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HK: Physik der Hadronen und Kerne
HK 6: Kern- und Teilchen-Astrophysik
HK 6.7: Talk
Friday, March 4, 2005, 15:45–16:00, TU MA144
Loss and Depolarization Studies of Ultra-cold Neutrons — •Peter Fierlinger1, I. Altarev2, T. Brys1, M. Daum1, M. Gupta1, R. Henneck1, S. Heule1, M. Gupta1, M. Kasprzak1, K. Kirch1, M. Lasakov3, M. Makela4, A. Pichlmaier1, U. Straumann5 und A. Young6 — 1Paul Scherrer Institut, Villigen-PSI, Switzerland — 2Technische Universität München — 3Petersburg Nuclear Physics Institut — 4Virginia Institute of Technology — 5Universität Zürich — 6North Carolina State University
Storage and depolarization of ultra-cold neutrons (UCN), although important for numerous experiments in fundamental and particle physics, is still not fully understood. We have carried out an experiment based on a cylindrical storage vessel with a magnetic shutter on the bottom, gravity and material walls. The loss and depolarization probability per wall interaction of the stored UCN was measured as a function of energy and temperature. We tested diamond-like carbon (DLC) coatings on Aluminum and quartz as wall materials and compared them to Beryllium. We also made a storage container using DLC coatings on plastic and Aluminum foil. We found the DLC loss parameters to be comparable to Beryllium.