Minera a High Precision NeutrinoNucleus Scattering Experiment at Fermilab

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Miner?a a High Precision Neutrino-Nucleus
Scattering Experiment at Fermilab

• Robert Bradford
• University of Rochester
• FCP 05

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Miner?a - ?-A scattering...

• Aim to improve our understanding of low-energy
  n-A interactions.
• Three scattering regimes

Deep-Inelastic higher-multiplicity inelastic
states
Quasi-elastic
Resonance
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...to better understand oscillation experiments.

• New oscillation experiments (MINOS, Minboone,
  Nova) are making high precision measurements of
  oscillation parameters (mixing angles, mass
  splittings).
• With greater statistics, we must now worry about
  systematic uncertainties which were previously
  ignored.

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Example K2K oscillation signal

• Water Cerenkov experiment relied on kinematic
  reconstruction of E? for quasi-elastic events
  according to

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20 systematic error

• Background to QE events comes from resonance
  produced events with missing p.

• QE cross sections known to 10.

• Non-QE cross sections known to 20.

20 systematic error due to poorly understood
nuclear physics.
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Numi Beamline

• Numi beamline produces neutrinos from protons in
  main injector for the Minos oscillation
  experiment.
• MINOS will run mostly with LE beam, producing
  dominant ? energy of 3.5 GeV.

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Detector Overview
5 tons of fine-grained scintillator wrapped in
calorimeters.
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Engineers Drawing
Veto Wall
? planar modules
Scintillator Core
Individual modules hang on I-beams
Outer Calorimeters
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Scintillator

• Each planar module contains layers of
  triangular scintillator extrusions containing
  embedded optical fibers.

• 3 strip orientations

• Resolution (2 track events)
• 1mm (x,y,z vertex resolution)
• .4O (qm)

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Location
MINOS
Miner?a
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Rates
Fiducial volumes 3 ton scintillator, 1 ton Fe,
1 ton Pb.
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Quasi-Elastic Scattering

• Known at best to 10, but worse at lower En..
• Minerna predicted rates
• 103K/ton for CC
• 42K/ton for NC
• Estimate 750K events for 5 ton (fiducial)
  detector
• Will increase precision of cross section by
  factor of 4!
• Will also measure FA, ds/dQ2.

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Resonance Production

• Current uncertainties on cross section are 40.
• Minerna will record 1 million CC resonance
  events.
• Plan to measure s(En), ds/dQ2 for individual
  channels with 5 uncertainties.
• Will compare to electroproduction data and study
  nuclear effects.

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Other topics...

• DIS structure functions
• Coherent pion production
• Nuclear effects
• Duality studies
• Strangeness production

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Timeline
Data taking beings
May Experiment funded through Fermilab.
2007
2004
2006
2005
April Stage 1 approval
Installation and Commissioning
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Summary

• Minerna provide precision measurement of n
  scattering on nuclear targets across a number of
  regimes.
• Resulting measurements will constrain simulations
  required by the next generation of oscillation
  experiments, helping to control systematic errors.

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Extra Slides
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Collaboration Members Come from Nuclear Physics
and HEP
Nuclear Physics High Energy