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Thermal hard-photons probing multifragmentation in nuclear collisions around the Fermi energy | | D.G. d’Enterria
; G. Mart’{i}nez
; | | Date: |
6 Jul 2000 | | Journal: | Czech.J.Phys. 50S4 (2000) 103-112 | | Subject: | nucl-ex | | Abstract: | 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. | | Source: | arXiv, nucl-ex/0007005 | | Services: | Forum | Review | PDF | Favorites | |
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