Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-07-06
Czech.J.Phys.50S4:103-112,2000
Physics
Nuclear Physics
Nuclear Experiment
For the TAPS collaboration, 11 pages, 5 figures, 2 tables, Proceedings V TAPS Workshop, Rez near Prague, September 1999 (to be
Scientific paper
Hard-photon (E$_{\gamma} >$ 30 MeV) emission issuing from proton-neutron bremsstrahlung collisions is investigated in four different heavy-ion reactions at intermediate bombarding energies ($^{36}$Ar+$^{197}$Au, $^{107}$Ag, $^{58}$Ni, $^{12}$C at 60{\it A} MeV) coupling the TAPS photon spectrometer with two charged-particle multidetectors covering more than 80% of the solid angle. The hard-photon spectra of the three heavier targets result from the combination of two distinct exponential distributions with different slope parameters, a result which deviates from the behaviour expected for hard-photon production just in first-chance proton-neutron collisions. The thermal origin of the steeper bremsstrahlung component is confirmed by the characteristics of its slope and angular distribution. Such thermal hard-photons convey undisturbed information of the thermodynamical state of hot and excited nuclear systems undergoing multifragmentation.
d'Enterria David G.
Martinez Genaro
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