Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF$$_3$$I Bubble Chamber
Journal Article
·
OSTI ID:986631
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 the strongest direct detection constraint to date on WIMP-proton spin-dependent scattering for WIMP masses > 20 GeV/c{sup 2}.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 986631
- Report Number(s):
- FERMILAB-PUB-10-318-A-CD-E; arXiv eprint number arXiv:1008.3518; TRN: US1006397
- Country of Publication:
- United States
- Language:
- English
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