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Evidence for Thermal Equilibration in Multifragmentation Reactions probed with Bremsstrahlung Photons

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arxiv nucl-ex/0012009 v2 pith:7JHOKULV submitted 2000-12-23 nucl-ex

classification nucl-ex
keywords reactionsbremsstrahlungphotonssystemthermalangularbeenbreakup
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abstract

The production of nuclear bremsstrahlung photons (E$_{\gamma}>$ 30 MeV) has been studied in inclusive and exclusive measurements in four heavy-ion reactions at 60{\it A} MeV. The measured photon spectra, angular distributions and multiplicities indicate that a significant part of the hard-photons are emitted in secondary nucleon-nucleon collisions from a thermally equilibrated system. The observation of the thermal component in multi-fragment $^{36}$Ar+$^{197}$Au reactions suggests that the breakup of the thermalized source produced in this system occurs on a rather long time-scale.

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