Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 19: Application of Nuclear Techniques I

HK 19.2: Vortrag

Montag, 16. März 1998, 17:15–17:30, G

Induced Polarization of Ultra Cold Neutrons — •H. Abele, A. Boucher, M. Klein, U. Schmidt, and C. Stellmach — Physikalisches Institut der Universit"at Heidelberg, Philosophenweg 12, D-69120 Heidelberg, Germany

An unpolarized Ultra Cold Neutron (UCN) beam becomes polarized after passing through a suitable RF-field and static magnetic field. In contrast to commonly used spin filtering polarizer both spin components of the initial unpolarized UCN beam will be found in one final spin state. Therefore the intensity of the polarized neutrons is enhanced up to a factor of two compared to a spin filtering polarizer. Liouville’s theorem is conserved due to the change in energy of one of the initial spin component. The efficiency of polarization is determined by the energy range and the divergence of the UCN and the homogeneity of the magnetic fields. Experimental results will be presented. Further more the rice of polarization in an initially unpolarized system is commonly regarded [1] as an indicator of parity nonconservation. In contrast to this general consideration the induced polarisation of UCN is an effect of purely electromagnetic origin and hence parity conserving.

[1] L. Stodolsky Phys.Lett. 50B, 352 (1974)