Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session E12: Minisymposium: Low Energy Neutrinos III: Neutrinoless Double-Beta Decay III & Detector Technology I
7:00 PM–10:30 PM,
Wednesday, November 29, 2023
Hilton Waikoloa Village
Room: Kona 5
Chair: Julieta Gruszko, University of North Carolina
Abstract: E12.00014 : Calculating The Cherenkov Radiation Emitted By Low-Energy Proton In Liquid Argon (LAr) Near UV Resonance (~106.6 nm) And Comparing With Argon Scintillation Light At 128 nm.*
10:15 PM–10:30 PM
Presenter:
Hasan R Rahman
(New Mexico State University)
Authors:
Hasan R Rahman
(New Mexico State University)
Matthew D Sievert
(New Mexico State University)
Vassili Papavassiliou
(New Mexico State University)
A new theoretical fit of the refractive index of LAr was performed using recent experimental data, which incorporates the physics of anomalous dispersion in the UV resonance for the first time. Using this fit, we integrate the Frank-Tamm (FT) formula to calculate the instantaneous Cherenkov angular distribution and yield of a proton with a given kinetic energy, as well as the integrated distribution and yield over its trajectory. We compare our results with those obtained using two other non-absorptive refractive index fits available in the literature. Because those fits diverge at the resonance, they significantly overestimate the yield.
Additionally, Cherenkov radiation is highly collimated and emitted instantaneously, whereas scintillation light is isotropic and emitted after a delay. This fundamental difference in their angular distribution (AD) sets the ground for differentiating the Cherenkov signal over the scintillation background, resulting in a substantial observational effect > 4σ for ∼ 500 MeV protons in LAr. This suggests that measurements of the collimated Cherenkov radiation could be used to measure the energy and direction of the incident protons more precisely in detector applications.
*This research is supported by a start-up grant awarded to Dr. Matthew Sievert from New Mexico State University.
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