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

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

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

6. 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

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

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

9. Building – Ready end of May, 2005

10. New Experiments Dark 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 …

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

12. 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, 2005 Finalize Infrastructure Needs & Establish Scientific Road-Map

13.  92% SSM Flux in Low-Energy pp-Neutrinos   1% Test of SSM & Precision in  12  Poor Precision Presently for 7Be  Possibility 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 are Surprises lurking?

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

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

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

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