Speaker
Dr
Romain Maisonobe
(Institut Laue-Langevin)
Description
Free neutron decays into a proton, an electron and an antineutrino. This is a weak interaction process described by the V-A theory within the Standard Model. The beta decay of the neutron is parametrized by several measurable correlation coefficients which are related to parameters of the Standard Model and are used to search for new physics.
The spectrometer aSPECT was designed to measure the electron-antineutrino angular correlation coefficient a with a new accuracy of 0.3% (previous measurements reached an accuracy of 5%). The value of this coefficient is inferred from the shape of the proton recoil spectrum. The principle is to measure with high precision the integral proton spectrum using magnetic adiabatic collimation and electrostatic retardation.
Data acquisition for a 1% measurement was performed during a beam-time in 2013 at the Institut Laue-Langevin in Grenoble. The analysis is ongoing to study different systematic effects and the accuracy in the extraction of the coefficient a. Dedicated measurements or simulations were conducted to determine background, edge effect, magnetic and electric fields, etc.
The experiment and preliminary results are presented in this poster.
Author
Dr
Romain Maisonobe
(Institut Laue-Langevin)
Co-authors
Alexander Wunderle
(Johannes Gutenberg-Universität)
Mr
Christian Schmidt
(Johannes Gutenberg-Universität)
Ferenc Glück
(K)
Gertrud Konrad
(TU Wien)
Marcus Beck
(WWU Muenster)
Dr
Martin Simson
(Institut Laue-Langevin)
Michael Klopf
(TU Wien)
Prof.
Oliver Zimmer
(Institut Laue-Langevin)
Mrs
Pilar Guimera-Milan
(Institut Laue-Langevin)
Mr
Romain Virot
(Institut Laue-Langevin)
Stefan Baessler
(University of Virginia)
Dr
Torsten Soldner
(Institut Laue-Langevin)
Prof.
Werner Heil
(Johannes Gutenberg-Universität)
