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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Dr Niamh Fearon

PDRA

Research theme

  • Particle astrophysics & cosmology

Sub department

  • Particle Physics

Research groups

  • LUX-ZEPLIN
niamh.fearon@physics.ox.ac.uk
Inspire HEP profile
  • About
  • Publications

First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment

Phys.Rev.Lett. 131 (2023) 4, 041002

Authors:

J. Aalbers, D.S. Akerib, C.W. Akerlof, A.K. Al Musalhi, F. Alder, A. Alqahtani, S.K. Alsum, C.S. Amarasinghe, A. Ames, T.J. Anderson, N. Angelides, H.M. Araújo, J.E. Armstrong, M. Arthurs, S. Azadi, A.J. Bailey, A. Baker, J. Balajthy, S. Balashov, J. Bang, J.W. Bargemann, M.J. Barry, J. Barthel, D. Bauer, A. Baxter, K. Beattie, J. Belle, P. Beltrame, J. Bensinger, T. Benson, E.P. Bernard, A. Bhatti, A. Biekert, T.P. Biesiadzinski, H.J. Birch, B. Birrittella, G.M. Blockinger, K.E. Boast, B. Boxer, R. Bramante, C.A.J. Brew, P. Brás, J.H. Buckley, V.V. Bugaev, S. Burdin, J.K. Busenitz, M. Buuck, R. Cabrita, C. Carels, D.L. Carlsmith, B. Carlson, M.C. Carmona-Benitez, M. Cascella, C. Chan, A. Chawla, H. Chen, J.J. Cherwinka, N.I. Chott, A. Cole, J. Coleman, M.V. Converse, A. Cottle, G. Cox, W.W. Craddock, O. Creaner, D. Curran, A. Currie, J.E. Cutter, C.E. Dahl, A. David, J. Davis, T.J.R. Davison, J. Delgaudio, S. Dey, L. de Viveiros, A. Dobi, J.E.Y. Dobson, E. Druszkiewicz, A. Dushkin, T.K. Edberg, W.R. Edwards, M.M. Elnimr, W.T. Emmet, S.R. Eriksen, C.H. Faham, A. Fan, S. Fayer, N.M. Fearon, S. Fiorucci, H. Flaecher, P. Ford, V.B. Francis, E.D. Fraser, T. Fruth, R.J. Gaitskell, N.J. Gantos, D. Garcia, A. Geffre, V.M. Gehman, J. Genovesi , C. Ghag, R. Gibbons, E. Gibson, M.G.D. Gilchriese, S. Gokhale, B. Gomber, J. Green, A. Greenall, S. Greenwood, M.G.D.van der Grinten, C.B. Gwilliam, C.R. Hall, S. Hans, K. Hanzel, A. Harrison, E. Hartigan-O'Connor, S.J. Haselschwardt, S.A. Hertel, G. Heuermann, C. Hjemfelt, M.D. Hoff, E. Holtom, J.Y-K. Hor, M. Horn, D.Q. Huang, D. Hunt, C.M. Ignarra, R.G. Jacobsen, O. Jahangir, R.S. James, S.N. Jeffery, W. Ji, J. Johnson, A.C. Kaboth, A.C. Kamaha, K. Kamdin, V. Kasey, K. Kazkaz, J. Keefner, D. Khaitan, M. Khaleeq, A. Khazov, I. Khurana, Y.D. Kim, C.D. Kocher, D. Kodroff, L. Korley, E.V. Korolkova, J. Kras, H. Kraus, S. Kravitz, H.J. Krebs, L. Kreczko, B. Krikler, V.A. Kudryavtsev, S. Kyre, B. Landerud, E.A. Leason, C. Lee, J. Lee, D.S. Leonard, R. Leonard, K.T. Lesko, C. Levy, J. Li, F.-T. Liao, J. Liao, J. Lin, A. Lindote, R. Linehan, W.H. Lippincott, R. Liu, X. Liu, Y. Liu, C. Loniewski, M.I. Lopes, E. Lopez Asamar, B. López Paredes, W. Lorenzon, D. Lucero, S. Luitz, J.M. Lyle, P.A. Majewski, J. Makkinje, D.C. Malling, A. Manalaysay, L. Manenti, R.L. Mannino, N. Marangou, M.F. Marzioni, C. Maupin, M.E. McCarthy, C.T. McConnell, D.N. McKinsey, J. McLaughlin, Y. Meng, J. Migneault, E.H. Miller, E. Mizrachi, J.A. Mock, A. Monte, M.E. Monzani, J.A. Morad, J.D. Morales Mendoza, E. Morrison, B.J. Mount, M. Murdy, A.St.J. Murphy, D. Naim, A. Naylor, C. Nedlik, C. Nehrkorn, F. Neves, A. Nguyen, J.A. Nikoleyczik, A. Nilima, J. O'Dell, F.G. O'Neill, K. O'Sullivan, I. Olcina, M.A. Olevitch, K.C. Oliver-Mallory, J. Orpwood, D. Pagenkopf, S. Pal, K.J. Palladino, J. Palmer, M. Pangilinan, N. Parveen, S.J. Patton, E.K. Pease, B. Penning, C. Pereira, G. Pereira, E. Perry, T. Pershing, I.B. Peterson, A. Piepke, J. Podczerwinski, D. Porzio, S. Powell, R.M. Preece, K. Pushkin, Y. Qie, B.N. Ratcliff, J. Reichenbacher, L. Reichhart, C.A. Rhyne, A. Richards, Q. Riffard, G.R.C. Rischbieter, J.P. Rodrigues, A. Rodriguez, H.J. Rose, R. Rosero, P. Rossiter, T. Rushton, G. Rutherford, D. Rynders, J.S. Saba, D. Santone, A.B.M.R. Sazzad, R.W. Schnee, P.R. Scovell, D. Seymour, S. Shaw, T. Shutt, J.J. Silk, C. Silva, G. Sinev, K. Skarpaas, W. Skulski, R. Smith, M. Solmaz, V.N. Solovov, P. Sorensen, J. Soria, I. Stancu, M.R. Stark, A. Stevens, T.M. Stiegler, K. Stifter, R. Studley, B. Suerfu, T.J. Sumner, P. Sutcliffe, N. Swanson, M. Szydagis, M. Tan, D.J. Taylor, R. Taylor, W.C. Taylor, D.J. Temples, B.P. Tennyson, P.A. Terman, K.J. Thomas, D.R. Tiedt, M. Timalsina, W.H. To, A. Tomás, Z. Tong, D.R. Tovey, J. Tranter, M. Trask, M. Tripathi, D.R. Tronstad, C.E. Tull, W. Turner, L. Tvrznikova, U. Utku, J. Va'vra, A. Vacheret, A.C. Vaitkus, J.R. Verbus, E. Voirin, W.L. Waldron, A. Wang, B. Wang, J.J. Wang, W. Wang, Y. Wang, J.R. Watson, R.C. Webb, A. White, D.T. White, J.T. White, R.G. White, T.J. Whitis, M. Williams, W.J. Wisniewski, M.S. Witherell, F.L.H. Wolfs, J.D. Wolfs, S. Woodford, D. Woodward, S.D. Worm, C.J. Wright, Q. Xia, X. Xiang, Q. Xiao, J. Xu, M. Yeh, J. Yin, I. Young, P. Zarzhitsky, A. Zuckerman, E.A. Zweig

Abstract:

The LUX-ZEPLIN experiment is a dark matter detector centered on a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN’s first search for weakly interacting massive particles (WIMPs) with an exposure of 60 live days using a fiducial mass of 5.5 t. A profile-likelihood ratio analysis shows the data to be consistent with a background-only hypothesis, setting new limits on spin-independent WIMP-nucleon, spin-dependent WIMP-neutron, and spin-dependent WIMP-proton cross sections for WIMP masses above 9  GeV/c2. The most stringent limit is set for spin-independent scattering at 36  GeV/c2, rejecting cross sections above 9.2×10-48  cm at the 90% confidence level.
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Background determination for the LUX-ZEPLIN dark matter experiment

Phys.Rev.D 108 (2023) 1, 012010

Authors:

J. Aalbers, D.S. Akerib, A.K. Al Musalhi, F. Alder, S.K. Alsum, C.S. Amarasinghe, A. Ames, T.J. Anderson, N. Angelides, H.M. Araújo, J.E. Armstrong, M. Arthurs, A. Baker, J. Bang, J.W. Bargemann, A. Baxter, K. Beattie, P. Beltrame, E.P. Bernard, A. Bhatti, A. Biekert, T.P. Biesiadzinski, H.J. Birch, G.M. Blockinger, B. Boxer, C.A.J. Brew, P. Brás, S. Burdin, M. Buuck, R. Cabrita, M.C. Carmona-Benitez, C. Chan, A. Chawla, H. Chen, A.P.S. Chiang, N.I. Chott, M.V. Converse, A. Cottle, G. Cox, O. Creaner, C.E. Dahl, A. David, S. Dey, L. de Viveiros, C. Ding, J.E.Y. Dobson, E. Druszkiewicz, S.R. Eriksen, A. Fan, N.M. Fearon, S. Fiorucci, H. Flaecher, E.D. Fraser, T. Fruth, R.J. Gaitskell, J. Genovesi, C. Ghag, R. Gibbons, M.G.D. Gilchriese, S. Gokhale, J. Green, M.G.D.van der Grinten, C.B. Gwilliam, C.R. Hall, S. Han, E. Hartigan-O'Connor, S.J. Haselschwardt, S.A. Hertel, G. Heuermann, M. Horn, D.Q. Huang, D. Hunt, C.M. Ignarra, R.G. Jacobsen, O. Jahangir, R.S. James, J. Johnson, A.C. Kaboth, A.C. Kamaha, D. Khaitan, I. Khurana, R. Kirk, D. Kodroff, L. Korley, E.V. Korolkova, H. Kraus, S. Kravitz, L. Kreczko, B. Krikler, V.A. Kudryavtsev, E.A. Leason, J. Lee, D.S. Leonard, K.T. Lesko, C. Levy, J. Lin, A. Lindote, R. Linehan, W.H. Lippincott, X. Liu , M.I. Lopes, E. Lopez Asamar, B. López Paredes, W. Lorenzon, C. Lu, S. Luitz, P.A. Majewski, A. Manalaysay, R.L. Mannino, N. Marangou, M.E. McCarthy, D.N. McKinsey, J. McLaughlin, E.H. Miller, E. Mizrachi, A. Monte, M.E. Monzani, J.D. Morales Mendoza, E. Morrison, B.J. Mount, M. Murdy, A.St.J. Murphy, D. Naim, A. Naylor, C. Nedlik, H.N. Nelson, F. Neves, A. Nguyen, J.A. Nikoleyczik, I. Olcina, K.C. Oliver-Mallory, J. Orpwood, K.J. Palladino, J. Palmer, N. Parveen, S.J. Patton, B. Penning, G. Pereira, E. Perry, T. Pershing, A. Piepke, D. Porzio, S. Poudel, Y. Qie, J. Reichenbacher, C.A. Rhyne, Q. Riffard, G.R.C. Rischbieter, H.S. Riyat, R. Rosero, P. Rossiter, T. Rushton, D. Santone, A.B.M.R. Sazzad, R.W. Schnee, S. Shaw, T. Shutt, J.J. Silk, C. Silva, G. Sinev, R. Smith, M. Solmaz, V.N. Solovov, P. Sorensen, J. Soria, I. Stancu, A. Stevens, K. Stifter, B. Suerfu, T.J. Sumner, N. Swanson, M. Szydagis, R. Taylor, W.C. Taylor, D.J. Temples, P.A. Terman, D.R. Tiedt, M. Timalsina, Z. Tong, D.R. Tovey, J. Tranter, M. Trask, M. Tripathi, D.R. Tronstad, W. Turner, U. Utku, A.C. Vaitkus, A. Wang, J.J. Wang, W. Wang, Y. Wang, J.R. Watson, R.C. Webb, T.J. Whitis, M. Williams, F.L.H. Wolfs, S. Woodford, D. Woodward, C.J. Wright, Q. Xia, X. Xiang, J. Xu, M. Yeh

Abstract:

The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to 9.2×10-48  cm2 for the spin-independent interaction of a 36  GeV/c2 WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was (6.3±0.5)×10-5  events/keVee/kg/day in the low-energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.
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A next-generation liquid xenon observatory for dark matter and neutrino physics

J.Phys.G 50 (2023) 1, 013001

Authors:

J Aalbers et al.

Abstract:

The nature of dark matter and properties of neutrinos are among the most pressing issues in contemporary particle physics. The dual-phase xenon time-projection chamber is the leading technology to cover the available parameter space for weakly interacting massive particles, while featuring extensive sensitivity to many alternative dark matter candidates. These detectors can also study neutrinos through neutrinoless double-beta decay and through a variety of astrophysical sources. A next-generation xenon-based detector will therefore be a true multi-purpose observatory to significantly advance particle physics, nuclear physics, astrophysics, solar physics, and cosmology. This review article presents the science cases for such a detector.
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Cosmogenic production of Ar37 in the context of the LUX-ZEPLIN experiment

Phys.Rev.D 105 (2022) 8, 082004

Authors:

J. Aalbers, D.S. Akerib, A.K. Al Musalhi, F. Alder, S.K. Alsum, C.S. Amarasinghe, A. Ames, T.J. Anderson, N. Angelides, H.M. Araújo, J.E. Armstrong, M. Arthurs, X. Bai, A. Baker, J. Balajthy, S. Balashov, J. Bang, J.W. Bargemann, D. Bauer, A. Baxter, K. Beattie, E.P. Bernard, A. Bhatti, A. Biekert, T.P. Biesiadzinski, H.J. Birch, G.M. Blockinger, E. Bodnia, B. Boxer, C.A.J. Brew, P. Brás, S. Burdin, J.K. Busenitz, M. Buuck, R. Cabrita, M.C. Carmona-Benitez, M. Cascella, C. Chan, A. Chawla, H. Chen, N.I. Chott, A. Cole, M.V. Converse, A. Cottle, G. Cox, O. Creaner, J.E. Cutter, C.E. Dahl, A. David, L. de Viveiros, J.E.Y. Dobson, E. Druszkiewicz, S.R. Eriksen, A. Fan, S. Fayer, N.M. Fearon, S. Fiorucci, H. Flaecher, E.D. Fraser, T. Fruth, R.J. Gaitskell, J. Genovesi, C. Ghag, E. Gibson, M.G.D. Gilchriese, S. Gokhale, M.G.D.van der Grinten, C.B. Gwilliam, C.R. Hall, S.J. Haselschwardt, S.A. Hertel, M. Horn, D.Q. Huang, D. Hunt, C.M. Ignarra, O. Jahangir, R.S. James, W. Ji, J. Johnson, A.C. Kaboth, A.C. Kamaha, K. Kamdin, D. Khaitan, A. Khazov, I. Khurana, D. Kodroff, L. Korley, E.V. Korolkova, H. Kraus, S. Kravitz, L. Kreczko, V.A. Kudryavtsev, E.A. Leason, D.S. Leonard, K.T. Lesko, C. Levy, J. Lee, J. Lin, A. Lindote, R. Linehan , W.H. Lippincott, X. Liu, M.I. Lopes, E. Lopez Asamar, B. Lopez-Paredes, W. Lorenzon, S. Luitz, P.A. Majewski, A. Manalaysay, L. Manenti, R.L. Mannino, N. Marangou, M.E. McCarthy, D.N. McKinsey, J. McLaughlin, E.H. Miller, E. Mizrachi, A. Monte, M.E. Monzani, J.A. Morad, J.D. Morales Mendoza, E. Morrison, B.J. Mount, A.St.J. Murphy, D. Naim, A. Naylor, C. Nedlik, H.N. Nelson, F. Neves, J.A. Nikoleyczik, A. Nilima, I. Olcina, K. Oliver-Mallory, S. Pal, K.J. Palladino, J. Palmer, N. Parveen, S.J. Patton, E.K. Pease, B. Penning, G. Pereira, E. Perry, J. Pershing, A. Piepke, D. Porzio, Y. Qie, J. Reichenbacher, C.A. Rhyne, A. Richards, Q. Riffard, %Q. Riffard, G.R.C. Rischbieter, R. Rosero, P. Rossiter, T. Rushton, D. Santone, A.B.M.R. Sazzad, R.W. Schnee, P.R. Scovell, S. Shaw, T.A. Shutt, J.J. Silk, C. Silva, G. Sinev, R. Smith, M. Solmaz, V.N. Solovov, P. Sorensen, J. Soria, I. Stancu, A. Stevens, K. Stifter, B. Suerfu, T.J. Sumner, N. Swanson, M. Szydagis, W.C. Taylor, R. Taylor, D.J. Temples, P.A. Terman, D.R. Tiedt, M. Timalsina, W.H. To, Z. Tong, D.R. Tovey, M. Trask, M. Tripathi, D.R. Tronstad, W. Turner, U. Utku, A. Vaitkus, B. Wang, Y. Wang, J.J. Wang, W. Wang, J.R. Watson, R.C. Webb, R.G. White, T.J. Whitis, M. Williams, F.L.H. Wolfs, S. Woodford, D. Woodward, C.J. Wright, Q. Xia, X. Xiang, J. Xu, M. Yeh

Abstract:

We estimate the amount of Ar37 produced in natural xenon via cosmic-ray-induced spallation, an inevitable consequence of the transportation and storage of xenon on the Earth’s surface. We then calculate the resulting Ar37 concentration in a 10-tonne payload (similar to that of the LUX-ZEPLIN experiment) assuming a representative schedule of xenon purification, storage, and delivery to the underground facility. Using the spallation model by Silberberg and Tsao, the sea-level production rate of Ar37 in natural xenon is estimated to be 0.024  atoms/kg/day. Assuming the xenon is successively purified to remove radioactive contaminants in 1-tonne batches at a rate of 1  tonne/month, the average Ar37 activity after 10 tons are purified and transported underground is 0.058−0.090  μBq/kg, depending on the degree of argon removal during above-ground purification. Such cosmogenic Ar37 will appear as a noticeable background in the early science data, while decaying with a 35-day half-life. This newly noticed production mechanism of Ar37 should be considered when planning for future liquid-xenon-based experiments
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Projected sensitivity of the LUX-ZEPLIN experiment to the two-neutrino and neutrinoless double β decays of 134 Xe

Phys.Rev.C 104 (2021) 6, 065501

Authors:

D. S. Akerib, A. K. Al Musalhi, S. K. Alsum, C. S. Amarasinghe, A. Ames, T. J. Anderson, N. Angelides, H. M. Araujo, J. E. Armstrong, M. Arthurs, X. Bai, J. Balajthy, S. Balashov, J. Bang, J. W. Bargemann, D. Bauer, A. Baxter, P. Beltrame, E. P. Bernard, A. Bernstein, A. Bhatti, A. Biekert, T. P. Biesiadzinski, H. J. Birch, G. M. Blockinger, E. Bodnia, B. Boxer, C. A. J. Brew, P. Bras, S. Burdin, J. K. Busenitz, M. Buuck, R. Cabrita, M. C. Carmona-Benitez, M. Cascella, C. Chan, N. I. Chott, A. Cole, M. V. Converse, A. Cottle, G. Cox, O. Creaner, J. E. Cutter, C. E. Dahl, L. de Viveiros, J. E. Y. Dobson, E. Druszkiewicz, S. R. Eriksen, A. Fan, S. Fayer, N. M. Fearon, S. Fiorucci, H. Flaecher, E. D. Fraser, T. Fruth, R. J. Gaitskell, J. Genovesi, C. Ghag, E. Gibson, S. Gokhale, M. G. D. van der Grinten, C. B. Gwilliam, C. R. Hall, S. J. Haselschwardt, S. A. Hertel, M. Horn, D. Q. Huang, C. M. Ignarra, O. Jahangir, R. S. James, W. Ji, J. Johnson, A. C. Kaboth, A. C. Kamaha, K. Kamdin, K. Kazkaz, D. Khaitan, A. Khazov, I. Khurana, D. Kodroff, L. Korley, E. V. Korolkova, H. Kraus, S. Kravitz, L. Kreczko, B. Krikler, V. A. Kudryavtsev, E. A. Leason, J. Lee, D. S. Leonard, K. T. Lesko, C. Levy, J. Liao, J. Lin, A. Lindote, R. Linehan, W. H. Lippincott, X. Liu , M. I. Lopes, E. Lopez Asamar, B. Lopez Paredes, W. Lorenzon, S. Luitz, P. A. Majewski, A. Manalaysay, L. Manenti, R. L. Mannino, N. Marangou, M. E. McCarthy, D. N. McKinsey, J. McLaughlin, E. H. Miller, E. Mizrachi, A. Monte, M. E. Monzani, J. A. Morad, J. D. Morales Mendoza, E. Morrison, B. J. Mount, A. St. J. Murphy, D. Naim, A. Naylor, C. Nedlik, H. N. Nelson, F. Neves, J. A. Nikoleyczik, A. Nilima, I. Olcina, K. C. Oliver-Mallory, S. Pal, K. J. Palladino, J. Palmer, S. Patton, N. Parveen, E. K. Pease, B. Penning, G. Pereira, A. Piepke, Y. Qie, J. Reichenbacher, C. A. Rhyne, A. Richards, Q. Riffard, G. R. C. Rischbieter, R. Rosero, P. Rossiter, D. Santone, A. B. M. R. Sazzad, R. W. Schnee, P. R. Scovell, S. Shaw, T. A. Shutt, J. J. Silk, C. Silva, R. Smith, M. Solmaz, V. N. Solovov, P. Sorensen, J. Soria, I. Stancu, A. Stevens, K. Stifter, B. Suerfu, T. J. Sumner, N. Swanson, M. Szydagis, W. C. Taylor, R. Taylor, D. J. Temples, P. A. Terman, D. R. Tiedt, M. Timalsina, W. H. To, D. R. Tovey, M. Tripathi, D. R. Tronstad, W. Turner, U. Utku, A. Vaitkus, B. Wang, J. J. Wang, W. Wang, J. R. Watson, R. C. Webb, R. G. White, T. J. Whitis, M. Williams, F. L. H. Wolfs, D. Woodward, C. J. Wright, X. Xiang, J. Xu, M. Yeh, P. Zarzhitsky

Abstract:

The projected sensitivity of the LUX-ZEPLIN (LZ) experiment to two-neutrino and neutrinoless double β decay of 134Xe is presented. LZ is a 10-tonne xenon time-projection chamber optimized for the detection of dark matter particles and is expected to start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass of natural xenon provides an exceptional opportunity to search for the double β decay of 134Xe, for which xenon detectors enriched in 136Xe are less effective. For the two-neutrino decay mode, LZ is predicted to exclude values of the half-life up to 1.7×1024 years at 90% confidence level (CL) and has a three-sigma observation potential of 8.7×1023 years, approaching the predictions of nuclear models. For the neutrinoless decay mode LZ, is projected to exclude values of the half-life up to 7.3×1024 years at 90% CL.
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