New Rock Map Work

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New Rock Map Work

• Alec Habig
• NONAP working group meeting
• MINOS Collaboration Meeting, Athens
• Friday, April 13, 2007

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Current Rock Map

• Sue Kasahara in her thesis used
• USGS Digital Elevation Maps
• Trig
• standard rock
• gets column depth of rock as a function of (q,f)
  for Soudan II
• Updated to MINOS location by Brian Rebel
• Used in charge ratio paper to get Intensity(q,f)
  to first order
• Intensity then fit to Crouch curve per dW bin to
  extract surface energy of CRs in that bin
• Turns uncertainty in rock into uncertainty in Em
  cosq (per bin)
• Same for m and m- in that bin, so all is OK

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DUSEL Geology

• Much geological surveying has been done for the
  DUSEL/Soudan proposal
• Primarily by Dean Peterson of UMDs Precambrian
  Research Center
• See http//soudan.umn.edu/ius for some really
  good stuff
• We now have very detailed surface topology, and
  3D maps of the geological features underground
• Including density/composition

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An Old Iron Mine
Hematite Ores Mine Workings
Soudan Lab
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Parent Iron Formation
Iron formation
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Column Depths
Iron formation
Rays from MINOS every 5o (can dial in resolution)
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Even Larger Geology
Soudan Fault Iron Formation Greenstone Granito
id Gabbro Felsic Tuff
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Surface
Detailed Topo Of Soudan 3D Model
These rays cut by regional DEM
Rays from MINOS every 5 degrees
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Plans

• Dean Peterson is kindly making available his 3D
  geology maps and models
• Formatted in GOCAD
• Steve Farrell (UMD undergrad) is working to
  convert them to MINOS-centered rays
• Line segments have density, length
• Integrate up each column in total g/cm2, put in
  (q,f) lookup table class for use in minossoft
• Will crosscheck with muon intensity
• Especially in the ore body, much of which has
  been mined, and we dont know the status of
  whats gone, whats been backfilled, whats still
  open air

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Uses?

• Does not change current muon charge paper
• Could be used to reduce systematic errors in Em
  cosq
• Enough knowledge to tease out the differential
  dE/dx of m, m-?
• Dunno.
• Does it have a way high nifty factor?
• You betcha!