Speaker
Tomica Porobic
(Katholieke Universiteit Leuven (BE))
Description
One of the goals of precision measurements in nuclear beta-decay is searching for deviations from the Standard Model that could point to new physics. The primary aim of WITCH experiment [1] at the ISOLDE/CERN facility is the search for a scalar interaction in beta-decay by a precise (0.5%) determination of the beta-neutrino angular correlation coefficient, a, which would constrain a possible scalar contribution to less than 10%. For that purpose, a scattering-free source made of two Penning traps is combined with a MAC-E filter to probe the energy of recoiling daughter nuclei. First daughter recoil spectrum was obtained in June 2011 in the decay of 35Ar, allowing for a first albeit still crude determination of a. In this talk, subsequent upgrades of the system and the results of the latest online run (November 2012) will be presented.
[1] M. Beck et al., Eur. Phys. J. A47(2011) 15
Primary author
Tomica Porobic
(Katholieke Universiteit Leuven (BE))
Co-authors
Andreas Knecht
(CERN)
Christian Weinheimer
(Westfaelische Wilhelms-Universitaet Muenster (DE))
Claire Couratin
(LPC Caen)
Dalibor Zakoucky
(Acad. of Sciences of the Czech Rep. (CZ))
Etienne Liénard
(LPC Caen)
Ferenc Glück
(KIT)
Gergelj Soti
(Katholieke Universiteit Leuven (BE))
Gilles Ban
(LPC Caen)
Marcus Beck
(Universität Mainz)
Martin Breitenfeldt
(Katholieke Universiteit Leuven (BE))
Michael Tandecki
(Inst. voor Kern- en Stralingsfysica - Katholieke Universiteit Le)
Nathal Severijns
(Katholieke Universiteit Leuven (BE))
Paul Finlay
(Katholieke Universiteit Leuven (BE))
Peter Friedag
(Westfaelische Wilhelms-Universitaet Muenster (DE))
Simon Van Gorp
(Inst. of Physical and Chemical Res. (JP))
Valentin Kozlov
(KIT - Karlsruhe Institute of Technology (DE))
Xavier Fabian
(LPC Caen)
Xavier Fléchard
(LPC Caen)
