Mainz 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 42: Instrumentation

HK 42.6: Vortrag

Donnerstag, 22. März 2012, 18:00–18:15, P 3

Polarization of ultra-cold neutrons at PENeLOPE — •Daria Margiotta — Technische Universität München, Physics Department

The project PENeLOPE is currently under development at the Physics Department of Technische Universität München. It uses a magneto-gravitational trap for ultra-cold neutrons and aims to measure the lifetime of the free neutron with an accuracy equal to or better than 0,1 s.

One source of systematic errors is the presence of neutrons in the trap with "wrong" polarization. These neutrons are accelerated by the magnetic field towards the walls of the storage volume and will be lost.

Several possibilities have been investigated to get neutrons with the "right" spin direction. One of the examined options is using a magnetized foil. In order to not interfere with the magnetic field generated inside PENeLOPE, the positions of these polarizing devices within the experiment have been carefully evaluated.

In this talk a description of selected spin-flipping systems will be given, then issues related to their installation into the experiment will be discussed, together with calculations showing their effects on the measurement of neutron lifetime.

This work is supported by the Excellence Cluster "Origin and Structure of the Universe", the Deutsche Forschungsgemeinschaft and the Maier-Leibnitz-Laboratorium Garching.