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Title: Improved dark matter search results from PICO-2L Run 2

Abstract

New data are reported from a second run of the 2-liter PICO-2L C 3F 8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c 2.

Authors:
 [1]
  1. et al.
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
PICO Collaboration
OSTI Identifier:
1244485
Alternate Identifier(s):
OSTI ID: 1242848
Report Number(s):
FERMILAB-PUB-16-028-AE-E-PPD; arXiv:1601.03729
Journal ID: ISSN 2470-0010; PRVDAQ; 1415256
Grant/Contract Number:  
AC02-07CH11359; SC-0012161
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 93; Journal Issue: 6; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Amole, C. Improved dark matter search results from PICO-2L Run 2. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.93.061101.
Amole, C. Improved dark matter search results from PICO-2L Run 2. United States. doi:10.1103/PhysRevD.93.061101.
Amole, C. Tue . "Improved dark matter search results from PICO-2L Run 2". United States. doi:10.1103/PhysRevD.93.061101. https://www.osti.gov/servlets/purl/1244485.
@article{osti_1244485,
title = {Improved dark matter search results from PICO-2L Run 2},
author = {Amole, C.},
abstractNote = {New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c2.},
doi = {10.1103/PhysRevD.93.061101},
journal = {Physical Review D},
number = 6,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

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    Works referencing / citing this record:

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