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Uncertainty for NPDGamma experiment in reaction

Uncertainty for NPDGamma experiment in reaction. Pil-Neyo Seo U of Virginia/TUNL. HIGS2 Workshop, June 3-4, 2013. NPDGamma experiment. NPDGamma experiment. , where. Uncertainties in NPDGamma experiment. -Statistical uncertainty : associated with detected gamma rays, unavoidable

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Uncertainty for NPDGamma experiment in reaction

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  1. Uncertainty for NPDGamma experiment in reaction Pil-Neyo Seo U of Virginia/TUNL HIGS2 Workshop, June 3-4, 2013

  2. NPDGamma experiment

  3. NPDGamma experiment , where

  4. Uncertainties in NPDGamma experiment -Statistical uncertainty : associated with detected gamma rays, unavoidable : limit by beam intensity and detector solid angle : electronic noise and drift was small compared to counting statistics LANSCE SNS

  5. Uncertainties in NPDGamma experiment -Systematic uncertainty : not associated with the beam : gain drift and additive couplings (mag field on detector gain, leakage of control signal into preamp, shift in main voltage when pwr supply on and off…) - additive couplings diagnosed by no beam for up-down asymmetry - gain drift by illuminating a detector with light - isolating PV signal from neutron spin flip

  6. Main handle to control systematic uncertainty : frequent reversal of neutron polarization spin direction in match with beam pulse frequency B=

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