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Title: Direct Measurement of the Bubble Nucleation Energy Threshold in a CF3I Bubble Chamber

Here, we measured the energy threshold and efficiency for bubble nucleation from iodine recoils in a CF3I bubble chamber in the energy range of interest for a dark matter search. These interactions cannot be probed by standard neutron calibration methods, so we develop a new technique by observing the elastic scattering of 12 GeV/c negative pions. The pions are tracked with a silicon pixel telescope and the reconstructed scattering angle provides a measure of the nuclear recoil kinetic energy. The bubble chamber was operated with a nominal threshold of (13.6±0.6) keV. Interpretation of the results depends on the response to fluorine and carbon recoils, but in general we find agreement with the predictions of the classical bubble-nucleation theory. Moreover, this measurement confirms the applicability of CF3I as a target for spin-independent dark matter interactions and represents a novel technique for calibration of superheated fluid detectors.
Authors:
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [4] ;  [3] ;  [5] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [2] ;  [3] ;  [2] ;  [2] more »;  [6] ;  [2] ;  [2] « less
  1. Indiana Univ. South Bend, IN (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Univ. of Chicago, IL (United States)
  4. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Northwestern Univ., Evanston, IL (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. SNOLAB, Sudbury, ON (Canada)
Publication Date:
OSTI Identifier:
1091428
Report Number(s):
PNNL-SA--95446
Journal ID: ISSN 2470-0010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D; Journal Volume: 88; Journal Issue: 2
Publisher:
American Physical Society (APS)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS