Thermal Bremsstrahlung photons probing the nuclear caloric curve

D. G. d'Enterria; G. MartÃ­nez; L. Aphecetche; H. Delagrange; F. FernÃ¡ndez; H. LÃ¶hner; R. Ortega; R. W. Ostendorf; Y. Schutz; H. W. Wilschut

doi:10.1016/S0370-2693(02)01973-1

paper

Thermal Bremsstrahlung photons probing the nuclear caloric curve

arXiv:nucl-ex/0111008 · doi:10.1016/S0370-2693(02)01973-1

Abstract

Hard-photon (E $_{I^}^{3} >$ 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 $I^µ^{⋆} \approx$ 3{\it A} - 8{\it A} MeV shows lower values of $T$ than those expected for a Fermi fluid.

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