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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.19: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Proton detection in aSPECT — •Gerd Petzoldt1, Stefan Baeßler2, Jim Byrne3, Ferenc Glück2, Joachim Hartmann1, Werner Heil2, Raquel Muñoz Horta2, Igor Konorov1, Marius Orlowski2, Yuri Sobolev2, Maurits van der Grinten3, and Oliver Zimmer11Physik Department E18, Technische Universität München — 2Institut für Physik, Universität Mainz — 3University of Sussex, Falmer, Brighton, UK

Present neutron decay data indicates that unitarity tests of the Cabbibo-Kobayashi-Maskara matrix fail by about 3σ. With the retardation spectrometer aSPECT, we will measure the electron-antineutrino correlation coefficient in neutron decay a by determinig the shape of the proton recoil spectrum, which is sensitive to a. We hope to increase the precision of the measurement by at least one order of magnitude, compared to older experiments. Determinig the upper left element Vud from a will allow an independent test of CKM unitarity.

The measurement requires a very sensitive detection system. We will use segmented Si-PIN diodes, which allows us to supress correlated electron background by applying an E×B drift in front of the detector. The structure also reduces capacitive noise of the detector. For the readout of the detector, a fast, low-noise electronics has been developped.

The detection system and calculations on the systematic effects on a to be expected from the detector properties, will be presented in this poster.

This work is supported by the MLL Garching and the BMBF.

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