Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Astroteilchenphysik

HK 63.3: Talk

Friday, March 23, 2012, 14:30–14:45, RW 3

Development of non-magnetic neutron guide for PERC — •Nataliya Rebrova — Physikalisches Institut, Universität Heidelberg

The future cold neutron beam station PERC (Proton Electron Radiation Channel) is developed for measurements of angular correlation coefficients in β-decay of free polarized neutrons with precision of about 10-4. The neutron guide within PERC (where the 'active decay volume' lies) should be non-depolarizing on the same level of 10-4. We present the current status of the development of non-magnetic neutron guides. We discuss possible non-magnetic supermirror coatings with nickel-molybdenum or nickel-vanadium alloys and titanium, or copper and titanium. We demonstrate the feasibility of using copper and titanium supermirrors. We present first results of depolarization measurements at the opaque test bench obtained with cold polarized neutrons, which are reflected once from a multilayer copper-titanium sample placed inside strong magnetic field.