Measurement of Neutron Decay Parameters—The abBA Experiment

We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(−4). The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the prot...

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Detalles Bibliográficos
Autores principales: Wilburn, W. S., Bowman, J. D., Mitchell, G. S., O’Donnell, J. M., Penttila, S. I., Seo, P.-N., Calarco, J. R., Hersmann, F. W., Chupp, T. E., Cianciolo, T. V., Rykaczewski, K. P., Young, G. R., De Souza, R. T., Snow, W. M., Desai, D., Greene, G. L., Grzywacz, R. K., Frlez, E., Pocanic, D., Gentile, T. R., Gudkov, V., Jones, G. L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology 2005
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4852843/
https://www.ncbi.nlm.nih.gov/pubmed/27308155
http://dx.doi.org/10.6028/jres.110.058
Descripción
Sumario:We are developing an experiment to measure the correlations a, A, and B, and the Fierz interference term b in neutron decay, with a precision of approximately 10(−4). The experiment uses an electromagnetic spectrometer in combination with two large-area segmented silicon detectors to detect the proton and electron from the decay in coincidence, with 4π acceptance for both particles. For the neutron-polarization-dependent observables A and B, precision neutron polarimetry is achieved through the combination of a pulsed neutron beam, under construction at the SNS, and a polarized (3)He neutron polarizer. Measuring a and A in the same apparatus provides a redundant determination of λ = g(A)/g(V). Uncertainty in λ dominates the uncertainty of CKM unitarity tests.

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