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Hard-photon (E$_{\gamma} >$ 30 MeV) emission issuing from proton-neutronbremsstrahlung collisions is investigated in four different heavy-ion reactionsat intermediate bombarding energies ($^{36}$Ar+$^{197}$Au, $^{107}$Ag,$^{58}$Ni, $^{12}$C at 60{\it A} MeV) coupling the TAPS photon spectrometerwith two charged-particle multidetectors covering more than 80% of the solidangle. The hard-photon spectra of the three heavier targets result from thecombination of two distinct exponential distributions with different slopeparameters, a result which deviates from the behaviour expected for hard-photonproduction just in first-chance proton-neutron collisions. The thermal originof the steeper bremsstrahlung component is confirmed by the characteristics ofits slope and angular distribution. Such thermal hard-photons conveyundisturbed information of the thermodynamical state of hot and excited nuclearsystems undergoing multifragmentation.Comment: For the TAPS collaboration, 11 pages, 5 figures, 2 tables,  Proceedings V TAPS Workshop, Rez near Prague, September 1999 (to be published  in Czech. Jour. Phys.

Thermal hard-photons probing multifragmentation in nuclear collisions around the fermi energy