Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 19: Application of Nuclear Techniques I

HK 19.1: Talk

Monday, March 16, 1998, 17:00–17:15, G

Tunneling time and anormalous Lamor precession of Ultra Cold Neutrons — •H. Abele, D. Dubbers, M. Klein, U. Schmidt, R. Simon, and C. Stellmach — Physikalisches Institut der Universit"at Heidelberg, Philosophenweg 12, D-69120 Heidelberg, Germany

For Ultra Cold Neutrons (UCN) penetrating a thin ferromagnetic layer the coupling between spin and spatial wave function is not negligible. Here the kinetic energy of UCN is of the same order of magnitude than the energy of Zeeman splitting in a strong magnetic field. This leads to an additional phase of the precession angle of polarized UCN compared to the normal Lamor precession. Even if the potential barrier of the ferromagnetic layer is higher than the kinetic energy of the UCN the precession angle is still observable. Due to the fact that the precession angle is proportional to the flight time through a magnetic field, tunneling time for UCN penetrating a ferromagnetic layer can be measured. First experimental results will be presented.