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HK: Physik der Hadronen und Kerne
HK 37: Postersitzung / Instrumentation und Anwendungen II
HK 37.27: Poster
Wednesday, March 24, 1999, 10:15–12:00, Foyer
Opaque neutron spin filters of polarized 3He and polarized protons — •T.M. Müller1,2, P. Hautle3, W. Heil1, and O. Zimmer1 — 1Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9 — 2Physikalisches Institut, Philosophenweg 12, D-69120 Heidelberg — 3Paul-Scherrer-Institut, CH-5232 Villigen
For many experiments testing the standard model in the free neutron decay a precise knowledge of the neutron polarization is required.
Standard techniques using the spin dependent reflection of neutrons in so called supermirrors are reported to be limited in principle to a precision of 0.2% [1]. The accuracy to which the neutron polarization is measured with this technique in neutron decay experiments limits nowadays the determination of the weak coupling constants from the neutron data.
With a new method using opaque spin filters as analysers we measured the polarization of a white beam of cold neutrons with an accuracy of better than 0.04% using polarized 3He and protons respectively [2] and compared this to the result obtained in the same experiment with the supermirror method described in [1].
[1] A.P.Serebrov, ’New method for precise determination of neutron beam polarization’, NIM A357 (1995) 503-510
[2] O.Zimmer, P.Hautle, W.Heil, T.M.Müller, ’Neutron polarization analysis using opaque spin filters’, to be published in Physical Letters B