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Published May 2005 | Submitted
Journal Article Open

Measurement of the shadowing of high-energy cosmic rays by the Moon: A search for TeV-energy antiprotons

Abstract

The shadowing of high-energy cosmic rays by the Moon has been observed with a significance of 9.4 standard deviations with the L3 + C muon spectrometer at CERN. A significant effect of the Earth magnetic field is observed. Since no event deficit on the east side of the Moon has been observed, an upper limit at 90% confidence level on the antiproton to proton ratio of 0.11 is obtained for primary energies around 1 TeV.

Additional Information

© 2005 Elsevier B.V. Received 8 December 2004, Revised 28 January 2005, Accepted 3 February 2005, Available online 16 March 2005. Supported also by the Comisión Interministerial de Ciencia y Tecnología. Supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie. Supported by the Hungarian OTKA fund under contract numbers T019181, F023259 and T037350. Supported by the National Natural Science Foundation of China. Also supported by the Hungarian OTKA fund under contract number T026178. Also supported by CONICET and Universidad Nacional de La Plata, CC 67, 1900 La Plata, Argentina. Also supported by the Hungarian OTKA fund under contract number T026178. We wish to acknowledge the contributions of all the engineers and technicians who have participated in the construction and maintenance of the L3 and L3 + C experiments. Those of us who are not from member states thank CERN for its hospitality and help.

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August 19, 2023
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October 25, 2023