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Andrew HimePhysics Division, Los Alamos National Laboratory
Workshop on Low-Radioactivity TechniquesLaurentian University, Sudbury, Ontario, Canada
December 12-14, 2004
Dongming Mei & AH, preliminary
Relative Attenuation of Muons & Muon-Induced Activity
SNOLAB
Muon Flux Muon-Induced Neutrons
Muon-Induced Cosmogenics
SNO
High-purity water & detector constructionmaterials … NC background equivalent to~ 0.4 neutrons / tonne / year.
Flavor Content of the 8BSolar Neutrino Flux
SNOLAB – An International Facility for Underground Science
Expand underground space to allow several experiments to operate simultaneously
Provide a surface building to support the underground experiments
Experiments selected on the basis of scientific merit
and technical feasibility
SNO Cavern110ft H x 75ft OD
RectangularHall
60ft L x 50ft W x 50ft H
Ladder-Labs15ft W x 10ft H20ft W x 10ft H
Cryo-Pit65ft H x 50ft OD
Underground LaboratoryConceptual Layout
White Paper Description in Progress
Excavation has begun under contract with Redpath
First new space in about 1 year
Laboratory complete in 2007
Provide support for underground program
Clean assembly,
lab space
meeting rooms,
Computing facilities
Office space
Building – Ready end of May, 2005
New ExperimentsDark Matter, Double Beta Decay, Low-Energy Solar Neutrinos
Letters of Interest can be submitted at any time!
15 LOI’s received & evaluated following
January 2004 call … 1 more received last week and another expected
early in New Year …
Initial Suite of Experiments under consideration
along with longer term Scientific Road-Map …
Experiment Evaluation Committee
Chair – B. Barish
Secretary - A. Hime
Members B. Balantenkin
C. Burgess
T. Kajita
J. Martin
K. Ragan
K. Scholberg
D. Wark
Workshops
I. August 20, 2002 (Sudbury)Science & Information Gathering
II. November 21-22, 2002 (Ottawa)Prospective Experiments & Infrastructure Needs
III. May 12-14, 2004 (Sudbury)Refine Infrastructure Needs & Kick-Off
Experiment Evaluation Process
IV. Planning for May, 2005Finalize Infrastructure Needs & Establish
Scientific Road-Map
92% SSM Flux in Low-Energy pp-Neutrinos
1% Test of SSM & Precision in 12 Poor Precision Presently for 7BePossibility to Observe pep Neutrinos in SNO with Liquid Scintillator
Vacuum
Matter
Vacuum/Matter Transition Uniquely Predicted for LMA Solar Neutrino Oscillations
… Does the whole picture fit together or areSurprises lurking?
Dark Matter Results & Dreams
Mark Boulay & AH, astro-ph/04113588
} Where we Are
} Our Dreams
X > 1000
Dongming Mei & AH, preliminary
Dark Matter Sensitivity versus Depth
Dongming Mei & AH, preliminary
Sensitivity versus Depth
Internal BGNDTotal Muon BGNDMuonsMuon-Induced Neutrons
Degenerate
Inverted
Normal
Get Clean & Go Deep
… Have a great workshop!