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Fundamental and Computational Sciences Directorate

Staff information

Tom Alexander

Physicist
Pacific Northwest National Laboratory
PO Box 999
MSIN: J4-60
Richland, WA 99352

PNNL Publications

2023

  • Agnes P., I. Albuquerque, T.R. Alexander, A.K. Alton, M. Ave, H.O. Back, and G. Batignani, et al. 2023. "Search for Dark Matter Particle Interactions with Electron Final States with DarkSide-50." Physical Review Letters 130, no. 10:Art. No. 101002. PNNL-SA-184295. doi:10.1103/PhysRevLett.130.101002
  • Agnes P., I. Albuquerque, T.R. Alexander, A.K. Alton, M. Ave, H.O. Back, and G. Batignani, et al. 2023. "Search for dark-matter--nucleon interactions via Migdal effect with DarkSide-50." Physical Review Letters 130, no. 10:Art. No. 101001. PNNL-SA-184234. doi:10.1103/PhysRevLett.130.101001

2021

  • Agnes P., I. Albuquerque, T.R. Alexander, A.K. Alton, M. Ave, H.O. Back, and G. Batignani, et al. 2021. "Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50." Physical Review D 104, no. 8:Art. No. 082005. PNNL-SA-180028. doi:10.1103/PhysRevD.104.082005
  • Agnes P., S. Albergo, F. Albuquerque, T.R. Alexander, A. Alici, A. Alton, and P. Amaudruz, et al. 2021. "Sensitivity of future liquid argon dark matter search experiments to core-collapse supernova neutrinos." Journal of Cosmology and Astroparticle Physics 2021, no. 3:Article No.043. PNNL-SA-161458. doi:10.1088/1475-7516/2021/03/043
  • Agnes P., S. Albergo, I. Albuquerque, T.R. Alexander, A. Alici, A.K. Alton, and P. Amaudruz, et al. 2021. "Separating 39Ar from 40Ar by cryogenic distillation with Aria for dark-matter searches." European Physical Journal C 81, no. 4:Article No. 359. PNNL-SA-161332. doi:10.1140/epjc/s10052-021-09121-9
  • Alexander T.R., R.A. Bunker, E.K. Mace, K.S. Thommasson, C.M. Johnson, and J.D. Lowrey. 2021. UNESE Argon-39 Measurement Techniques: Developing an above-ground Argon-39 Measurement Capability. PNNL-30869. Richland, WA: Pacific Northwest National Laboratory. UNESE Argon-39 Measurement Techniques: Developing an above-ground Argon-39 Measurement Capability
  • Fritz B.G., T.R. Alexander, T.W. Bowyer, J.C. Hayes, E.K. Mace, and V.T. Woods. 2021. "Comparison of near-background concentrations of Argon-37 and Xenon-133 in the Atmosphere." Journal of Environmental Radioactivity 233. PNNL-SA-158330. doi:10.1016/j.jenvrad.2021.106590
  • Johnson C.M., B.L. Abromeit, T.R. Alexander, J.D. Lowrey, E.K. Mace, M.F. Mayer, and J.I. McIntyre. 2021. Analysis methods for quantifying Xe-127 samples from the UNESE project. PNNL-30870. Richland, WA: Pacific Northwest National Laboratory. Analysis methods for quantifying Xe-127 samples from the UNESE project
  • Johnson C.M., J.D. Lowrey, T.R. Alexander, E.K. Mace, and A.M. Prinke. 2021. "Measurements of the emanation of 37Ar and 39Ar from irradiated rocks and powders." Journal of Radioanalytical and Nuclear Chemistry 329, no. 2:969 - 974. PNNL-SA-160972. doi:10.1007/s10967-021-07827-4
  • Johnson C.M., J.D. Lowrey, T.R. Alexander, E.K. Mace, and B.J. Riley. 2021. Measurements of emanation of Ar-37 and Ar-39 from irradiated rocks and powders. PNNL-30868. Richland, WA: Pacific Northwest National Laboratory. Measurements of emanation of Ar-37 and Ar-39 from irradiated rocks and powders

2020

  • Aalseth C.E., S. Abdelhakim, F. Acerbi, P. Agnes, R. Ajaj, I. Albuquerque, and T.R. Alexander, et al. 2020. "Design and construction of a new detector to measure ultra-low radioactive-isotope contamination of argon." Journal of Instrumentation 15, no. 2:Article No. P02024. PNNL-SA-157079. doi:10.1088/1748-0221/15/02/P02024
  • Agnes P., I. Albuquerque, T.R. Alexander, A.K. Alton, M. Ave, H.O. Back, and G. Batignani, et al. 2020. "Effective field theory interactions for liquid argon target in DarkSide-50 experiment." Physical Review D 101, no. 6:Article No. 062002. PNNL-SA-161358. doi:10.1103/PhysRevD.101.062002
  • Fritz B.G., T.R. Alexander, J.C. Hayes, E.K. Mace, and V.T. Woods. 2020. Measurement of Argon-37 Background Concentrations in the Atmosphere. PNNL-30583. Richland, WA: Pacific Northwest National Laboratory. Measurement of Argon-37 Background Concentrations in the Atmosphere
  • Hayes J.C., C.E. Aalseth, T.R. Alexander, H.O. Back, E.D. Church, M.P. Foxe, and T.W. Hossbach, et al. 2020. "High Throughput Argon-37 Field System." Pure and Applied Geophysics. PNNL-SA-149601. doi:10.1007/s00024-020-02584-z
  • Johnson C.M., J.E. Fast, B.D. Milbrath, J.D. Lowrey, B.G. Fritz, T.R. Alexander, and M.F. Mayer, et al. 2020. UNESE Phase 2: Injection and measurement of gaseous tracers at U-12p Tunnel. PNNL-30202. Richland, WA: Pacific Northwest National Laboratory. UNESE Phase 2: Injection and measurement of gaseous tracers at U-12p Tunnel

2019

  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, M. Ave, H.O. Back, and G. Batignani, et al. 2019. "Measurement of the ion fraction and mobility of 218Po produced in 222Rn decays in liquid argon." Journal of Instrumentation 14, no. 11:Article No.P11018. PNNL-SA-160911. doi:10.1088/1748-0221/14/11/P11018
  • Johnson C.M., C.E. Aalseth, T.R. Alexander, T.W. Bowyer, V. Chipman, A.R. Day, and S. Drellack, et al. 2019. "Migration of noble gas tracers at the site of an underground nuclear explosion at the Nevada National Security Site." Journal of Environmental Radioactivity 208-209. PNNL-SA-143881. doi:10.1016/j.jenvrad.2019.106047
  • Saldanha R.N., H.O. Back, H. Tsang, T.R. Alexander, S.R. Elliott, S.A. Ferrara, and E.K. Mace, et al. 2019. "Cosmogenic production of 39Ar and 37Ar in argon." Physical Review C 100, no. 2:Article No. 024608. PNNL-SA-141556. doi:10.1103/PhysRevC.100.024608

2018

  • Aalseth C.E., F. Acerbi, P. Agnes, I. Albuquerque, T.R. Alexander, A. Alici, and A. Alton, et al. 2018. "DarkSide-20k: A 20 tonne two-phase LAr TPC for direct dark matter detection at LNGS." European Physical Journal Plus 133, no. 3:Article No. 131. PNNL-SA-134133. doi:10.1140/epjp/i2018-11973-4
  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, J.R. Araujo, D.M. Asner, and M. Ave, et al. 2018. "Constraints on Sub-GeV Dark Matter-Electron Scattering from the DarkSide-50 Experiment." Physical Review Letters 121, no. 11:Article number 111303. PNNL-SA-132745. doi:10.1103/PhysRevLett.121.111303
  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, J.R. Araujo, D.M. Asner, and M. Ave, et al. 2018. "Low-mass Dark Matter Search with the DarkSide-50 Experiment." Physical Review Letters 121, no. 8:081307. PNNL-SA-132892. doi:10.1103/PhysRevLett.121.081307

2017

  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, D.M. Asner, H.O. Back, and B. Baldin, et al. 2017. "CALIS - a Calibration Insertion System for the DarkSide-50 Dark Matter Search Experiment." Journal of Instrumentation 12, no. 12:Article No. T12004. PNNL-SA-131491. doi:10.1088/1748-0221/12/12/T12004
  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, D.M. Asner, H.O. Back, and B. Baldin, et al. 2017. "Effect of low electric fields on alpha scintillation light yield in liquid argon." Journal of Instrumentation 12, no. 1:Article No. P01021. PNNL-SA-127592. doi:10.1088/1748-0221/12/01/P01021
  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, D.M. Asner, H.O. Back, and K. Biery, et al. 2017. "Simulation of argon response and light detection in the DarkSide-50 dual phase TPC." Journal of Instrumentation 12, no. 10:Article No. P10015. PNNL-SA-131300. doi:10.1088/1748-0221/12/10/P10015
  • Agnes P., I. Albuquerque, T.R. Alexander, A. Alton, K. Arisaka, D.M. Asner, and M. Ave, et al. 2017. "The Electronics, Trigger and Data Acquisition System for the Liquid Argon Time Projection Chamber of the DarkSide-50 Search for Dark Matter." Journal of Instrumentation 12, no. 12:P1201. PNNL-SA-131302. doi:10.1088/1748-0221/12/12/P12011
  • Mace E.K., C.E. Aalseth, T.R. Alexander, H.O. Back, A.R. Day, E.W. Hoppe, and M.E. Keillor, et al. 2017. "Simultaneous Measurement of Tritium and Radiocarbon by Ultra-Low-Background Proportional Counting." Applied Radiation and Isotopes 126. PNNL-SA-120393. doi:10.1016/j.apradiso.2016.12.033
  • McIntyre J.I., C.E. Aalseth, T.R. Alexander, H.O. Back, B.J. Bellgraph, T.W. Bowyer, and V.D. Chipman, et al. 2017. "Measurements of Argon-39 at theU20az Underground Nuclear Explosion Site." Journal of Environmental Radioactivity 178-179. PNNL-26326. doi:10.1016/j.jenvrad.2017.07.013
  • Moran J.J., T.R. Alexander, C.E. Aalseth, H.O. Back, E.K. Mace, C.T. Overman, and A. Seifert, et al. 2017. "Improvements to sample processing and measurement to enable more widespread environmental application of tritium." Applied Radiation and Isotopes 126. PNNL-SA-120318. doi:10.1016/j.apradiso.2017.01.033
  • Westerdale S., J. Xu, E. Shields, F. Froborg, F. Calaprice, T.R. Alexander, and A. Aprahamian, et al. 2017. "Quenching Measurements and Modeling of a Boron-Loaded Organic Liquid Scintillator." Journal of Instrumentation 12, no. 8:Article No. P08002. PNNL-SA-125113. doi:10.1088/1748-0221/12/08/P08002

2016

  • Agnes P., L. Agostino, I. Albuquerque, T.R. Alexander, A. Alton, K. Arisaka, and H.O. Back, et al. 2016. "The DarkSide project." Journal of Instrumentation 11, no. 2:Article No. C02051. PNNL-SA-124962. doi:10.1088/1748-0221/11/02/C02051
  • Agnes P., L. Agostino, I. Albuquerque, T.R. Alexander, A. Alton, K. Arisaka, and H.O. Back, et al. 2016. "The electronics and data acquisition system for the DarkSide-50 Veto Detectors." Journal of Instrumentation 11, no. 12:Article No. P12007. PNNL-SA-131322. doi:10.1088/1748-0221/11/12/P12007
  • Davini S., P. Agnes, L. Agostino, I. Albuquerque, T.R. Alexander, A. Alton, and K. Arisaka, et al. 2016. "The DarkSide awakens." Journal of Physics: Conference Series 718, no. 4:Article No. 042016. PNNL-SA-125114. doi:10.1088/1742-6596/718/4/042016

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