UCNA at LANL: Beta Asymm'

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UCNA at LANLBeta Asymm.
measured 2Hz decaying rate.
2007 Measure A to 1 RD for 0.2
measurement 2008 Measure A to 0.2
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Muon veto (gas counters)
1-Tesla Spectrometer
Beta detector (inside)
7-T Polarizer and Adiabatic-Fast Passage flipper
7-Tesla Pre-Polarz.
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Future plans I
proton detection? 1) neutrino asymmetry2)
extract l independent on polarization.
secondaries
e
UCN volume
p
e
e
charged-particle detector
e
converter foil

• 600-900Å thick polyamide
• 200Å Aluminum.
• 100Å LiF.
• Current dimensions roughly 7x7cm2

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Future plans II
Si detectors higher E resolution?measure
1) Fierz interference 2) weak magnetism