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dm_task_force:dec19-11

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===== Agenda for the December 19, 2011 DM Depth Task Force =EVO meeting at 3 pm central time Look under Universe for DM Task Force, with password “depth” or connect by phone at 1 626 395 2112 with ID = 446 1036# and Pwd 8461#

Back to Depth Task Force wiki startpage

Converging on the same physics list

  • Presentation by Anthony.
  • Discussion.

Getting on the same page

  • New MC at Homestake with G4 4.9.5 + Mu-nuc + MUSUN muons (parameterized muon spectrum) - Chao
  • Input files (Angie) and first comparison with Homestake parameterization (Chao)
  • Comparing Livetimes & benchmark numbers: Fill in the TABLE below BEFORE the meeting so we can discuss. We will start with quick presentation of what you did, in order to interpret the numbers. If you want to include a few slides with pictures or explanations, you can plug them into these first four bullet points.
  1. LZ geometry with G4 4.9.3 P02 (good mu-nuc + shielding list) - Angie
  2. LZ geometry with isotropic M&H thrown - Monica
  3. LZ geometry at Brown with Angie's files - David, Monica
  4. LZ geometry at Homestake with parametrization Chao's Presentation

We will refer to these “methods” by the following numbers and letters. Numbers refer to particle files, letters to parametrizations.

  • 1. “Groom” Parametrization of muons at Homestake depth, propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries. Assumes a flat overburden, but has a good angular distribution of incoming neutrons. Uses “Soudan” rock.
  • 2. Muons generated via MUSUN, taking account of the geography and geology of the Homestake site. Muons then propagated through rock using GEANT4 v4.9.5 to produce neutrons and all secondaries. Not yet generated by Chao.
  • 3. Muons generated via MUSUN, taking account of the geography and geology of the Soudan site. Muons then propagated through rock using GEANT4 v4.9.3 P02 with new mu-nuclear to produce neutrons and all secondaries. Done by Angie, not yet filtered for Melinda
  • A. The LZ Monte Carlo (4850 level) with isotropic angular distribution on a sphere
  • B. The Neutron Multiplicity Meter (2100 mwe) with cosnθ distribution (partly derived from existing flux measurements)
  • C. Muons generated via MUSUN, taking account of the geography and geology of the Homestake site. Neutron parametrization created from this. Done by Chao.

TABLE

Fill these out by referring to the method. Fill out numbers and put links to spectra. Templates are included for the first few entries. Please replace with the correct numbers.

Muons per sec per sq meter hitting the top of the water tank (downward) + spectrum if available
  • 2.45 E-2 (File 1 on LZ geometry - Angie) Generated muon events are scaled to measured muon flux on CDMS veto panels. KE Spectrum
  • 4.22 E-3 (Method A - Monica) Deduced by comparing neutrons thrown to M&H neutron flux at 4850, scaled by muon:neutron ratio.
  • 3.14 E-2 (Method C - Chao) Deduced by …
Muons per sec per sq meter hitting all outer walls of the tank (from out to in)
  • 1.05 E-2 (File 1 on LZ geometry - Angie) Generated muon events are scaled to measured muon flux on CDMS veto panels
  • 1.22 E-3 (Method A - Monica) Deduced by comparing neutrons thrown to M&H neutron flux at 4850, scaled by muon:neutron ratio
  • 2.14 E-2 (Method C - Chao) Deduced by …
Neutrons (with KE > 100 KeV) per sec per sq meter hitting the top of the water tank (downward) + spectrum (all energies)
  • 1.9 E -6 (File 1 on LZ geometry - Angie) spectrum
Neutrons (with KE > 100 KeV) per sec per sq meter hitting all outer walls of the tank (from out to in) +spectrum (all energies)
  • 2.4 E -6 (File 1 on LZ geometry - Angie) spectrum
Neutrons (with KE > 100 KeV) per sec per sq meter entering detector volume + spectrum
  • 5.9 E -7 (File 1 on LZ geometry - Angie) spectrum
Events per sec that have at least one NR
  • 4.9 E -5 (File 1 on LZ geometry - Angie)
Rate of single NR (without including info from any possible veto)
  • 5.9 E -7 (File 1 on LZ geometry - Angie)
Rate of Single WIMP candidates (ignore veto)
Veto ratio (vetoed : unvetoed) for single NR (add your veto "rules")
Veto ratio for multiple NR.

Soudan Benchmarking

  • Status of filtered files - Melinda, Angie
  • Livetime numbers

Refine benchmark plots and numbers

Schedule Next meeting

dm_task_force/dec19-11.1324321510.txt.gz · Last modified: 2011/12/19 13:05 (external edit)

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