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!