@article{barbeau_belov_bernardi_bock_bolozdynya_bouabid_browning_cabrera-palmer_conley_silva_et al._2024, title={Accessing new physics with an undoped, cryogenic CsI CEvNS detector for COHERENT at the SNS}, volume={109}, ISSN={["2470-0029"]}, DOI={10.1103/PhysRevD.109.092005}, abstractNote={We consider the potential for a 10 kg undoped cryogenic CsI detector operating at the Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity to discover new physics beyond the standard model (BSM). Through a combination of increased event rate, lower threshold, and good timing resolution, such a detector would significantly improve on past measurements. We considered tests of several BSM scenarios such as neutrino nonstandard interactions and accelerator-produced dark matter. This detector’s performance was also studied for relevant questions in nuclear physics and neutrino astronomy, namely the weak charge distribution of Cs and I nuclei and detection of neutrinos from a core-collapse supernova. Published by the American Physical Society 2024}, number={9}, journal={PHYSICAL REVIEW D}, author={Barbeau, P. S. and Belov, V. and Bernardi, I. and Bock, C. and Bolozdynya, A. and Bouabid, R. and Browning, J. and Cabrera-Palmer, B. and Conley, E. and Silva, V. and et al.}, year={2024}, month={May} }
 @article{akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_bolozdynya_et al._2023, title={First Probe of Sub-GeV Dark Matter beyond the Cosmological Expectation with the COHERENT CsI Detector at the SNS}, volume={130}, ISSN={["1079-7114"]}, DOI={10.1103/PhysRevLett.130.051803}, abstractNote={The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220  MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9  keV_{nr}. No evidence for dark matter is found and we thus place limits on allowed parameter space. With this low-threshold detector, we are sensitive to coherent elastic scattering between dark matter and nuclei. The cross section for this process is orders of magnitude higher than for other processes historically used for accelerator-based direct-detection searches so that our small, 14.6 kg detector significantly improves on past constraints. At peak sensitivity, we reject the flux consistent with the cosmologically observed dark-matter concentration for all coupling constants α_{D}<0.64, assuming a scalar dark-matter particle. We also calculate the sensitivity of future COHERENT detectors to dark-matter signals which will ambitiously test multiple dark-matter spin scenarios.}, number={5}, journal={PHYSICAL REVIEW LETTERS}, author={Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V. and Bernardi, I. and Blackston, M. A. and Bock, C. and Bolozdynya, A. and et al.}, year={2023}, month={Feb} }
 @article{an_awe_barbeau_becker_belov_bernardi_bock_bolozdynya_bouabid_brown_et al._2023, title={Measurement of Electron-Neutrino Charged-Current Cross Sections on <SUP>127</SUP>I with the COHERENT NaIνE Detector}, volume={131}, ISSN={["1079-7114"]}, DOI={10.1103/PhysRevLett.131.221801}, abstractNote={Using an 185-kg NaI[Tl] array, COHERENT has measured the inclusive electron-neutrino charged-current cross section on ^{127}I with pion decay-at-rest neutrinos produced by the Spallation Neutron Source at Oak Ridge National Laboratory. Iodine is one the heaviest targets for which low-energy (≤50  MeV) inelastic neutrino-nucleus processes have been measured, and this is the first measurement of its inclusive cross section. After a five-year detector exposure, COHERENT reports a flux-averaged cross section for electron neutrinos of 9.2_{-1.8}^{+2.1}×10^{-40}  cm^{2}. This corresponds to a value that is ∼41% lower than predicted using the MARLEY event generator with a measured Gamow-Teller strength distribution. In addition, the observed visible spectrum from charged-current scattering on ^{127}I has been measured between 10 and 55 MeV, and the exclusive zero-neutron and one-or-more-neutron emission cross sections are measured to be 5.2_{-3.1}^{+3.4}×10^{-40} and 2.2_{-0.5}^{+0.4}×10^{-40}  cm^{2}, respectively.}, number={22}, journal={PHYSICAL REVIEW LETTERS}, author={An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V. and Bernardi, I. and Bock, C. and Bolozdynya, A. and Bouabid, R. and Brown, A. and et al.}, year={2023}, month={Dec} }
 @article{akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_bolozdynya_et al._2022, title={COHERENT constraint on leptophobic dark matter using CsI data}, volume={106}, ISSN={["2470-0029"]}, DOI={10.1103/PhysRevD.106.052004}, abstractNote={We use data from the COHERENT CsI[Na] scintillation detector to constrain sub-GeV leptophobic dark matter models. This detector was built to observe low-energy nuclear recoils from coherent elastic neutrino-nucleus scattering. These capabilities enable searches for dark matter particles produced at the Spallation Neutron Source mediated by a vector portal particle with masses between 2 and 400 MeV/c 2 . No evidence for dark matter is observed and a limit on the mediator coupling to quarks is placed. This constraint improves upon previous results by two orders of magnitude. This newly explored parameter space probes the region where the dark matter relic abundance is explained by leptophobic dark matter when the mediator mass is roughly twice the dark matter mass. COHERENT sets the best constraint on leptophobic dark matter at these masses.}, number={5}, journal={PHYSICAL REVIEW D}, author={Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V. and Bernardi, I. and Blackston, M. A. and Bock, C. and Bolozdynya, A. and et al.}, year={2022}, month={Sep} }
 @article{coherent collaboration_akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_et al._2022, title={Measurement of scintillation response of CsI[Na] to low-energy nuclear recoils by COHERENT}, volume={17}, ISSN={["1748-0221"]}, DOI={10.1088/1748-0221/17/10/P10034}, abstractNote={Abstract
               We present results of several measurements of CsI[Na]
  scintillation response to 3–60 keV energy nuclear recoils
  performed by the COHERENT collaboration using tagged neutron elastic
  scattering experiments and an endpoint technique. Earlier results,
  used to estimate the coherent elastic neutrino-nucleus scattering
  (CEvNS) event rate for the first observation of this process
  achieved by COHERENT at the Spallation Neutron Source (SNS), have
  been reassessed. We discuss corrections for the identified
  systematic effects and update the respective uncertainty values. The
  impact of updated results on future precision tests of CEvNS is
  estimated. We scrutinize potential systematic effects that could
  affect each measurement. In particular we confirm the response of
  the H11934-200 Hamamatsu photomultiplier tube (PMT) used for the
  measurements presented in this study to be linear in the relevant
  signal scale region.}, number={10}, journal={JOURNAL OF INSTRUMENTATION}, author={COHERENT Collaboration, C. O. H. E. R. E. N. T. Collaboration and Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V. and Bernardi, I. and Blackston, M. A. and Bock, C. and et al.}, year={2022}, month={Oct} }
 @article{akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_bolozdynya_et al._2022, title={Measurement of the Coherent Elastic Neutrino-Nucleus Scattering Cross Section on CsI by COHERENT}, volume={129}, ISSN={["1079-7114"]}, DOI={10.1103/PhysRevLett.129.081801}, abstractNote={We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in a high flux of neutrinos produced at the Spallation Neutron Source at Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled the dataset since the first observation of CEvNS, achieved with this detector. Systematic uncertainties have also been reduced with an updated quenching model, allowing for improved precision. With these analysis improvements, the COHERENT Collaboration determined the cross section to be (165_{-25}^{+30})×10^{-40}  cm^{2}, consistent with the standard model, giving the most precise measurement of CEvNS yet. The timing structure of the neutrino beam has been exploited to compare the CEvNS cross section from scattering of different neutrino flavors. This result places leading constraints on neutrino nonstandard interactions while testing lepton flavor universality and measures the weak mixing angle as sin^{2}θ_{W}=0.220_{-0.026}^{+0.028} at Q^{2}≈(50  MeV)^{2}.}, number={8}, journal={PHYSICAL REVIEW LETTERS}, author={Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V. and Bernardi, I. and Blackston, M. A. and Bock, C. and Bolozdynya, A. and et al.}, year={2022}, month={Aug} }
 @article{akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_bolozdynya_et al._2022, title={Monitoring the SNS basement neutron background with the MARS detector}, volume={17}, ISSN={["1748-0221"]}, DOI={10.1088/1748-0221/17/03/P03021}, abstractNote={Abstract
               We present the analysis and results of the first dataset
collected with the MARS neutron detector
deployed at the Oak Ridge National
Laboratory Spallation Neutron Source (SNS) for the purpose of
monitoring and characterizing the beam-related neutron (BRN) background
for the COHERENT collaboration. MARS was positioned
next to the COH-CsI coherent elastic neutrino-nucleus scattering detector
in the SNS basement corridor. This is the basement location of
closest proximity to the SNS target and thus, of highest neutrino flux,
but it is also well shielded from the BRN flux by infill concrete
and gravel. These data show the detector registered roughly one BRN per day.
Using MARS' measured detection efficiency, the incoming
BRN flux is estimated to be 1.20 ± 0.56 neutrons/m^2/MWh
for neutron energies above ∼3.5 MeV and up to a few tens of MeV.
We compare our results with previous BRN measurements in the SNS basement corridor
reported by other neutron detectors.}, number={3}, journal={JOURNAL OF INSTRUMENTATION}, author={Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V and Bernardi, I and Blackston, M. A. and Bock, C. and Bolozdynya, A. and et al.}, year={2022}, month={Mar} }
 @article{akimov_an_awe_barbeau_becker_belov_bernardi_blackston_bock_bolozdynya_et al._2022, title={Simulating the neutrino flux from the Spallation Neutron Source for the COHERENT experiment}, volume={106}, ISSN={["2470-0029"]}, DOI={10.1103/PhysRevD.106.032003}, abstractNote={The Spallation Neutron Source (SNS) at Ridge National Laboratory is a pulsed source of neutrons and, as a byproduct of this operation, an intense source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investigate coherent elastic neutrino-nucleus scattering and other physics with a suite of detectors. This work includes a description of our Geant4 simulation of neutrino production at the SNS and the flux calculation which informs the COHERENT studies. We estimate the uncertainty of this calculation at ∼ 10% based on validation against available low-energy π + production data.}, number={3}, journal={PHYSICAL REVIEW D}, author={Akimov, D. and An, P. and Awe, C. and Barbeau, P. S. and Becker, B. and Belov, V and Bernardi, I and Blackston, M. A. and Bock, C. and Bolozdynya, A. and et al.}, year={2022}, month={Aug} }