Evidence for Thermal Equilibration in Multifragmentation Reactions probed with Bremsstrahlung Photons
D. G. d'Enterria, L. Aphecetche, A. Chbihi, H. Delagrange, J. Díaz, M. J. van Goethem, M. Hoefman, A. Kugler, H. Löhner, G. Martínez, M. J. Mora, R. Ortega, R. Ostendorf, S. Schadmand, Y. Schutz, R. H. Siemssen, D. Stracener, P. Tlusty, R. Turrisi, M. Volkerts, V. Wagner, H. Wilschut, N. Yahlali
Abstract
The production of nuclear bremsstrahlung photons (Eγ> 30 MeV) has been studied in inclusive and exclusive measurements in four heavy-ion reactions at 60 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 36Ar+197Au reactions suggests that the breakup of the thermalized source produced in this system occurs on a rather long time-scale.
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