Development of silicon detectors for neutron beta decay studies

Details Development of silicon detectors for neutron beta decay studies Development of silicon detectors for neutron beta decay studies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri13003w&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

A fundamental characteristic of the electroweak interaction is universality, which is manifest in the unitarity of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. A deviation from unitarity would indicate the presence of interactions beyond those of the standard model. At present, the precision to which CKM unitarity can be checked is limited by experimental knowledge of V_ud, the first diagonal element. Measurement of the electron-asymmetry A in neutron β-decay offers the best route for improving this situation. The availability of pulsed cold neutron beams for nuclear physics, as well as advances in neutron polarizers and silicon detectors, will make order-of-magnitude improvements in the determination of V_ud possible. Large area thin dead layer silicon detectors allow the electron and proton from neutron decay to be detected in coincidence, greatly reducing background and providing an phin situ measurement of residual background. As part of the development of such an experiment, we have used silicon detectors to observe electron-proton coincidences from neutron decay. The results of this test will be described.

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