Neutrino Factory and INO

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Neutrino Factory and INO

• Debasish Majumdar
• Saha Institute of Nuclear Physics
• Kolkata, INDIA

NuGoa09, Internatinal Centre, Goa
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Neutrinos from Neutrino Factory

• Protons are made to impinge on a target
• Pions are produced
• Pions decay to muons
• Muons decay to produce neutrinos
• 
  -
• ?- ? ?- ? ?? ?e e-
• ? Muon decay length (?ct) 126 km (Eµ 20 GeV)
• (Too long)
• ? Use muon storage ring instead
• ? Typical design ? Two straight sections
  connected by two arcs
• ? A straight section points towards desired
  neutrino physics experiment

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Beyond Superbeam - Neutrino Factory
7000 KM
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Iron Calorimeter (ICAL) Detector atIndia-based
Neutrino Observatory

• Modular structure
• Stacks of 6cm thick iron layers (140 layers in
  total) interleaved with 2.5cm gaps to accommodate
  RPC detectors
• Dimension of each module
• 16 m X 16 m X 12 m
• Mass of the ICAL detector 50 kTon
• (can be achieved by placing 3 modules along
  x-direction)
• Dimension ? 48 m X 16 m X 12 m

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INO Detector Concept
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Magic Baseline
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Issues Addressed Using Neutrino Oscillation(with
INO as the end detector)

• Wrong sign muons
• Reach of sin22?13
• Simulation of Neutrino factory neutrinos at INO
  (preliminary)
• Baseline lengths are under study
• Rutherford-INO Baseline (7612 km)

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Reach of sin22?13

• Defined as the value of ?13 and hence sin22?13
  for which wrong sign muon signal yield is just
  above the statistical error.
• Different Boost gives different reach for
  sin22?13
• The variation of E? with sin22?13 reach is
  obtained.
• Such variation for inverted mass hierarchy and
  other CP-violation value
• are being calculated.

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SIMULATIONS WITH ICAL
DETECTOR
a) NUANCE event generator
Given the detector specifications and neutrino
flux from Neutrino factory it generates
neutrino events at ICAL (product particles and
their production vertex at ICAL)
b) GEANT 3.2 Simulation Code
The outputs of NUANCE are the inputs to GEANT
GEANT propagates the product particles through
ICAL and Gives as outputs, their hit points,
momenta, time information etc.
c) Analyse the GEANT output
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GENERATING OSCILLATED EVENTS USING NUANCE
Output details Event no., particle id, x, y,
z, px, py, pz
Oscillation probability P(?????)
Case I Oscillation incorporated inside NUANCE
itself
Case II From NUANCE output , prob. of each event
is calculated using the
oscillation formula
Now after each event call a random number.
If prob.gt Random number, then that event
survives. If prob.lt Random number,
then that event is ignored
Resulting Output is Oscillated Nuance Data
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50 kTon x 1 year
Nuance Data Only No. of events 187858 (no
osc) 127677(with osc)
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Nuance Data Only
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Summary

• Some physics studies have been made for possible
  neutrino beams from a possible Neutrino Factory
  at UK with ICAL at INO as the End-detector.
• The baseline length of 7613 Km is considered
  (Rutherford lab ? INO)
• sin22?13 reach 0.00002 (?13 lt 0.5o ) at INO is
  obtained for E? 75 GeV.
• The effect of CP-violation and of mass hierarchy
  on sin22?13 reach are also to be studied.

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Collaborators

• Sudeb Bhattacharya
• Kamales Kar
• Ambar Ghosal
• Saha Institute of Nuclear Physics, Kolkata, India