Thermal Bremsstrahlung photons probing the nuclear caloric curve
Abstract
Hard-photon (Eγ> 30 MeV) emission from second-chance nucleon-nucleon Bremsstrahlung collisions in intermediate energy heavy-ion reactions is studied employing a realistic thermal model. Photon spectra and yields measured in several nucleus-nucleus reactions are consistent with an emission from hot nuclear systems with temperatures T≈ 4 - 7 MeV. The corresponding caloric curve in the region of excitation energies ε≈ 3 A - 8 A MeV shows lower values of T than those expected for a Fermi fluid.
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