Measurement of the antiproton to proton ratio in cosmic rays using the   Moon shadow with the L3+C detector
  The observation of the Moon shadow effect with the L3+C detector is reported. The expected offset and elongation of the Moon shadow due to the geomagnetic field are clearly observed. A determination of the angular resolution and pointing error has beem performed through this observation. A preliminary upper limit of the antiproton to proton ratio in cosmic rays is given in the TeV region. 
J.F. PARRIAUD (on behalf of the L3 collaboration)