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HK: Fachverband Hadronen und Kerne

HK 72: Nuclear Structure and Dynamics II

HK 72.8: Talk

Thursday, March 19, 2009, 18:30–18:45, H-ZO 50

Study of 15F energy levels — •Florence de Grancey and François de Oliveira — GANIL, CEA/DSM-CNRS/IN2P3, Caen, France

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 80keV. 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 12eV.

Analysis is still in progress.