Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

Abstract

We report experimental signals of Bose-Einstein condensation in the decay of hot Ca projectile-like sources 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 magnetic spectrometer, allowed us to reconstruct the mass, charge and excitation energy of the decaying hot 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 correlated to the excitation energy of the reconstructed system. The obtained results are consistent with the production of dilute mixed (bosons/fermions) systems, where bosons experience a smaller volume as compared to the surrounding fermionic gas. Our findings recall similar phenomena observed in the study of boson condensates in atomic traps.

Submitted to Phys. Rev. Lett. (december 2014)

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• Strongly Resonating Bosons in Hot Nuclei
• Alpha Conjugate Neck Structures in the Collisions of 35 MeV/nucleon 40Ca with 40Ca
• Phase diagram of alpha matter with Skyrme-like scalar interaction
• Fast trajectory reconstruction techniques for the large acceptance magnetic spectrometer VAMOS++
• Competition between fermions and bosons in nuclear matter at low densities and finite temperatures
• Triple α Resonances in the Decay of Hot Nuclear Systems *
• Bose-Einstein condensation in finite drops of alpha particles
• Temperature and Density Conditions for Alpha Clustering in Excited Self-Conjugate Nuclei