NPDGamma: A Measurement of the Parity Violating Directional {gamma}-Ray Asymmetry in Polarized Cold Neutron Capture on Hydrogen

The NPDGamma experiment aims to measure the correlation between the neutron spin and the direction of the emitted photon in neutron-proton capture at low momentum transfer. An up-down parity violating asymmetry from this process can be related to the strength of the hadronic weak interaction between...

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Bibliographic Details
Published in:AIP conference proceedings 2009-08, Vol.1149 (1)
Main Author: Fomin, Nadia
Format: Article
Language:English
Subjects:
ASYMMETRY
CAPTURE
COLD NEUTRONS
CORRELATIONS
GAMMA RADIATION
MOMENTUM TRANSFER
NUMERICAL ANALYSIS
P INVARIANCE
PARITY
PHOTON EMISSION
PHOTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTON-NEUTRON INTERACTIONS
PROTONS
SPIN
WEAK INTERACTIONS
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Summary:The NPDGamma experiment aims to measure the correlation between the neutron spin and the direction of the emitted photon in neutron-proton capture at low momentum transfer. An up-down parity violating asymmetry from this process can be related to the strength of the hadronic weak interaction between nucleons.The first phase of the experiment was completed in 2006 at LANSCE. The methodology will be discussed and preliminary results will be presented. The next run will start in 2009 at the SNS at ORNL with many improvements that will yield a measurement with a projected statistical error of 1x10{sup -8}, 20% of the predicted value for the asymmetry. This will allow the determination of the long range n contribution in the weak interaction between nucleons.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.3215634