122075081
Solar neutrino results from borexino
Abstract Borexino is a large-volume liquid scintillator experiment for low energy neutrino detection, operating since May 2007, and installed at the National Laboratory of Gran Sasso. Borexino is the first experiment able to observe in real-time Solar neutrino interactions also in the sub-MeV range. We report with this work the main results achieved in the Solar neutrino sector by Borexino. In particular, we report the results on the measured interaction rates of 7 Be, 8 B, and pep neutrinos, and their impacts on the physics of neutrino oscillations.
121900736
THE BOREXINO DETECTOR
122653467
Fusion of 28Si + 28Si: oscillations above the barrier and the behavior down to 1μb
Fusion excitation functions of light heavy-ion systems show oscillatory struc- tures above the Coulomb barrier, caused by resonances or due to the penetration of suc- cessive centrifugal barriers well separated in energy. In heavier systems, the amplitude of oscillations decreases and the peaks get nearer to each other. This makes the measure- ments very challenging. We have performed a first experiment for 28 Si + 28 Si, by measuring fusion cross sections ( ) in an energy range of'15 MeV above the barrier, with a small Elab = 0.5 MeV step. Three regular oscillations are clearly observed, which are best revealed by plotting the energy-weighted derivative of the excitation function. The excitation function has been recently measured down to cross sections 1 b with larger energy steps. Coupled-channel (CC) calculations based on a shallow potential in the entrance channel are able to reproduce the oscillations. A further analysis will provide a stringent test for the calculations, in particular for the choice of the ion-ion potential, because the sub- barrier excitation function has to be reproduced as well.