Measuring the proton spectrum in neutron decay - latest results with aSPECT

Details Measuring the proton spectrum in neutron decay - latest results with aSPECT Measuring the proton spectrum in neutron decay - latest results with aSPECT

2008-11-24

arxiv.org/abs/0811.3851v1

Physics

Nuclear Physics

Nuclear Experiment

Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 20

Scientific paper

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%.

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