Deutsche Tagung f ¨ur Forschung mit ... - SNI-Portal

Teilchen und Kerne Poster: Do., 13:00–15:30 D-P412
Fundamental physics with ultra cold neutrons UCN
I. Altarev 1 , A. Frei 1 , E. Gutsmiedl 1 , F.J. Hartmann 1 , A.R. Müller 1 , S.
Paul 1 , R. Picker 1 , W. Schmid 1 , D. Tortorella 1 , O. Zimmer 1
1 Physik-Department E18, Technische Universität München, James-Franck-Strasse,
85748 Garching
Ultracold Neutrons (UCN), i.e. neutrons with kinetic energies of less than 300 neV
(corresponding to velocities of less than 7 m/s) can be created by down-scattering
of cold neutrons in a solid-deuterium moderator. They may be stored in material
or magnetic bottles and studied for times approaching the eta-decay lifetime of the
neutron aun. From measurements of aun and eta-decay decay correlation coefficients,
one may extract parameters that completely characterize the weak force and can search
for deviations from the Standard Model and the unitarity of the quark mixing matrix.
Measurement of the lifetime aun also provides information on the abundances of the
light elements produced during the Big Bang.
A general description of the experimental set-up for the miniD2 UCN source and
the planned lifetime experiment PENELOPE, both for the FRM2 research reactor at
Garching near Munich will be presented.