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Thermal Bremsstrahlung photons probing the nuclear caloric curve

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arxiv nucl-ex/0111008 v2 pith:FA3KTWVM submitted 2001-11-15 nucl-ex

Thermal Bremsstrahlung photons probing the nuclear caloric curve

classification nucl-ex
keywords approxbremsstrahlungcaloriccurveemissionnuclearreactionsthermal
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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