Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility

(The LUX-ZEPLIN (LZ) Collaboration)

Research output: Contribution to journalArticle

Abstract

Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from γ-rays emitted by 40K and the 238U and 232Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4850-foot level. In order to characterise the cavern background, in-situ γ-ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0–3300 keV) varied from 596 Hz to 1355 Hz for unshielded measurements, corresponding to a total flux from the cavern walls of 1.9 ± 0.4 γ cm−2s−1. The resulting activity in the walls of the cavern can be characterised as 220 ± 60 Bq/kg of 40K, 29 ± 15 Bq/kg of 238U, and 13 ± 3 Bq/kg of 232Th.

Original languageEnglish (US)
Article number102391
JournalAstroparticle Physics
Volume116
DOIs
StatePublished - Mar 2020

Fingerprint

research facilities
rays
gamma rays
sodium iodides
particle interactions
xenon
shielding
cosmic rays
dark matter
attenuation
rocks
detectors
decay
liquids

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Cite this

@article{d6ea1c2d26dd45558bbd2a20041b6d00,
title = "Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility",
abstract = "Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from γ-rays emitted by 40K and the 238U and 232Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4850-foot level. In order to characterise the cavern background, in-situ γ-ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0–3300 keV) varied from 596 Hz to 1355 Hz for unshielded measurements, corresponding to a total flux from the cavern walls of 1.9 ± 0.4 γ cm−2s−1. The resulting activity in the walls of the cavern can be characterised as 220 ± 60 Bq/kg of 40K, 29 ± 15 Bq/kg of 238U, and 13 ± 3 Bq/kg of 232Th.",
author = "{(The LUX-ZEPLIN (LZ) Collaboration)} and Akerib, {D. S.} and Akerlof, {C. W.} and Alsum, {S. K.} and N. Angelides and Ara{\'u}jo, {H. M.} and Armstrong, {J. E.} and M. Arthurs and X. Bai and J. Balajthy and S. Balashov and A. Baxter and Bernard, {E. P.} and A. Biekert and Biesiadzinski, {T. P.} and Boast, {K. E.} and B. Boxer and P. Br{\'a}s and Buckley, {J. H.} and Bugaev, {V. V.} and S. Burdin and Busenitz, {J. K.} and C. Carels and Carlsmith, {D. L.} and Carmona-Benitez, {M. C.} and M. Cascella and C. Chan and A. Cole and A. Cottle and Cutter, {J. E.} and Dahl, {C. E.} and {de Viveiros}, L. and Dobson, {J. E.Y.} and E. Druszkiewicz and Edberg, {T. K.} and A. Fan and S. Fiorucci and H. Flaecher and T. Fruth and Gaitskell, {R. J.} and J. Genovesi and C. Ghag and Gilchriese, {M. G.D.} and S. Gokhale and {van der Grinten}, {M. G.D.} and Hall, {C. R.} and S. Hans and J. Harrison and Haselschwardt, {S. J.} and Hertel, {S. A.} and Hor, {J. Y.K.}",
year = "2020",
month = "3",
doi = "10.1016/j.astropartphys.2019.102391",
language = "English (US)",
volume = "116",
journal = "Astroparticle Physics",
issn = "0927-6505",
publisher = "Elsevier",

}

Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility. / (The LUX-ZEPLIN (LZ) Collaboration).

In: Astroparticle Physics, Vol. 116, 102391, 03.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility

AU - (The LUX-ZEPLIN (LZ) Collaboration)

AU - Akerib, D. S.

AU - Akerlof, C. W.

AU - Alsum, S. K.

AU - Angelides, N.

AU - Araújo, H. M.

AU - Armstrong, J. E.

AU - Arthurs, M.

AU - Bai, X.

AU - Balajthy, J.

AU - Balashov, S.

AU - Baxter, A.

AU - Bernard, E. P.

AU - Biekert, A.

AU - Biesiadzinski, T. P.

AU - Boast, K. E.

AU - Boxer, B.

AU - Brás, P.

AU - Buckley, J. H.

AU - Bugaev, V. V.

AU - Burdin, S.

AU - Busenitz, J. K.

AU - Carels, C.

AU - Carlsmith, D. L.

AU - Carmona-Benitez, M. C.

AU - Cascella, M.

AU - Chan, C.

AU - Cole, A.

AU - Cottle, A.

AU - Cutter, J. E.

AU - Dahl, C. E.

AU - de Viveiros, L.

AU - Dobson, J. E.Y.

AU - Druszkiewicz, E.

AU - Edberg, T. K.

AU - Fan, A.

AU - Fiorucci, S.

AU - Flaecher, H.

AU - Fruth, T.

AU - Gaitskell, R. J.

AU - Genovesi, J.

AU - Ghag, C.

AU - Gilchriese, M. G.D.

AU - Gokhale, S.

AU - van der Grinten, M. G.D.

AU - Hall, C. R.

AU - Hans, S.

AU - Harrison, J.

AU - Haselschwardt, S. J.

AU - Hertel, S. A.

AU - Hor, J. Y.K.

PY - 2020/3

Y1 - 2020/3

N2 - Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from γ-rays emitted by 40K and the 238U and 232Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4850-foot level. In order to characterise the cavern background, in-situ γ-ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0–3300 keV) varied from 596 Hz to 1355 Hz for unshielded measurements, corresponding to a total flux from the cavern walls of 1.9 ± 0.4 γ cm−2s−1. The resulting activity in the walls of the cavern can be characterised as 220 ± 60 Bq/kg of 40K, 29 ± 15 Bq/kg of 238U, and 13 ± 3 Bq/kg of 232Th.

AB - Deep underground environments are ideal for low background searches due to the attenuation of cosmic rays by passage through the earth. However, they are affected by backgrounds from γ-rays emitted by 40K and the 238U and 232Th decay chains in the surrounding rock. The LUX-ZEPLIN (LZ) experiment will search for dark matter particle interactions with a liquid xenon TPC located within the Davis campus at the Sanford Underground Research Facility, Lead, South Dakota, at the 4850-foot level. In order to characterise the cavern background, in-situ γ-ray measurements were taken with a sodium iodide detector in various locations and with lead shielding. The integral count rates (0–3300 keV) varied from 596 Hz to 1355 Hz for unshielded measurements, corresponding to a total flux from the cavern walls of 1.9 ± 0.4 γ cm−2s−1. The resulting activity in the walls of the cavern can be characterised as 220 ± 60 Bq/kg of 40K, 29 ± 15 Bq/kg of 238U, and 13 ± 3 Bq/kg of 232Th.

UR - http://www.scopus.com/inward/record.url?scp=85074200901&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85074200901&partnerID=8YFLogxK

U2 - 10.1016/j.astropartphys.2019.102391

DO - 10.1016/j.astropartphys.2019.102391

M3 - Article

AN - SCOPUS:85074200901

VL - 116

JO - Astroparticle Physics

JF - Astroparticle Physics

SN - 0927-6505

M1 - 102391

ER -