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

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Czechoslovak Journal of Physics Aims and scope

Abstract

Hard-photon (E γ>30 MeV) emission originating from photon-neutron bremsstrahlung collisions is investigated in four different heavy-ion reactions at intermediate bombarding energies (36Ar+197Au, 107Ag, 58Ni, 12C at 60 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 results 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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Author notes

  1. D. G. d'Enterria & G. Martínez

    Present address: SUBATECH, BP 20722, 44307, Nantes Cedex 3, France

Authors and Affiliations

  1. GANIL, BP 5027, 14076, Caen Cedex 5, France

    D. G. d'Enterria & G. Martínez

  2. Grup de Física de les Radiacions, Universitat Autònoma de Barcelona, 08193, Cerdanyola, Catalonia

    D. G. d'Enterria

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  1. D. G. d'Enterria
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  2. G. Martínez
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d'Enterria, D.G., Martínez, G. & TAPS collaboration. Thermal hard-photons probing multifragmentation in nuclear collisions around the fermi energy. Czech J Phys 50 (Suppl 4), 103–112 (2000). https://doi.org/10.1007/s10582-000-0046-5

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  • DOI: https://doi.org/10.1007/s10582-000-0046-5

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