Study of 15F energy levels

Energy levels of 15F have been studied by resonant elastic scattering in inverse kinematic. A 84MeV 14O radioactive ions beam was produced by SPIRAL facility with an intensity of 105 particles per second and was sent onto a thick 150 um polypropylene target. Energy calibration was obtained using resonances from resonant elastic scattering measurement of 14N stable beam. The two lowest resonances in 15F were seen at 1.35 MeV and 2.78 MeV resonant energies, consistent with previous measurements. Moreover, a destructive resonance has been measured at an resonant energy of 4.78 MeV, which correspond to the second excited. Its total width has been estimated at 80 keV. At this energy, this state is located 160 keV below 13N+2p threshold, opening the channel for diproton decay. Several events of diproton decay coming from this second excited state have been observed and interpreted as sequential decay via a virtual state in 14O. Experimental width for this diproton emission has been estimated at 12 eV. Analysis is still in progress.