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HK: Fachverband Hadronen und Kerne
HK 74: Fundamental Symmetries
HK 74.7: Vortrag
Donnerstag, 19. März 2009, 18:15–18:30, H-ZO 70
Search for Tensor Type Weak Currents by Measuring the Beta Asymmetry Parameter in Nuclear Beta Decay — •Frederik Wauters1, Nathal Severijns1, Emil Traykov1, Simon Van Gorp1, Michael Tandecki1, Ilya Kraev1, Peter Herzog2, and Dalibor Zakoucky3 — 1Katholieke Universiteit, Leuven, Belgium — 2Helmholtz-Institut fur Strahlen- und Kernphysik, Universität Bonn, Germany — 3Nuclear Physics Institute, Rez, Czech Republic
Measuring the beta-asymmetry parameter A for pure Gamov-Teller nuclear decays is sensitive to a tensor component in the weak interaction if it is determined at the 1 % precision level. We will present a new method to measure this parameter and competitive with the best results available in literature. The low temperature nuclear orientation technique is used to orient an ensemble of polarize an ensemble of radioactive nuclei. The beta decay is observed by semiconductor detectors operating at temperatures of about 10K looking directly to the sample. In previous measurements the precision was limited to a few percent by scattering of the beta particles and deflection by he magnetic field. We have developed a method based on GEANT4 Monte-Carlo simulations to gain control over these effects. First results were obtained with 114In and 60Co. The precision is currently at the 1,5% level which is better then the current literature values. The method is further being improved to push the precision and new data is under analysis. Our goal is to reach the 1% level or better.