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Title: Measurement of Scintillation and Ionization Yield and Scintillation Pulse Shape from Nuclear Recoils in Liquid Argon

Journal Article · · Physical Review. D, Particles, Fields, Gravitation and Cosmology
 [1]
  1. Princeton Univ., NJ (United States). et al.

We have measured the scintillation and ionization yield of recoiling nuclei in liquid argon as a function of applied electric field by exposing a dual-phase liquid argon time projection chamber (LAr-TPC) to a low energy pulsed narrow band neutron beam produced at the Notre Dame Institute for Structure and Nuclear Astrophysics. Liquid scintillation counters were arranged to detect and identify neutrons scattered in the TPC and to select the energy of the recoiling nuclei. We report measurements of the scintillation yields for nuclear recoils with energies from 10.3 to 57.3 keV and for median applied electric fields from 0 to 970 V / cm . For the ionization yields, we report measurements from 16.9 to 57.3 keV and for electric fields from 96.4 to 486 V / cm . We also report the observation of an anticorrelation between scintillation and ionization from nuclear recoils, which is similar to the anticorrelation between scintillation and ionization from electron recoils. Assuming that the energy loss partitions into excitons and ion pairs from 83 m Kr internal conversion electrons is comparable to that from 207 Bi conversion electrons, we obtained the numbers of excitons ( N ex ) and ion pairs ( N i ) and their ratio ( N ex / N i ) produced by nuclear recoils from 16.9 to 57.3 keV. Motivated by arguments suggesting direction sensitivity in LAr-TPC signals due to columnar recombination, a comparison of the light and charge yield of recoils parallel and perpendicular to the applied electric field is presented for the first time.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
SCENE Collaboration
Grant/Contract Number:
AC02-07CH11359; AC52-07NA27344
OSTI ID:
1226279
Alternate ID(s):
OSTI ID: 1182833; OSTI ID: 1378529
Report Number(s):
FERMILAB-PUB-14-204-AE-E; LLNL-JRNL-737375; arXiv eprint number arXiv:1406.4825
Journal Information:
Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 09; ISSN 1550-7998
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 78 works
Citation information provided by
Web of Science

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Cited By (12)

DarkSide-20k: A 20 tonne two-phase LAr TPC for direct dark matter detection at LNGS journal March 2018
Neutrino–nucleus cross sections for oscillation experiments journal December 2017
Measurement of the liquid argon energy response to nuclear and electronic recoils text January 2018
Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold journal July 2015
Measurement of the scintillation efficiency for nuclear recoils in liquid argon under electric fields up to 3 kV / cm journal August 2019
Dark Matter Directionality Revisited with a High Pressure Xenon Gas Detector text January 2015
Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold text January 2015
Readout strategies for directional dark matter detection beyond the neutrino background text January 2015
CALIS - a CALibration Insertion System for the DarkSide-50 dark matter search experiment text January 2016
Simulation of argon response and light detection in the DarkSide-50 dual phase TPC text January 2017
DarkSide-20k: A 20 Tonne Two-Phase LAr TPC for Direct Dark Matter Detection at LNGS text January 2017
A Dark Matter Hurricane: Measuring the S1 Stream with Dark Matter Detectors text January 2018