A new measurment of the $\bar\nu_{e}e^{-}$ elastic cross section at very low energy

• Published in: Physics letters. B Vol. 545; pp. 57 - 61
• Main Authors: Amsler, C., Avenier, M., Broggini, C., Busto, J., Cerna, C., Daraktchieva, Z., Gervasio, G., Jeanneret, P., Jonkmans, G., Koang, D.H., Lamblin, J., Lebrun, D., Link, O., Ould-Saada, F., Puglierin, G., Stutz, A., Tadsen, A., Vuilleumier, J.L.
• Format: Journal Article
• Language: English
• Published: Elsevier 2002
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693
• DOI: 10.1016/S0370-2693(02)02560-1

We have built a low background detector, a time projection chamber surrounded by an active anti-Compton, to measure the ν e e − elastic cross section down to the antineutrino energy of 900 keV. With our detector, running at 18 m from the core of a nuclear reactor in Bugey, we could detect reactor antineutrinos by measuring both the energy and the direction of the recoiling electrons. We report here on a first analysis of the data using an automatic scanning procedure. The results we obtain are 1.5 σ higher than the ones predicted by the standard model. (Elsevier)