Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF{sub 3}I Bubble Chamber

Journal Article · Fri Jan 14 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.021303· OSTI ID:21532236

Behnke, E; Behnke, J; Hinnefeld, J H; Levine, I; Shepherd, T ^[1]; Brice, S J; Broemmelsiek, D; Cooper, P S; Crisler, M; Hall, J; Hu, M; Ramberg, E; Sonnenschein, A ^[2]; Collar, J I; Dahl, C E; Fustin, D; Szydagis, M ^[3]

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1. Indiana University South Bend, South Bend, Indiana (United States)
2. Fermi National Accelerator Laboratory, Batavia, Illinois (United States)
3. Enrico Fermi Institute, KICP and Department of Physics, University of Chicago, Chicago, Illinois (United States)

Data from the operation of a bubble chamber filled with 3.5 kg of CF{sub 3}I in a shallow underground site are reported. An analysis of ultrasound signals accompanying bubble nucleations confirms that alpha decays generate a significantly louder acoustic emission than single nuclear recoils, leading to an efficient background discrimination. Three dark matter candidate events were observed during an effective exposure of 28.1 kg day, consistent with a neutron background. This observation provides strong direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering for WIMP masses >20 GeV/c{sup 2}.

• OSTI ID: 21532236
• Journal Information: Physical Review Letters, Vol. 106, Issue 2; Other Information: DOI: 10.1103/PhysRevLett.106.021303; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALPHA DECAY
BUBBLE CHAMBERS
BUBBLES
CARBON FLUORIDES
DETECTION
GEV RANGE
IODINE COMPOUNDS
NEUTRONS
NONLUMINOUS MATTER
NUCLEATION
PARTICLE INTERACTIONS
PROTONS
RECOILS
SCATTERING
SPIN
ANGULAR MOMENTUM
BARYONS
CARBON COMPOUNDS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FLUORIDES
FLUORINE COMPOUNDS
GAS TRACK DETECTORS
HADRONS
HALIDES
HALOGEN COMPOUNDS
INTERACTIONS
MATTER
MEASURING INSTRUMENTS
NUCLEAR DECAY
NUCLEONS
PARTICLE PROPERTIES
RADIATION DETECTORS