München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 37: Kern- und Teilchen-Astrophysik
HK 37.7: Gruppenbericht
Mittwoch, 22. März 2006, 18:00–18:30, E
First Results with the Neutron Decay Spectrometer aSPECT — •Stefan Baeßler1, Heinz Angerer2, Fidel Ayala Guardia1, Michael Borg1, Klaus Eberhardt3, Ferenc Glück1, Werner Heil1, Igor Konorov2, Gertrud Konrad1, Naika Luquero Llopis1, Raquel Muñoz Horta1, Gerd Petzoldt2, Dennis Rich4, Martin Simson2, Yuri Sobolev1, Hans-Friedrich Wirth2, and Oliver Zimmer2 — 1Institut für Physik, Universität Mainz — 2Physik-Departement E18, TU München — 3Institut für Kernchemie, Universität Mainz — 4Forschungsreaktor FRM-2, TU München
The intention of the neutron decay spectrometer aSPECT is the measurement of the proton spectrum in the decay of free polarized neutrons. The proton spectrum is used to deduce the value of the neutrino electron correlation coefficient a, an important experimental quantity which is useful to resolve the problem with the unitarity of the Cabbibo-Kobayashi-Maskawa Matrix.
In a beam time at the neutron beam MEPHISTO of the research reactor FRM-2, the strongest cold neutron beam for neutron decay experiments has been set up, the retardation spectrometer has been mounted and a first proton spectrum has been measured. In my talk I will present the physical motivation, the design and optimization of the different components of our new spectrometer. I will discuss our results and their implications. I will finish with a discussion of possible further measurements.