Neutrons and Argon in the DUNE and ARTIE Experiments
DUNE & ARTIE:
ARGON TRANSPARENCY TO NEUTRONS
LEONARDO OLIVEIRA | LIP 2019
Fig. 1: Illustration of DUNE setup
2
Liquid-Argon Time Projection Chambers
Fig. 2: Modified illustration of DUNE setup
3
LIQUID-ARGON TIME PROJECTION CHAMBER
Fig. 3: Animation of LArTPC mechanism
Fig. 4: CERN scientist inside the unfinished ProtoDUNE LArTPC
4
PULSED NEUTRON SOURCE CALIBRATION
Pulsed Neutron Source (PNS) shoots neutrons
into LArTPC
Elastic scattering distributes neutrons
throughout volume
Neutron capture reaction with Argon atom
Gamma rays provide current profile of the
detector
PNS calibration relies on large scattering
length for ⁴⁰Ar
Fig. 5: Illustration
of PNS calibration mechanism
5
SCATTERING LENGTH
Depends on cross-section (isotope-specific)
Measured only once for 40-Ar (Winters, 1991)
Focused on resonance peaks
Not enough precision for anti-resonance peak
Anti-resonance peak at 57 keV
Predicted by theory, but not yet measured
Integral for PNS calibration to actually work!
Fig. 6: Total cross section data for ⁴⁰
Ar
6
ARTIE
A
rgon
R
esonant
T
ransport
I
nteraction
E
xperiment
Seeks to confirm scattering length
for natural Liquid Argon at the
40 – 70 keV range
Fig. 7: Illustration of ARTIE setup
7
CURRENT WORK
Simulations using Geant4
Time-energy reconstruction
Effect of 150ns noise from pulse
Fig. 8: Plots of
Initial Energy
(dashed red) and
Reconstructed Energy
(solid blue)
8
CURRENT WORK
Fig. 9: Plot of neutron hits at counter
Fig. 10: Plot of radial distribution of hits
THANK YOU
QUESTIONS?
Detailed overview of experiments like DUNE and ARTIE focusing on the use of liquid argon time projection chambers for studying neutron interactions. Discussions include Pulsed Neutron Source calibration, scattering length measurements, ARTIE setup for resonant transport interactions, and current simulation work using Geant4 for energy reconstruction and noise analysis.
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Presentation Transcript
DUNE & ARTIE: ARGON TRANSPARENCY TO NEUTRONS LEONARDO OLIVEIRA | LIP 2019
Liquid-Argon Time Projection Chambers Fig. 2: Modified illustration of DUNE setup 3
LIQUID-ARGON TIME PROJECTION CHAMBER Fig. 4: CERN scientist inside the unfinished ProtoDUNE LArTPC Fig. 3: Animation of LArTPC mechanism 4
PULSED NEUTRON SOURCE CALIBRATION Pulsed Neutron Source (PNS) shoots neutrons into LArTPC Elastic scattering distributes neutrons throughout volume Neutron capture reaction with Argon atom Gamma rays provide current profile of the detector PNS calibration relies on large scattering length for Ar Fig. 5: Illustration of PNS calibration mechanism 5
SCATTERING LENGTH Depends on cross-section (isotope-specific) Measured only once for 40-Ar (Winters, 1991) Focused on resonance peaks Not enough precision for anti-resonance peak Anti-resonance peak at 57 keV Predicted by theory, but not yet measured Integral for PNS calibration to actually work! Fig. 6: Total cross section data for Ar 6
ARTIE A rgon R esonant T ransport I nteraction E xperiment Seeks to confirm scattering length for natural Liquid Argon at the 40 70 keV range Fig. 7: Illustration of ARTIE setup 7
CURRENT WORK Simulations using Geant4 Time-energy reconstruction Effect of 150ns noise from pulse Fig. 8: Plots of Initial Energy (dashed red) and Reconstructed Energy (solid blue) 8
CURRENT WORK Fig. 9: Plot of neutron hits at counter Fig. 10: Plot of radial distribution of hits
THANK YOU QUESTIONS?
