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Title: A buffer-free concept bubble chamber for PICO dark matter searches

Abstract

In this paper, we report on the successful operation at Drexel University of the PICO collaboration's first C$$_3$$F$$_8$$ buffer-free prototype fluorocarbon bubble chamber. Previous PICO bubble chambers have produced world-leading WIMP search results with fluorocarbon target fluids, separated from the steel bellows by a buffer layer of water. Surface tension effects at the jar walls and liquid-liquid interface lead to a class of background events which have nuclear-recoil-like acoustic signatures and thus contaminate the WIMP-like signal region in analysis. Thus new bubble chambers are to be constructed "right-side-up", meaning that the jar of C$$_3$$F$$_8$$ is above the bellows with no water inside the inner vessel. The Drexel Bubble Chamber (DBC), runs successfully at and below the nuclear recoil thresholds used by PICO for WIMP searches, including thresholds as low as 1.19 keV. We have demonstrated sensitivity to $$^{137}$$Cs gammas and spontaneous fission neutrons from $$^{244}$$Cm, and acoustic alpha discrimination is demonstrated to be possible although the observed rate of alpha decays is very low. Position reconstruction from stereoscopic imaging allows for basic analysis cuts for calibration data. The successful construction and operation of this prototype confirm the effectiveness of the right-side-up design, which will be used in future dark matter searches such as PICO-40L and PICO-500.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3]
  1. Pennsylvania U.
  2. Fermilab
  3. Northwestern U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1556983
Report Number(s):
arXiv:1905.07367; FERMILAB-PUB-19-396-AE
1735411
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Bressler, M., Campion, P., Cushman, V. S., Morrese, A., Wagner, J. M., Zerbo, S., Neilson, R., Crisler, M., and Dahl, C. E. A buffer-free concept bubble chamber for PICO dark matter searches. United States: N. p., 2019. Web.
Bressler, M., Campion, P., Cushman, V. S., Morrese, A., Wagner, J. M., Zerbo, S., Neilson, R., Crisler, M., & Dahl, C. E. A buffer-free concept bubble chamber for PICO dark matter searches. United States.
Bressler, M., Campion, P., Cushman, V. S., Morrese, A., Wagner, J. M., Zerbo, S., Neilson, R., Crisler, M., and Dahl, C. E. Fri . "A buffer-free concept bubble chamber for PICO dark matter searches". United States. https://www.osti.gov/servlets/purl/1556983.
@article{osti_1556983,
title = {A buffer-free concept bubble chamber for PICO dark matter searches},
author = {Bressler, M. and Campion, P. and Cushman, V. S. and Morrese, A. and Wagner, J. M. and Zerbo, S. and Neilson, R. and Crisler, M. and Dahl, C. E.},
abstractNote = {In this paper, we report on the successful operation at Drexel University of the PICO collaboration's first C$_3$F$_8$ buffer-free prototype fluorocarbon bubble chamber. Previous PICO bubble chambers have produced world-leading WIMP search results with fluorocarbon target fluids, separated from the steel bellows by a buffer layer of water. Surface tension effects at the jar walls and liquid-liquid interface lead to a class of background events which have nuclear-recoil-like acoustic signatures and thus contaminate the WIMP-like signal region in analysis. Thus new bubble chambers are to be constructed "right-side-up", meaning that the jar of C$_3$F$_8$ is above the bellows with no water inside the inner vessel. The Drexel Bubble Chamber (DBC), runs successfully at and below the nuclear recoil thresholds used by PICO for WIMP searches, including thresholds as low as 1.19 keV. We have demonstrated sensitivity to $^{137}$Cs gammas and spontaneous fission neutrons from $^{244}$Cm, and acoustic alpha discrimination is demonstrated to be possible although the observed rate of alpha decays is very low. Position reconstruction from stereoscopic imaging allows for basic analysis cuts for calibration data. The successful construction and operation of this prototype confirm the effectiveness of the right-side-up design, which will be used in future dark matter searches such as PICO-40L and PICO-500.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {5}
}