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Creators/Authors contains: "Macsai, Nick"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
    Precision measurements of observables in neutron β decay are used to test the standard model description of the weak interaction and search for evidence of new physics. The Nab experiment at the Fundamental Neutron Physics Beamline at the Spallation Neutron Source was constructed to measure correlations in neutron decay by utilizing an asymmetric spectrometer and novel detection system to accurately reconstruct the proton momentum and electron energy for each β decay. This work describes the detection of neutron β -decay products in the Nab spectrometer and presents the first full Dalitz plot representation of the phase space of neutron β decay for all electrons > 100 keV. In addition, new constraints are placed on a possible excited neutron state, hypothesized to explain the disagreement between the appearance and disappearance neutron lifetime techniques. 
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  2. ; ; ; ; ; ; ; ; ; ; et al (, Physical Review C)
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  3. ; ; ; ; ; ; ; ; ; ; et al (, EPJ Web of Conferences)
    Hüsken, N; Danilkin, I; Hagelstein, F (Ed.)
    The current three sigma tension in the unitarity test of the Cabbibo-Kobayashi-Maskawa (CKM) matrix is a notable problem with the Standard Model of elementary particle physics. A long-standing goal of the study of free neutron beta decay is to better determine the CKM elementVudthrough measurements of the neutron lifetime and a decay correlation parameter. The Nab collaboration intends to measurea, the neutrino-electron correlation, with accuracy sufficient for a competitive evaluation ofVudbased on neutron decay data alone. This paper gives a status report and an outlook. 
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