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Andrew Hime Physics Division, Los Alamos National Laboratory

Andrew Hime Physics Division, Los Alamos National Laboratory Workshop on Low-Radioactivity Techniques Laurentian University, Sudbury, Ontario, Canada December 12-14, 2004. Relative Attenuation of Muons & Muon-Induced Activity. Muon Flux Muon-Induced Neutrons Muon-Induced Cosmogenics.

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Andrew Hime Physics Division, Los Alamos National Laboratory

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  1. Andrew Hime Physics Division, Los Alamos National Laboratory Workshop on Low-Radioactivity Techniques Laurentian University, Sudbury, Ontario, Canada December 12-14, 2004

  2. Relative Attenuation of Muons & Muon-Induced Activity Muon Flux Muon-Induced Neutrons Muon-Induced Cosmogenics SNOLAB Dongming Mei & AH, preliminary

  3. SNO Flavor Content of the 8B Solar Neutrino Flux High-purity water & detector construction materials … NC background equivalent to ~ 0.4 neutrons / tonne / year.

  4. 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

  5. Rectangular Hall 60ft L x 50ft W x 50ft H Cryo-Pit 65ft H x 50ft OD Underground Laboratory Conceptual Layout White Paper Description in Progress SNO Cavern 110ft H x 75ft OD Ladder-Labs 15ft W x 10ft H 20ft W x 10ft H  Excavation has begun under contract with Redpath  First new space in about 1 year  Laboratory complete in 2007

  6. Provide support for underground program • Clean assembly, • lab space • meeting rooms, • Computing facilities • Office space

  7. Building – Ready end of May, 2005

  8. 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 …

  9. Experiment Evaluation Committee • Chair – B. Barish • Secretary - A. Hime • Members • B. Balantenkin • C. Burgess • T. Kajita • J. Martin • K. Ragan • K. Scholberg • D. Wark

  10. Workshops 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, 2005 Finalize Infrastructure Needs & Establish Scientific Road-Map

  11.  92% SSM Flux in Low-Energy pp-Neutrinos • Poor Precision Presently for 7Be • Possibility to Observe pep Neutrinos in SNO with Liquid Scintillator • Vacuum/Matter Transition Uniquely Predicted for LMA Solar Neutrino Oscillations … Does the whole picture fit together or are Surprises lurking? Vacuum Matter   1% Test of SSM & Precision in 12

  12. Dark Matter Results & Dreams } Where we Are X > 1000 } Our Dreams Mark Boulay & AH, astro-ph/04113588

  13. Dark Matter Sensitivity versus Depth Dongming Mei & AH, preliminary

  14. bb Sensitivity versus Depth Degenerate Inverted Internal BGND Total Muon BGND Muons Muon-Induced Neutrons Normal Dongming Mei & AH, preliminary

  15. Get Clean & Go Deep … Have a great workshop!

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