei to investigate the influence of the multiple-scattering process on the photon production. Relative to the predictions of models based on a quasifree production mechanism, a strong suppression of bremsstrahlung is observed in the low-energy region of the photon spectrum. We attribute this effect to the interference of photon amplitudes due to multiple scattering of nucleons in the nuclear medium.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.88.122302