Speaker
Description
Karishma Dhanmeher – for the BRAND Collaboration
Institute of Physics, Jagiellonian University, Kraków, Poland,
Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland,
Institute of Nuclear and Radiation Physics, KU Leuven, Belgium,
Institut Laue-Langevin, Grenoble, France,
Department of Chemistry - TRIGA site, Johannes Gutenberg University Mainz, Mainz,
Germany
Department of Physics and Astronomy, North Carolina State University, Raleigh, USA
Abstract:
The BRAND experiment aims at the search of Beyond Standard Model (BSM)
physics via measurement of exotic components of weak interaction. For this
purpose, eleven correlation coefficients of neutron beta decay will be measured
simultaneously. Seven of them: H, L, N, R, S, U and V, are sensitive to the
transverse polarization of electrons from free neutron decay. The correlation
coefficients will be derived using Mott polarimetry and completely determined
kinematics of products from the polarized neutron beta decay. For this aim the
beam of cold polarized neutrons available in PF1B areal at ILL, Grenoble will
be utilized.
The electron detection system features both the tracking and energy measure-
ment capability as well as the Mott polarimetry for determination of the electron
spin orientation. The 3D tracking is performed with a low density, helium based
drift chamber of a hexagonal cell structure which is optimized for beta particles.
The Mott polarimeter is an integral part of the tracker. It consists of a thin Pb
foil installed inside, the drift chamber and two plastic scintillators, providing
trigger and scattered electron energy measurement.
The results of the first pilot run of the BRAND experiment performed in Septem-
ber ’20 will be reported with emphasis on the description and the performance
of the electron detection system and the Mott polarimeter.
