Münster 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 44: Fundamentale Symmetrien
HK 44.7: Gruppenbericht
Mittwoch, 23. März 2011, 18:30–19:00, HS2
WITCH - a declaration of independence — •Martin Breitenfeldt — IKS, KU Leuven, Belgium
The WITCH set-up (Weak Interaction Trap for CHarged particles) installed at ISOLDE/CERN combines a double Penning trap system to store radioactive ions and a retardation spectrometer to probe the energy distributions of the daughter recoil ions [1]. This energy spectrum provides information of the beta-neutrino angular correlation coefficient a. A precise determination of a gives information about an admixture of exotic components of the weak interaction.
In the last years the WITCH set-up was upgraded and further optimized to allow measurements with the mirror nucleus 35Ar. A first such measurement was already performed and allowed the investigation of systematic and unwanted effects in the system. These were compared with simulations for finding their origin and to implement countermeasures in the WITCH system.
Furthermore a tremendous effort was taken to allow an independent operation from neighboring experiments. This includes the installation of a 20 m2 magnetic shielding.
[1] M. Beck et al., Nucl. Instrum. and Meth. A 503 (2003) 569.