Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems
Résumé
We report experimental signals of Bose-Einstein condensation in the decay of hot Ca projectilelikesources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup,constituted by the coupling of the INDRA 4$\pi$ detector array to the forward angle VAMOS magneticspectrometer, allowed us to reconstruct the mass, charge and excitation energy of the decayinghot projectile-like sources. Furthermore, by means of quantum fluctuation analysis techniques,temperatures and mean volumes per particle as seen by bosons and fermions separately are correlatedto the excitation energy of the reconstructed system. The obtained results are consistent with theproduction of dilute mixed (bosons/fermions) systems, where bosons experience a smaller volumeas compared to the surrounding fermionic gas. Our findings recall similar phenomena observed inthe study of boson condensates in atomic traps.