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

D. G. d'Enterria·G. Martínez
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Abstract

Hard-photon (E$_γ >$ 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.

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D. G. d'Enterria, G. Martínez. 2000-07-06. Thermal hard-photons probing multifragmentation in nuclear collisions around the Fermi energy. https://doi.org/10.1007/s10582-000-0046-5

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