title: Suppression of soft nuclear bremsstrahlung in proton-nucleus collisions.
abstract: 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.
authors.affiliation: Kernfysisch Versneller Instituut, Zernikelaan 25, NL-9747 AA Groningen, The Netherlands.
authors.forename: M J
authors.initials: MJ
authors.lastname: van Goethem
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authors.initials: L
authors.lastname: Aphecetche
authors.forename: J C S
authors.initials: JC
authors.lastname: Bacelar
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authors.lastname: Delagrange
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authors.lastname: Díaz
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authors.lastname: d'Enterria
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authors.lastname: Hoefman
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authors.lastname: Holzmann
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authors.lastname: Huisman
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authors.lastname: Kalantar-Nayestanaki
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authors.lastname: Kugler
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authors.lastname: Löhner
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authors.lastname: Martínez
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authors.lastname: Messchendorp
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authors.lastname: Ostendorf
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authors.lastname: Schadmand
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authors.lastname: Siemssen
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authors.initials: RS
authors.lastname: Simon
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authors.initials: Y
authors.lastname: Schutz
authors.forename: R
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authors.lastname: Turrisi
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authors.initials: M
authors.lastname: Volkerts
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authors.initials: V
authors.lastname: Wagner
authors.forename: H W
authors.initials: HW
authors.lastname: Wilschut