0000000000006123

AUTHOR

F. Ayala Guardia

showing 3 related works from this author

The Proton Spectrum in Neutron Beta Decay: Latest Results with the aSPECT Spectrometer

2009

Abstract The purpose of the neutron decay spectrometer aSPECT is to determine the antineutrino electron angular correlation coefficient a with high precision. Latest measurements with aSPECT were performed during April/May 2008 at the Institut Laue-Langevin in Grenoble, France. In this paper we give a report on the experiment and the status of the ongoing data analysis.

PhysicsNuclear and High Energy PhysicsParticle physicsSpectrometerProtonCabibbo–Kobayashi–Maskawa matrixSpectrum (functional analysis)ElectronBeta decayPhysics::GeophysicsNuclear physicsAngular correlationNeutronNuclear ExperimentNuclear Physics A
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Measuring the proton spectrum in neutron decay - latest results with aSPECT

2008

The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free neutron decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%.

PhysicsNuclear and High Energy PhysicsSpectrometerProtonCabibbo–Kobayashi–Maskawa matrixFOS: Physical sciencesElectronMeasure (mathematics)Nuclear physicsNeutronNuclear Experiment (nucl-ex)Nuclear ExperimentInstrumentationNuclear ExperimentOrder of magnitudeBeam (structure)
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Improved determination of the β−ν¯e angular correlation coefficient a in free neutron decay with the aSPECT spectrometer

2020

We report on a precise measurement of the electron-antineutrino angular correlation ($a$ coefficient) in free neutron beta-decay from the $a$SPECT experiment. The $a$ coefficient is inferred from the recoil energy spectrum of the protons which are detected in 4$\pi$ by the $a$SPECT spectrometer using magnetic adiabatic collimation with an electrostatic filter. Data are presented from a 100 days run at the Institut Laue Langevin in 2013. The sources of systematic errors are considered and included in the final result. We obtain $a = -0.10430(84)$ which is the most precise measurement of the neutron $a$ coefficient to date. From this, the ratio of axial-vector to vector coupling constants is …

PhysicsCoupling constantSpectrometer010308 nuclear & particles physicsSpectrum (functional analysis)Lambda01 natural sciencesCollimated lightFilter (large eddy simulation)0103 physical sciencesNeutronAtomic physicsNuclear Experiment010306 general physicsAdiabatic processPhysical Review C
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