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T: Fachverband Teilchenphysik

T 110: Niederenergie-Neutrinophysik/Suche nach Dunkler Materie 5

T 110.8: Vortrag

Mittwoch, 29. Februar 2012, 18:35–18:50, ZHG 102

The ν_e spectrum of the fission products of ²³⁸U — •Nils Haag, Lothar Oberauer, Stefan Schönert, and Klaus Schreckenbach — Technische Universität München

The ν_e’s emitted by a reactor core are produced in the subsequent beta decays of all fission products of the four main fuel isotopes ²³⁵U, ²³⁸U, ²³⁹Pu and ²⁴¹Pu. Since until now only three of these spectra are directly measured, one has to rely on calculations and simulations to predict reactor antineutrino spectra. A measurement of the last missing spectrum of ²³⁸U was performed with a γ-suppressing electron-telescope at the neutron source FRMII in Garching. As in the first phase the Double Chooz experiment is taking data with a single detector, this measurement on ²³⁸U lowers the systematical error significantly. In addition this spectrum is an important input to the discussion of the reactor antineutrino anomaly and sterile neutrinos. A reevaluation of the data now delivers the betaspectrum of ²³⁸U with an absolute calibration. In this talk, the accuracy as well as a conversion method into the ν_e spectrum will be discussed. This work is funded by the Excellence Cluster "Universe", the DFG Transregio 27: Neutrinos and beyond and the Maier-Leibnitz-Laboratorium Garching.