A. Piepke

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Dorian Q Fuller

University College London

David Seamon

Kansas State University

Darren Ward

Cal Poly Humboldt

Viacheslav Kuleshov

Stockholm University

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UNIVERSIDAD MAYOR de SAN ANDRES UMSA

juan m pleguezuelos

University of Granada

Hazel Nichols

Liverpool John Moores University

Eva Garcia-Vazquez

University of Oviedo / Universidad de Oviedo

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Shiraz University

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Papers by A. Piepke

Characterization of an Ionization Readout Tile for nEXO

Journal of Instrumentation, 2018

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Search for2νββdecay ofXe136to the01+excited state ofBa136with the EXO-200 liquid xenon detector

Physical Review C, 2016

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U.S. KamLAND Collaboration

nEXO: neutrinoless double beta decay search beyond 1028 year half-life sensitivity

Journal of Physics G: Nuclear and Particle Physics, 2021

The nEXO neutrinoless double beta (0νββ) decay experiment is designed to use a time projection ch... more The nEXO neutrinoless double beta (0νββ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon to search for the decay in 136Xe. Progress in the detector design, paired with higher fidelity in its simulation and an advanced data analysis, based on the one used for the final results of EXO-200, produce a sensitivity prediction that exceeds the half-life of 1028 years. Specifically, improvements have been made in the understanding of production of scintillation photons and charge as well as of their transport and reconstruction in the detector. The more detailed knowledge of the detector construction has been paired with more assays for trace radioactivity in different materials. In particular, the use of custom electroformed copper is now incorporated in the design, leading to a substantial reduction in backgrounds from the intrinsic radioactivity of detector materials. Furthermore, a number of assumptions from previous sensit...

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0 Ju l 2 01 2 Search for Neutrinoless Double-Beta Decay in 136 Xe with EXO-200

M. Auger, D.J. Auty, P.S. Barbeau, ∗ E. Beauchamp, V. Belov, C. Benitez-Medina, M. Breidenbach, T... more M. Auger, D.J. Auty, P.S. Barbeau, ∗ E. Beauchamp, V. Belov, C. Benitez-Medina, M. Breidenbach, T. Brunner, A. Burenkov, B. Cleveland, † S. Cook, T. Daniels, M. Danilov, C.G. Davis, S. Delaquis, R. deVoe, A. Dobi, M.J. Dolinski, A. Dolgolenko, M. Dunford, W. Fairbank Jr., J. Farine, W. Feldmeier, P. Fierlinger, D. Franco, G. Giroux, R. Gornea, K. Graham, G. Gratta, C. Hall, K. Hall, C. Hargrove, S. Herrin, M. Hughes, A. Johnson, T.N. Johnson, A. Karelin, L.J. Kaufman, A. Kuchenkov, K.S. Kumar, D.S. Leonard, F. Leonard, D. Mackay, ‡ R. MacLellan, M. Marino, B. Mong, M. Montero Dı́ez, A.R. Müller, § R. Neilson, ¶ R. Nelson, A. Odian, I. Ostrovskiy, K. O’Sullivan, C. Ouellet, A. Piepke, A. Pocar, C.Y. Prescott, K. Pushkin, P.C. Rowson, J.J. Russell, A. Sabourov, D. Sinclair, ∗∗ S. Slutsky, V. Stekhanov, T. Tolba, D. Tosi, K. Twelker, P. Vogel, J.-L. Vuilleumier, A. Waite, T. Walton, M. Weber, U. Wichoski, J. Wodin, J.D Wright, L. Yang, Y.-R. Yen, and O.Ya. Zeldovich

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Projected sensitivity of the LUX-ZEPLIN experiment to the 0νββ decay of Xe136

Physical Review C, 2020

The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double beta decay search in parallel to... more The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double beta decay search in parallel to the main science goal of discovering dark matter particle interactions. We report the expected LZ sensitivity to 136 Xe neutrinoless double beta decay, taking advantage of the significant (>600 kg) 136 Xe mass contained within the active volume of LZ without isotopic enrichment. After 1000 livedays, the median exclusion sensitivity to the half-life of 136 Xe is projected to be 1.06×10 26 years (90% confidence level), similar to existing constraints. We also report the expected sensitivity of a possible subsequent dedicated exposure using 90% enrichment with 136 Xe at 1.06×10 27 years.

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Erratum: “A Search for Electron Antineutrinos Associated with Gravitational-wave Events GW150914 and GW151226 Using KamLAND” (2016, ApJL, 829, L34)

The Astrophysical Journal, 2017

Some values of the coincidence search in Section 3 were not correct in the published article. The... more Some values of the coincidence search in Section 3 were not correct in the published article. The time differences of the closest event to GW150915, GW151226, and LVT151012 are 1.9h, 5.7h, and 1017s, respectively. The energies of the closest event are 2.07MeV, 2.67MeV, and 1.41MeV, respectively. Figures 1, 2, and 3 were not correct in the published article. The corrected figures are provided here.

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Neutrinos

This document represents the response of the Intensity Frontier Neutrino Working Group to the Sno... more This document represents the response of the Intensity Frontier Neutrino Working Group to the Snowmass charge. We summarize the current status of neutrino physics and identify many exciting future opportunities for studying the properties of neutrinos and for addressing important physics and astrophysics questions with neutrinos.

Sensitivity and discovery potential of the proposed nEXO experiment to neutrinoless double- β decay

Physical Review C, 2018

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The EXO-200 detector, part II: auxiliary systems

Journal of Instrumentation, 2022

The EXO-200 experiment searched for neutrinoless double-beta decay of 136Xe with a single-phase l... more The EXO-200 experiment searched for neutrinoless double-beta decay of 136Xe 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.

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Search for nucleon decays with EXO-200 A . Piepke –

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Projected sensitivities of the LUX-ZEPLIN (LZ) experiment to new physics via low-energy electron recoils

LUX-ZEPLIN (LZ) is a dark matter detector expected to obtain world-leading sensitivity to weakly ... more LUX-ZEPLIN (LZ) is a dark matter detector expected to obtain world-leading sensitivity to weakly interacting massive particles (WIMPs) interacting via nuclear recoils with a ~7-tonne xenon target mass. This manuscript presents sensitivity projections to several low-energy signals of the complementary electron recoil signal type: 1) an effective neutrino magnetic moment and 2) an effective neutrino millicharge, both for pp-chain solar neutrinos, 3) an axion flux generated by the Sun, 4) axion-like particles forming the galactic dark matter, 5) hidden photons, 6) mirror dark matter, and 7) leptophilic dark matter. World-leading sensitivities are expected in each case, a result of the large 5.6t 1000d exposure and low expected rate of electron recoil backgrounds in the $<$100keV energy regime. A consistent signal generation, background model and profile-likelihood analysis framework is used throughout.

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Lawrence Berkeley National Laboratory Recent Work Title solar neutrino measurement with KamLAND Permalink

We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7 Be solar ne... more We report a measurement of the neutrino-electron elastic scattering rate of 862 keV 7 Be solar neutrinos based on a 165.4 kton-days exposure of KamLAND. The observed rate is 582 ± 94 (kton-days) −1 , which corresponds to a 862 keV 7 Be solar neutrino flux of (3.26 ± 0.52) × 10 9 cm −2 s −1 , assuming a pure electron-flavor flux. Comparing this flux with the standard solar model prediction and further assuming three-flavor mixing, a νe survival probability of 0.66 ± 0.15 is determined from the KamLAND data. Utilizing a global three-flavor oscillation analysis, we obtain a total 7 Be solar neutrino flux of (5.82 ± 1.02) × 10 9 cm −2 s −1 , which is consistent with the standard solar model predictions.

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Lawrence Berkeley National Laboratory Recent Work Title Search for the proton decay mode with KamLAND Permalink

We present a search for the proton decay mode p → νK + based on an exposure of 8.97 kton-years in... more We present a search for the proton decay mode p → νK + based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from p → νK + with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is 0.9 ± 0.2 events. The nonbackground-subtracted limit on the partial proton lifetime is τ /B(p → νK +) > 5.4 × 10 32 years at 90% C.L.

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Projected WIMP sensitivity of the LUX-ZEPLIN dark matter experiment

Physical Review D, 2020

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Search for nucleon decays with EXO-200

Physical Review D, 2018

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GEANT4 models of HPGe detectors for radioassay

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2019

Radiation transport models of two high purity germanium detectors, GeII and GeIII, located at the... more Radiation transport models of two high purity germanium detectors, GeII and GeIII, located at the University of Alabama have been created in GEANT4 [1]. These detectors have been used extensively for radioassay measurements of materials used in various low background experiments. The two models have been validated against actual data under several scenarios typically seen in radioassay measurements. The systematic uncertainties of the models for GeII and GeIII are estimated to be ∼12% and ∼9% respectively.

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LUX-ZEPLIN (LZ) Technical Design Report

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Recent double beta decay results

AIP Conference Proceedings, 1992

The status and recent results of second generation betabeta-experiments using isotopically enrich... more The status and recent results of second generation betabeta-experiments using isotopically enriched source materials are described. These experiments are at present the most sensitive tools to distinguish Dirac from Majorana neutrinos. The at present most advanced experimental techniques, namely the use of high-resolution calorimetric detectors and of time projection chambers are compared. New limits on the Majorana neutrino mass as

$Research paper thumbnail of Measurements of the ion fraction and mobility ofα−andβ-decay products in liquid xenon using the EXO-200 detector$