Browsing by Subject "hep-ex"

Now showing 1 - 8 of 8
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    Development of a $^{83\mathrm{m}}$Kr source for the calibration of the CENNS-10 Liquid Argon Detector
    (Journal of Instrumentation, 2020-10-21) Collaboration, COHERENT; Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Blokland, L; Bolozdynya, A; Cabrera-Palmer, B; Chen, N; Chernyak, D; Conley, E; Daughhetee, J; Coello, M del Valle; Detwiler, JA; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Fox, W; Galindo-Uribarri, A; Rosso, A Gallo; Green, MP; Hansen, KS; Heath, MR; Hedges, S; Hughes, M; Johnson, T; Khromov, A; Konovalov, A; Kozlova, E; Kumpan, A; Li, L; Librande, JT; Link, JM; Liu, J; Mann, K; Markoff, DM; McGoldrick, O; Mueller, PE; Newby, J; Parno, DS; Pentilla, S; Pershey, D; Radford, D; Rapp, R; Ray, H; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Rudik, D; Runge, J; Salvat, DJ; Scholberg, K; Shakirov, A; Simakov, G; Snow, WM; Sosnovtsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Thornton, RT; Tolstukhin, I; Vanderwerp, J; Varner, RL; Venkataraman, R; Virtue, CJ; Visser, G; Wiseman, C; Wongjirad, T; Yang, J; Yen, Y-R; Yoo, J; Yu, C-H; Zettlemoyer, J
    We report on the preparation of and calibration measurements with a $^{83\mathrm{m}}$Kr source for the CENNS-10 liquid argon detector. $^{83\mathrm{m}}$Kr atoms generated in the decay of a $^{83}$Rb source were introduced into the detector via injection into the Ar circulation loop. Scintillation light arising from the 9.4 keV and 32.1 keV conversion electrons in the decay of $^{83\mathrm{m}}$Kr in the detector volume were then observed. This calibration source allows the characterization of the low-energy response of the CENNS-10 detector and is applicable to other low-energy-threshold detectors. The energy resolution of the detector was measured to be 9$\%$ at the total $^{83\mathrm{m}}$Kr decay energy of 41.5 keV. We performed an analysis to separately calibrate the detector using the two conversion electrons at 9.4 keV and 32.1 keV
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    First Probe of Sub-GeV Dark Matter Beyond the Cosmological Expectation with the COHERENT CsI Detector at the SNS
    Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Bock, C; Bolozdynya, A; Browning, J; Cabrera-Palmer, B; Chernyak, D; Conley, E; Daughhetee, J; Detwiler, J; Ding, K; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Rosso, A Gallo; Galindo-Uribarri, A; Green, MP; Heath, MR; Hedges, S; Hoang, D; Hughes, M; Johnson, T; Khromov, A; Konovalov, A; Kozlova, E; Kumpan, A; Li, L; Link, JM; Liu, J; Mann, K; Markoff, DM; Mastroberti, J; Mueller, PE; Newby, J; Parno, DS; Penttila, SI; Pershey, D; Rapp, R; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Ross, J; Rudik, D; Runge, J; Salvat, DJ; Salyapongse, AM; Sander, J; Scholberg, K; Shakirov, A; Simakov, G; Sinev, G; Snow, WM; Sosnovstsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Tolstukhin, I; Ujah, E; Vanderwerp, J; Varner, RL; Virtue, CJ; Visser, G; Wongjirad, T; Yen, Y-R; Yoo, J; Yu, C-H; Zettlemoyer, J
    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$_\text{nr}$. 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 $\alpha_D<0.64$, 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.
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    Measurement of the Coherent Elastic Neutrino-Nucleus Scattering Cross Section on CsI by COHERENT
    Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Bock, C; Bolozdynya, A; Browning, J; Cabrera-Palmer, B; Chernyak, D; Conley, E; Daughhetee, J; Detwiler, J; Ding, K; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Rosso, A Gallo; Galindo-Uribarri, A; Green, MP; Heath, MR; Hedges, S; Hoang, D; Hughes, M; Johnson, T; Khromov, A; Konovalov, A; Kozlova, E; Kumpan, A; Li, L; Link, JM; Liu, J; Mann, K; Markoff, DM; Mastroberti, J; Mueller, PE; Newby, J; Parno, DS; Penttila, SI; Pershey, D; Rapp, R; Ray, H; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Ross, J; Rudik, D; Runge, J; Salvat, DJ; Salyapongse, AM; Scholberg, K; Shakirov, A; Simakov, G; Sinev, G; Snow, WM; Sosnovstsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Tolstukhin, I; Ujah, E; Vanderwerp, J; Varner, RL; Virtue, CJ; Visser, G; Wongjirad, T; Yen, Y-R; Yoo, J; Yu, C-H; Zettlemoyer, J
    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 (SNS) at Oak Ridge National Laboratory. New data collected before detector decommissioning has 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 $(165^{+30}_{-25})\times10^{-40}$~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 non-standard interactions while testing lepton flavor universality and measures the weak mixing angle as $\sin^2\theta_{W}=0.220^{+0.028}_{-0.026}$ at $Q^2\approx(50\text{ MeV})^2$
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    Monitoring the SNS basement neutron background with the MARS detector
    (JINST, 2021-12-05) Collaboration, COHERENT; Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Bock, C; Bolozdynya, A; Browning, J; Cabrera-Palmer, B; Chernyak, D; Conley, E; Daughhetee, J; Detwiler, J; Ding, K; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Rosso, A Gallo; Galindo-Uribarri, A; Green, MP; Heath, MR; Hedges, S; Hoang, D; Hughes, M; Johnson, BA; Johnson, T; Khromov, A; Konovalov, A; Kozlova, E; Kumpan, A; Li, L; Link, JM; Liu, J; Mann, K; Markoff, DM; Mastroberti, J; Mueller, PE; Newby, J; Parno, DS; Penttila, SI; Pershey, D; Rapp, R; Ray, H; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Ross, J; Rudik, D; Runge, J; Salvat, DJ; Salyapongse, AM; Scholberg, K; Shakirov, A; Simakov, G; Sinev, G; Snow, WM; Sosnovstsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Tolstukhin, I; Ujah, E; Vanderwerp, J; Varner, RL; Virtue, CJ; Visser, G; Wongjirad, T; Yen, Y-R; Yoo, J; Yu, C-H; Zettlemoyer, J
    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 $1.20~\pm~0.56~\text{neutrons}/\text{m}^2/\text{MWh}$ for neutron energies above $\sim3.5$ 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.
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    Quenching factor measurements of neon nuclei in neon gas
    Balogh, L; Beaufort, C; Brossard, A; Caron, J-F; Chapellier, M; Coquillat, J-M; Corcoran, EC; Crawford, S; Fard, A Dastgheibi; Deng, Y; Dering, K; Durnford, D; Garrah, C; Gerbier, G; Giomataris, I; Giroux, G; Gorel, P; Gros, M; Gros, P; Guillaudin, O; Hoppe, EW; Katsioulas, I; Kelly, F; Knights, P; Kwon, L; Langrock, S; Lautridou, P; Martin, RD; Manthos, I; Matthews, J; Mols, J-P; Muraz, J-F; Neep, T; Nikolopoulos, K; O'Brien, P; Piro, M-C; Samuleev, P; Santos, D; Savvidis, G; Savvidis, I; Fernandez, F Vazquez de Sola; Vidal, M; Ward, R; Zampaolo, M; An, P; Awe, C; Barbeau, P; Hedges, S; Li, L; Runge, J
    The NEWS-G collaboration uses Spherical Proportional Counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of the nuclear quenching factor in neon gas at \SI{2}{bar} using an SPC deployed in a neutron beam at the TUNL facility. The energy-dependence of the nuclear quenching factor is modelled using a simple power law: $\alpha$E$_{nr}^{\beta}$; we determine its parameters by simultaneously fitting the data collected with the detector over a range of energies. We measured the following parameters in Ne:CH$_{4}$ at \SI{2}{bar}: $\alpha$ = 0.2801 $\pm$ 0.0050 (fit) $\pm$ 0.0045 (sys) and $\beta$ = 0.0867 $\pm$ 0.020 (fit) $\pm$ 0.006(sys). Our measurements do not agree with expected values from SRIM or Lindhard theory. We demonstrated the feasibility of performing quenching factor measurements at sub-keV energies in gases using SPCs and a neutron beam.
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    Search for Majoron-emitting modes of $^{136}$Xe double beta decay with the complete EXO-200 dataset
    Kharusi, S Al; Anton, G; Badhrees, I; Barbeau, PS; Beck, D; Belov, V; Bhatta, T; Breidenbach, M; Brunner, T; Cao, GF; Cen, WR; Chambers, C; Cleveland, B; Coon, M; Craycraft, A; Daniels, T; Darroch, L; Daugherty, SJ; Davis, J; Delaquis, S; Mesrobian-Kabakian, A Der; DeVoe, R; Dilling, J; Dolgolenko, A; Dolinski, MJ; Echevers, J; Jr, W Fairbank; Fairbank, D; Farine, J; Feyzbakhsh, S; Fierlinger, P; Fudenberg, D; Gautam, P; Gornea, R; Gratta, G; Hall, C; Hansen, EV; Hoessl, J; Hufschmidt, P; Hughes, M; Iverson, A; Jamil, A; Jessiman, C; Jewell, MJ; Johnson, A; Karelin, A; Kaufman, LJ; Koffas, T; ucken, R Kr; Kuchenkov, A; Kumar, KS; Lan, Y; Larson, A; Lenardo, BG; Leonard, DS; Li, GS; Li, S; Li, Z; Licciardi, C; Lin, YH; MacLellan, R; McElroy, T; Michel, T; Mong, B; Moore, DC; Murray, K; Njoya, O; Nusair, O; Odian, A; Ostrovskiy, I; Perna, A; Piepke, A; Pocar, A; Retiere, F; Robinson, AL; Rowson, PC; Rudde, D; Runge, J; Schmidt, S; Sinclair, D; Skarpaas, K; Soma, AK; Stekhanov, V; Tarka, M; Thibado, S; Todd, J; Tolba, T; Totev, TI; Tsang, R; Veenstra, B; Veeraraghavan, V; Vogel, P; Vuilleumier, J-L; Wagenpfeil, M; Watkins, J; Weber, M; Wen, LJ; Wichoski, U; Wrede, G; Wu, SX; Xia, Q; Yahne, DR; Yang, L; Yen, Y-R; Zeldovich, O Ya; Ziegler, T
    A search for Majoron-emitting modes of the neutrinoless double-beta decay of $^{136}$Xe is performed with the full EXO-200 dataset. This dataset consists of a total $^{136}$Xe exposure of 234.1 kg$\cdot$yr, and includes data with detector upgrades that have improved the energy threshold relative to previous searches. A lower limit of T$_{1/2}^{\rm{^{136}Xe}}>$4.3$\cdot$10$^{24}$ yr at 90\% C.L. on the half-life of the spectral index $n=1$ Majoron decay was obtained, a factor of 3.6 more stringent than the previous limit from EXO-200, corresponding to a constraint on the Majoron-neutrino coupling constant of $|\langle g_{ee}^{M}\rangle|$$<(0.4$-$0.9)\cdot10^{-5}$. The lower threshold and the additional data taken resulted in a factor 8.4 improvement for the $n=7$ mode compared to the previous EXO search. This search provides the most stringent limits to-date on the Majoron-emitting decays of $^{136}$Xe with spectral indices $n=1,2,3,$ and 7.
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    Simulating the neutrino flux from the Spallation Neutron Source for the COHERENT experiment
    Collaboration, COHERENT; Akimov, D; An, P; Awe, C; Barbeau, PS; Becker, B; Belov, V; Bernardi, I; Blackston, MA; Bock, C; Bolozdynya, A; Browning, J; Cabrera-Palmer, B; Chernyak, D; Conley, E; Daughhetee, J; Detwiler, J; Ding, K; Durand, MR; Efremenko, Y; Elliott, SR; Fabris, L; Febbraro, M; Galambos, J; Rosso, A Gallo; Galindo-Uribarri, A; Green, MP; Heath, MR; Hedges, S; Hoang, D; Hughes, M; Iverson, E; Johnson, T; Khromov, A; Konovalov, A; Kozlova, E; Kumpan, A; Li, L; Link, JM; Liu, J; Mann, K; Markoff, DM; Mastroberti, J; McIntyre, M; Mueller, PE; Newby, J; Parno, DS; Penttila, SI; Pershey, D; Rapp, R; Ray, H; Raybern, J; Razuvaeva, O; Reyna, D; Rich, GC; Rimal, D; Ross, J; Rudik, D; Runge, J; Salvat, DJ; Salyapongse, AM; Scholberg, K; Shakirov, A; Simakov, G; Sinev, G; Snow, WM; Sosnovstsev, V; Suh, B; Tayloe, R; Tellez-Giron-Flores, K; Tolstukhin, I; Trotter, S; Ujah, E; Vanderwerp, J; Varner, RL; Virtue, CJ; Visser, G; Wongjirad, T; Yen, Y-R; Yoo, J; Yu, C-H; Zettlemoyer, J; Zhang, S
    The Spallation Neutron Source (SNS) at Oak 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 about 10% based on validation against available low-energy pion production data.
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    The EXO-200 detector, part II: Auxiliary Systems
    Ackerman, N; Albert, J; Auger, M; Auty, DJ; Badhrees, I; Barbeau, PS; Bartoszek, L; Baussan, E; Belov, V; Benitez-Medina, C; Bhatta, T; Breidenbach, M; Brunner, T; Cao, GF; Cen, WR; Chambers, C; Cleveland, B; Conley, R; Cook, S; Coon, M; Craddock, W; Craycraft, A; Cree, W; Daniels, T; Darroch, L; Daugherty, SJ; Daughhetee, J; Davis, CG; Davis, J; Delaquis, S; Mesrobian-Kabakian, A Der; deVoe, R; Didberidze, T; Dilling, J; Dobi, A; Dolgolenko, AG; Dolinski, MJ; Dunford, M; Echevers, J; Espic, L; Jr, W Fairbank; Fairbank, D; Farine, J; Feldmeier, W; Feyzbakhsh, S; Fierlinger, P; Fouts, K; Franco, D; Freytag, D; Fudenberg, D; Gautam, P; Giroux, G; Gornea, R; Graham, K; Gratta, G; Hagemann, C; Hall, C; Hall, K; Haller, G; Hansen, EV; Hargrove, C; Herbst, R; Herrin, S; Hodgson, J; Hughes, M; Iverson, A; Jamil, A; Jessiman, C; Jewell, MJ; Johnson, A; Johnson, TN; Johnston, S; Karelin, A; Kaufman, LJ; Killick, R; Koffas, T; Kravitz, S; Krücken, R; Kuchenkov, A; Kumar, KS; Lan, Y; Larson, A; Leonard, DS; Leonard, F; LePort, F; Li, GS; Li, S; Li, Z; Licciardi, C; Lin, YH; Mackay, D; MacLellan, R; Marino, M; Martin, J-M; Martin, Y; McElroy, T; McFarlane, K; Michel, T; Mong, B; Moore, DC; Murray, K; Neilson, R; Njoya, O; Nusair, O; O'Sullivan, K; Odian, A; Ostrovskiy, I; Ouellet, C; Piepke, A; Pocar, A; Prescott, CY; Pushkin, K; Retiere, F; Rivas, A; Robinson, AL; Rollin, E; Rowson, PC; Rozo, MP; Runge, J; Russell, JJ; Schmidt, S; Schubert, A; Sinclair, D; Skarpaas, K; Slutsky, S; Smith, E; Soma, AK; Stekhanov, V; Strickland, V; Swift, M; Tarka, M; Todd, J; Tolba, T; Tosi, D; Totev, TI; Tsang, R; Twelker, K; Veenstra, B; Veeraraghavan, V; Vuilleumier, J-L; Vuilleumier, J-M; Wagenpfeil, M; Waite, A; Walton, J; Walton, T; Wamba, K; Watkins, J; Weber, M; Wen, LJ; Wichoski, U; Wittgen, M; Wodin, J; Wood, J; Wrede, G; Wu, SX; Xia, Q; Yang, L; Yen, Y-R; Zeldovich, O Ya; Ziegler, T
    The EXO-200 experiment searched for neutrinoless double-beta decay of $^{136}$Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liquid xenon in an ultra-low background time projection chamber with ionization and scintillation detection and readout. This paper describes the design and performance of the various support systems necessary for detector operation, including cryogenics, xenon handling, and controls. Novel features of the system were driven by the need to protect the thin-walled detector chamber containing the liquid xenon, to achieve high chemical purity of the Xe, and to maintain thermal uniformity across the detector.