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HK: Physik der Hadronen und Kerne

HK 4: Nuclear and Particle Astrophysics I

HK 4.4: Vortrag

Montag, 11. März 2002, 17:45–18:00, C

Final results of the KARMEN experiment on the search for ν_µ → ν_e oscillations — •Markus Steidl — Forschungszentrum Karlsruhe, Institut für Kernphysik

The final results from the KARMEN2 experiment in its search for ν_µ → ν_e oscillation are presented. The KARMEN2 experiment has been performed from 1997 until 2001 at the spallation neutron source ISIS of the Rutherford Laboratorium (UK). Beamstop Neutrinos ν_e, ν_µ und ν_µ with energies up to 52 MeV from the π⁺–µ⁺ decay chain are used for the search of neutrino oscillations. The very low ISIS beam contamination with ν_e leads to a high sensitivity in the appearance channel ν_µ → ν_e . Events induced by ν_e are detected in the 56 t liquid scintillator KARMEN detector via the p ( ν_e , e⁺ ) n reaction. As the KARMEN2 search yields clearly no hints for the presence of an oscillation signal, stringent limits on the oscillation parameters sin²(2θ) and Δ m² are set. These final KARMEN2 results are then combined with the final results of the LSND experiment, which claims observed evidence in this oscillation channel. The combined analysis allows the investigation of the statistical compatibility of the two experiments and the construction of a combined confidence interval on the allowed oscillation parameters sin²(2θ) and Δ m².