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Neutrino Oscillation Physics with a Stopped Pion/Muon Source

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Neutrino Oscillation Physics with a Stopped Pion/Muon Source. R.G. Van de Water, P-25 FNAL Proton Driver Conference Oct 6, 2004. Outline. Beyond the Standard Model with SBL oscillations. New high intensity stopped pion/muon sources. High precision tests of LSND, CPT, and sterile neutrinos.

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  1. Neutrino Oscillation Physics with a Stopped Pion/Muon Source R.G. Van de Water, P-25 FNAL Proton Driver Conference Oct 6, 2004

  2. Outline • Beyond the Standard Model with SBL oscillations. • New high intensity stopped pion/muon sources. • High precision tests of LSND, CPT, and sterile neutrinos. • Conclusions.

  3. Beyond the Standard Model • If MiniBooNE confirms LSND signal, strong indications of new physics, but what type? • Light – medium mass right handed n (sterile), can explain LSND anomaly, solar neutrino spectrum+Homestake anomaly, supernova R-process, pulsar kicks, dark matter, dark energy.... • 3+n models: • n=2 (hep-ph 0305255) favor m2 solutions at ~1 eV2 and ~20 eV2 • Need new high intensity short baseline neutrino experiments.

  4. Beyond the Standard Model • If MiniBooNE confirms LSND signal, strong indications of new physics, but what type? • CPT violation (hep-ph 0212116). • Mass varying n, mass depends on medium (hep-ph 0401099). • Lorentz violation, mass depends on direction (hep-ph 0406255). • Need new high intensity short baseline neutrino experiments.

  5. Short Baseline Tests of New Physics • Sterile neutrinos: • measure NC rates with a second detector. • CPT violation: • Run in antineutrino mode, compare P(e) to P(e). • Mass Varying neutrinos: • Oscillation probability depends on absence/presence of matter. Build tunnel to detector to be filled with water/air. • Lorentz Violation: • Oscillation probability depends on direction, look for sidereal effects.

  6. New Short Baseline Experiments and Sources • BooNE is a planned second detector for MiniBooNE, to improve measurement of mixing parameters and run in antineutrino mode. • Two detector setup at a stopped pion/muon source similar to LAMPF: • SNS at ORNL, will be online in 2008 (1.3 GeV, 1.4 MW, 695nsec). • FNAL proton driver, 8GeV, 2MW, short beam spill. • Advantages of a stopped pion neutrino source: • Low intrinsic background to a e appearance oscillations. • Well determined flux and energy spectrum. • Well known neutrino cross sections on Carbon.

  7. Stopped Pion/Muon Neutrino Source nucl-ex/0309014 hep-ex/0408135 • Neutrino Production from a Stopped Pion/Muon Source: FNAL ~2.5 x SNS

  8. Stopped Pion/Muon Neutrino Source • Neutrino Flux from a Stopped Pion/Muon Source:

  9. Neutrino Reactions from a Stopped Pion/Muon Source 250 ton mineral oil detector 60m from SNS source.

  10. Test of LSND Stopped Muon eOscillations (nucl-ex/0309014) • Single 250 ton mineral oil detector (ELVIS) at 60m from SNS source. • Oscillation e detected via ep -> n e+, then np -> d(2.2MeV). • Backgrounds/yr: 81 intrinsic e, ~9 DIF+cosmics.

  11. Measurement of Stopped Pion e Oscillations (nucl-ex/0309014) • Single 250 ton mineral oil detector (ELVIS) at 60m from SNS source. • Oscillation e detected via e12C -> e-12Ngs, then ~8 MeV beta (11msec). • Monoenergetic electron bump at 13 MeV (7% E resolution) on large background from stopped muon DAR e. • Test CPT by comparing with e measurement on previous slide.

  12. Sterile Neutrino Oscillations with Stopped Pions • If LSND oscillations is se, then we expect P( s) > 0.03. • Can detect all neutrinos via NC reaction, x 12C -> x12C*(15.11MeV). • Since we have monoenergetic source, then look for NC rate distortion as a function of L.

  13. Sterile Neutrino Oscillations with 12C-> 12C*(15.11MeV) SNS source L=50 cm

  14. Sterile Neutrino Oscillations Sensitivity with SNS Source Plot by Gordon McGregor (LANL)

  15. Sterile Neutrino Oscillations Sensitivity with FNAL 8GeV PD Plot by Gordon McGregor (LANL)

  16. Cross Section Measurements at SNS • -SNS proposal in the works to measure neutrino nucleus cross sections on Pb, Fe, Al, C, O, D2O. • Neutrino energies in the supernova type II core collapse region. This is important to studying the astrophysics of supernova, and for supernova neutrino detectors.

  17. Conclusions • If LSND is correct, there are many interesting/novel/bizarre models of oscillations beyond the standard model. • Most of these models can be tested with a new high intensity stopped pion/muon source. • SNS might get there first, but FNAL PD program would be more optimized/flexible for SBL oscillation physics. • Hope for interesting SBL oscillation physics in the next decade!