Improved Limits on Spin-Dependent WIMP-Proton Interactions from a Two Liter CF3I Bubble Chamber

Thumbnail Image
Can’t use the file because of accessibility barriers? Contact us with the title of the item, permanent link, and specifics of your accommodation need.

Date

2011-03

Journal Title

Journal ISSN

Volume Title

Publisher

American Physical Society

Abstract

Data from the operation of a bubble chamber filled with 3.5 kg of CF3I 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 WIMP-proton spin-dependent scattering for WIMP masses > 20 GeV/c2.

Description

Keywords

Citation

Journal

DOI

Link(s) to data and video for this item

Relation

Rights

Type

Article