Speaker
Description
We propose to study annihilation on three nucleons, p3He→ pn, for which no data exist. The annihilation mechanism is not well known with two competing models on the market, rescattering which involves hadrons, and fireball which involves quarks. The branching fraction is predicted to be around 10(−6) for the latter, compared to 10(-7)–10(-8) for rescattering. The experiment requires a continuous (DC) antiproton beam of 100 – 200 keV which is not available at this time, but is part of a possible consolidation programme of the AD/ELENA complex. The anticollinear 1 GeV nucleons will be detected by a detector made of scintillation counters. The detection efficiency forp 3He→ pn is 11% and the background rejection 108. The counting time for the fireball model is roughly estimated to be around 10 minutes for 1 Pontecorvo event.
| Contribution area | New proposed Measurement |
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