Thermal Bremsstrahlung photons probing the nuclear caloric curve

Details Thermal Bremsstrahlung photons probing the nuclear caloric curve Thermal Bremsstrahlung photons probing the nuclear caloric curve

2001-11-15

arxiv.org/abs/nucl-ex/0111008v2

Phys.Lett.B538:27-32,2002

Physics

Nuclear Physics

Nuclear Experiment

13 pages, 3 figures. To appear in Physics Letters B

Scientific paper

10.1016/S0370-2693(02)01973-1

Hard-photon (E$_{\gamma}>$ 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 $T\approx$ 4 - 7 MeV. The corresponding caloric curve in the region of excitation energies $\epsilon^\star\approx$ 3{\it A} - 8{\it A} MeV shows lower values of $T$ than those expected for a Fermi fluid.

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