Scintillation light from cosmic-ray muons in liquid argon

Denver Whittington, S. Mufson, B. Howard

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

This paper reports the results of an experiment to directly measure the time-resolved scintillation signal from the passage of cosmic-ray muons through liquid argon. Scintillation light from these muons is of value to studies of weakly-interacting particles in neutrino experiments and dark matter searches. The experiment was carried out at the TallBo dewar facility at Fermilab using prototype light guide detectors and electronics developed for the Deep Underground Neutrino Experiment. Two models are presented for the time structure of the scintillation light, a phenomenological model and a composite model. Both models find τT = 1.52 μs for the decay time constant of the Ar2 triplet state. These models also show that the identification of the ''early'' light fraction in the phenomenological model, FE ≈ 25% of the signal, with the total light from singlet decays is an underestimate. The total fraction of singlet light is FS ≈ 36%, where the increase over FE is from singlet light emitted by the wavelength shifter through processes with long decay constants. The models were further used to compute the experimental particle identification parameter Fprompt, the fraction of light coming in a short time window after the trigger compared with the light in the total recorded waveform. The models reproduce quite well the typical experimental value ∼0.3 found by dark matter and double β-decay experiments, which suggests this parameter provides a robust metric for discriminating electrons and muons from more heavily ionizing particles.

Original languageEnglish (US)
Article numberP05016
JournalJournal of Instrumentation
Volume11
Issue number5
DOIs
StatePublished - May 20 2016

Fingerprint

Scintillation
Cosmic rays
Cosmic Rays
scintillation
Argon
muons
cosmic rays
argon
Liquid
Liquids
liquids
Decay
Experiment
decay
Dark Matter
Neutrinos
Model
Experiments
dark matter
Identification (control systems)

Keywords

  • APDs
  • CCDs
  • double-phase)
  • EBCCDs
  • EMCCDs etc)
  • G-APDs
  • ionization
  • Ionization and excitation processes
  • Neutrino detectors
  • Noble liquid detectors (scintillation
  • Photon detectors for UV
  • Si-PMTs
  • visible and IR photons (solid-state) (PIN diodes

ASJC Scopus subject areas

  • Instrumentation
  • Mathematical Physics

Cite this

Scintillation light from cosmic-ray muons in liquid argon. / Whittington, Denver; Mufson, S.; Howard, B.

In: Journal of Instrumentation, Vol. 11, No. 5, P05016, 20.05.2016.

Research output: Contribution to journalArticle

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abstract = "This paper reports the results of an experiment to directly measure the time-resolved scintillation signal from the passage of cosmic-ray muons through liquid argon. Scintillation light from these muons is of value to studies of weakly-interacting particles in neutrino experiments and dark matter searches. The experiment was carried out at the TallBo dewar facility at Fermilab using prototype light guide detectors and electronics developed for the Deep Underground Neutrino Experiment. Two models are presented for the time structure of the scintillation light, a phenomenological model and a composite model. Both models find τT = 1.52 μs for the decay time constant of the Ar2 ∗ triplet state. These models also show that the identification of the ''early'' light fraction in the phenomenological model, FE ≈ 25{\%} of the signal, with the total light from singlet decays is an underestimate. The total fraction of singlet light is FS ≈ 36{\%}, where the increase over FE is from singlet light emitted by the wavelength shifter through processes with long decay constants. The models were further used to compute the experimental particle identification parameter Fprompt, the fraction of light coming in a short time window after the trigger compared with the light in the total recorded waveform. The models reproduce quite well the typical experimental value ∼0.3 found by dark matter and double β-decay experiments, which suggests this parameter provides a robust metric for discriminating electrons and muons from more heavily ionizing particles.",
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AB - This paper reports the results of an experiment to directly measure the time-resolved scintillation signal from the passage of cosmic-ray muons through liquid argon. Scintillation light from these muons is of value to studies of weakly-interacting particles in neutrino experiments and dark matter searches. The experiment was carried out at the TallBo dewar facility at Fermilab using prototype light guide detectors and electronics developed for the Deep Underground Neutrino Experiment. Two models are presented for the time structure of the scintillation light, a phenomenological model and a composite model. Both models find τT = 1.52 μs for the decay time constant of the Ar2 ∗ triplet state. These models also show that the identification of the ''early'' light fraction in the phenomenological model, FE ≈ 25% of the signal, with the total light from singlet decays is an underestimate. The total fraction of singlet light is FS ≈ 36%, where the increase over FE is from singlet light emitted by the wavelength shifter through processes with long decay constants. The models were further used to compute the experimental particle identification parameter Fprompt, the fraction of light coming in a short time window after the trigger compared with the light in the total recorded waveform. The models reproduce quite well the typical experimental value ∼0.3 found by dark matter and double β-decay experiments, which suggests this parameter provides a robust metric for discriminating electrons and muons from more heavily ionizing particles.

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