Measurement of the neutron beta decay asymmetry using ultracold neutrons
Data(s) |
2014
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Resumo |
The free neutron beta decay correlation A<sub>0</sub> between neutron polarization and electron emission direction provides the strongest constraint on the ratio λ = g<sub>A</sub>/g<sub>V</sub> of the Axial-vector to Vector coupling constants in Weak decay. In conjunction with the CKM Matrix element V<sub>ud</sub> and the neutron lifetime τ<sub>n</sub>, λ provides a test of Standard Model assumptions for the Weak interaction. Leading high-precision measurements of A<sub>0</sub> and τ<sub>n</sub> in the 1995-2005 time period showed discrepancies with prior measurements and Standard Model predictions for the relationship between λ, τ<sub>n</sub>, and V<sub>ud</sub>. The UCNA experiment was developed to measure A<sub>0</sub> from decay of polarized ultracold neutrons (UCN), providing a complementary determination of λ with different systematic uncertainties from prior cold neutron beam experiments. This dissertation describes analysis of the dataset collected by UCNA in 2010, with emphasis on detector response calibrations and systematics. The UCNA measurement is placed in the context of the most recent τ<sub>n</sub> results and cold neutron A<sub>0</sub> experiments. |
Formato |
application/pdf |
Identificador |
http://thesis.library.caltech.edu/8479/1/Mendenhall_2014_Thesis.pdf Mendenhall, Michael Praetorius (2014) Measurement of the neutron beta decay asymmetry using ultracold neutrons. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:06042014-132823956 <http://resolver.caltech.edu/CaltechTHESIS:06042014-132823956> |
Relação |
http://resolver.caltech.edu/CaltechTHESIS:06042014-132823956 http://thesis.library.caltech.edu/8479/ |
Tipo |
Thesis NonPeerReviewed |