Bonn 2010 – wissenschaftliches Programm
HK 27.1: Gruppenbericht
Dienstag, 16. März 2010, 16:30–17:00, HG V
Correlation measurements in neutron decay. The PERC project — •Torsten Soldner — Physik-Department E18, TU München — Institut Laue Langevin, Grenoble
Neutron decay is well-understood in the Standard Model of particle physics. However, from measuring the neutron’s lifetime and angular correlations in the decay, we can not only derive parameters of the Standard Model but also search for new physics. I will briefly review the latest experiments at the Institut Laue Langevin that measured successfully beta-, neutrino- and proton asymmetry and the electron-neutrino correlation with experimental precisions of a few times 10−3, and discuss limitations of existing instruments. Then I will introduce the instrument project PERC, a clean, bright and versatile source of neutron decay products, designed to overcome these limitations. A strong longitudinal magnetic field collects charged decay products directly from inside a neutron guide. This combination provides the highest phase space density of decay products. A magnetic mirror serves to limit the phase space precisely, reducing related systematic errors. Sensitivity and applications of PERC will be discussed.