Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Astroteilchenphysik
HK 43.1: Gruppenbericht
Dienstag, 5. März 2013, 16:45–17:15, HSZ-401
Precision measurements of neutron decay observables with PERC — •Bastian Märkisch — Physikalisches Institut, Universität Heidelberg
Neutron beta decay is the simplest semi-leptonic weak process, and precision measurements of angular correlations coefficients provide unique information about the weak interaction and contribute significantly to precision tests of the Standard Model of particle physics.
We present the new facility PERC (Proton Electron Radiation Channel), a novel source of neutron decay products, which is currently under construction at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz. PERC will provide the maximum available phase space density of neutron decay products by using the inside of an 8 m long neutron guide as active decay volume. Electrons and protons are extracted from this volume, and separated from the neutron beam by a strong magnetic field. A magnetic barrier field of up to 6 T serves to precisely define the phase space of the emerging decay particles. Spectra and angular distributions will be distortion-free on the level of 10−4, an improvement of more than an order of magnitude compared to existing instruments.
We give an overview on the concept of the PERC instrument, observables accessible, and the current status.