Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 21: Weak Interaction and Fundamental Symmetries I

HK 21.2: Talk

Monday, March 16, 1998, 17:15–17:30, J

Localization of ultracold neutrons and the question of T-invariance — •H. Abele¹, A. Boucher¹, D. Dubbers¹, P. Geltenbort², U. Schmidt¹, and Chr. Stellmach¹ — ¹Physikalisches Institut der Universit"at Heidelberg Philosophenweg 12, D-69120 Heidelberg, Germany — ²Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France

Waves in disordered systems can, at a sufficiently high degree of disorder, make a socalled Anderson phase-transition into a localized state. This effect of ”strong localization” by which quantum diffusion is suppressed, is difficult to investigate whereas the precursor effect of ”weak localization” has been investigated thoroughly both for electrons and for photons. We show that ultracold neutrons in disordered mesoscopic materials should have a high propensity for strong localization. Further a small T-violating amplitude in the neutron-nuclear interaction can have a strong effect on the signature of weak localization of ultracold neutrons. We present the results of a first experimental feasibility study.