Speaker
Mr
Romain MAISONOBE
(Institut Laue-Langevin)
Description
The retardation spectrometer aSPECT measures the proton recoil spectrum in free neutron β-decay with high precision. From this spectrum the electron-antineutrino angular correlation coefficient a can be extracted and used to derive the ratio λ = gA / gV of the weak coupling constants. For this high precision measurement, a good understanding of the background is indispensable.
In 2012 the spectrometer was operated without neutron beam, allowing to thoroughly investigate the background. Measurements were performed to evaluate the background behavior for different electrode voltage settings and vacuum conditions. In order to simulate the rest-gas ionization by electrons from neutron decay a beta source (activated gold foil) was used. This study was continued under beamtime conditions, at the neutron beam PF1b at the Institut Laue-Langevin in 2013.
We present results and first conclusions of these investigations.
Primary author
Mr
Romain MAISONOBE
(Institut Laue-Langevin)
Co-authors
Mr
Alexander Wunderle
(Institute of Physics, Uni Mainz)
Mr
Christian Schmidt
(Johannes Gutenberg-Universität Mainz)
Christine Klauser
(ILL)
Dr
Ferenc Glück
(KIT, Karlsruhe)
Ms
Gertrud Konrad
(University of Mainz, Mainz, Germany)
Mrs
Jacqueline Erhart
(Atominstitut Wien)
Dr
Marcus Beck
(Helmholtz-Institut Mainz and Johannes Gutenberg Universität Mainz)
Dr
Martin Simson
(Institut Laue-Langevin)
Mr
Michael Klopf
(Atominstitut Wien)
Mr
Romain Virot
(Institut Laue-Langevin)
Dr
Stefan Baeßler
(University of Virginia, Virginia, USA)
Torsten Soldner
(TU München)
Prof.
Werner Heil
(Institute of Physics)
