Article

Bremsstrahlung photons as a probe of hot nuclei

Instituto de Física Corpuscular (CSIC - Universidad de Valencia), 46100 Burjassot, Spain; Grand Accélérateur National d'Ions Lourds, BP 5027, 14021 Caen, France; Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany; II Physikalisches Institut Universität Gießen, D-35392 Gießen, Germany; Kernfysisch Versneller Instituut, 9747 AA Groningen, The Netherlands; Centre d'Etudes Nucléaires de Bordeaux-Gradignan, 33175 Gradignan, France; Soltan Institute for Nuclear Studies, 05-400 Swierk, Poland; Nuclear Physics Institute, 250 68 Řež, Czech Republic
Physics Letters B DOI:10.1016/0370-2693(95)00236-E pp.23-29

ABSTRACT Aside from the dominant production of hard photons in first-chance p-n collisions, a significant hard-photon production in a later stage of heavy-ion reactions is predicted by the BUU theory. These thermal hard photons are emitted from a nearly thermalized source and still originate from bremsstrahlung produced in individual p-n collisions. The calculations predict that the production of the thermal hard photons is strongly correlated with the incompressibility of nuclear matter. Tentative experimental evidence for their production is found in the hard-photon energy spectra measured in the systems at 60.0A MeV, 181Ta+197Au at 39.5 MeV and 208Pb+197Au at 29.5A MeV.

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26 Nov 2012

Keywords

BUU theory
 
dominant production
 
heavy-ion reactions
 
nuclear matter
 
photons
 
significant hard-photon production
 
systems
 
Tentative experimental evidence
 
thermalized source