21 research outputs found
Data-driven modeling of electron recoil nucleation in PICO C3F8 bubble chambers
[EN] The primary advantage of moderately superheated bubble chamber detectors is their simultaneous sensitivity to nuclear recoils from weakly interacting massive particle (WIMP) dark matter and insensitivity to electron recoil backgrounds. A comprehensive analysis of PICO gamma calibration data demonstrates for the first time that electron recoils in C3F8 scale in accordance with a new nucleation mechanism, rather than one driven by a hot spike as previously supposed. Using this semiempirical model, bubble chamber nucleation thresholds may be tuned to be sensitive to lower energy nuclear recoils while maintaining excellent electron recoil rejection. The PICO-40L detector will exploit this model to achieve thermodynamic thresholds as low as 2.8 keV while being dominated by single-scatter events from coherent elastic neutrino-nucleus scattering of solar neutrinos. In one year of operation, PICO-401, can improve existing leading limits from PICO on spin-dependent WIMP-proton coupling by nearly an order of magnitude for WIMP masses greater than 3 GeV c(-2) and will have the ability to surpass all existing non-xenon bounds on spin-independent WIMP-nucleon coupling for WIMP masses from 3 to 40 GeV c(-2).The PICO Collaboration wishes to thank SNOLAB and
its staff for support through underground space, logistical
and technical services. SNOLAB operations are supported
by the Canada Foundation for Innovation and the Province
of Ontario Ministry of Research and Innovation, with
underground access provided by Vale at the Creighton
mine site. We wish to acknowledge the support of the
Natural Sciences and Engineering Research Council of
Canada (NSERC) and the Canada Foundation for
Innovation (CFI) for funding. We acknowledge the support
from National Science Foundation (NSF) (Grants
No. 0919526, No. 1506337, No. 1242637, No. 1205987,
and No. 1806722). We acknowledge that this work is
supported by the U.S. Department of Energy (DOE) Office
of Science, Office of High Energy Physics (under Award
No. DE-SC-0012161), by DGAPA-UNAM (PAPIIT
No. IA100118) and Consejo Nacional de Ciencia y
TecnologÃa (CONACyT, M¿exico, Grants No. 252167 and
No. A1-S-8960), by the Department of Atomic Energy
(DAE), Government of India, under the Centre for AstroParticle Physics II project (CAPP-II) at the Saha
Institute of Nuclear Physics (SINP), European Regional
Development Fund¿Project ¿Engineering Applications of
Microworld Physics¿ (Project No. CZ.02.1.01/0.0/0.0/
16_019/0000766), and the Spanish Ministerio de Ciencia,
Innovación y Universidades (Red Consolider MultiDark,
Grant No. FPA2017-90566-REDC). This work is partially
supported by the Kavli Institute for Cosmological Physics at
the University of Chicago through NSF Grant No. 1125897,
and an endowment from the Kavli Foundation and its
founder Fred Kavli. We also wish to acknowledge the
support from Fermi National Accelerator Laboratory under
Contract No. DE-AC02-07CH11359, and Pacific Northwest
National Laboratory, which is operated by Battelle for the
U.S. Department of Energy under Contract No. DE-AC05-
76RL01830. We also thank Compute Canada [75] and the
Center for Advanced Computing, ACENET, Calcul Qu¿ebec,
Compute Ontario, and WestGrid for computational support.Amole, C.; Ardid RamÃrez, M.; Arnquist, I.; Asner, DM.; Baxter, D.; Behnke, E.; Bressler, M.... (2019). Data-driven modeling of electron recoil nucleation in PICO C3F8 bubble chambers. Physical Review D: covering particles, fields, gravitation, and cosmology. 100(8):1-18. https://doi.org/10.1103/PhysRevD.100.082006S1181008Amole, C., Ardid, M., Arnquist, I. J., Asner, D. M., Baxter, D., Behnke, E., … Chen, C. J. (2019). Dark matter search results from the complete exposure of the PICO-60
C3F8
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The Difference Between 'True Christian Enlightenment and Obscurantism': Antipapism in The Netherlands Between 1795 and 1830
Sincerely James: Reconsidering Frederick Francis’s Proposed Health Wish Formula
This article interacts with Frederick Francis’s well-known suggestion that Jas 5 contains a health wish formula. Based on more recent findings of epistolography, this article argues that the references to healing in Jas 5 contrast sharply with the first-century CE health wish formula(s). In addition to current research on Hellenistic epistolography, this article offers three further pieces of evidence which suggest that the letter of James does not conclude with a health wish formula, but rather with a promise of restoration from spiritual sickness