Observables for recoil identification in high-definition Gas Time Projection Chambers

Ghrear, M.; Vahsen, S. E.; Deaconu, C.

doi:10.1088/1475-7516/2021/10/005

Title: Observables for recoil identification in high-definition Gas Time Projection Chambers

Journal Article · Tue Oct 05 00:00:00 EDT 2021 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2021/10/005· OSTI ID:1979337

Ghrear, M. ^[1]; Vahsen, S. E. ^[1]; Deaconu, C. ^[2]

University of Hawaii, Honolulu, HI (United States)
University of Chicago, IL (United States). Kavli Institute for Cosmological Physics (KICP)

Directional detection of nuclear recoils is broadly desirable in nuclear and particle physics. At low recoil energies, this capability may be used to confirm the cosmological origin of a dark matter signal, to penetrate the so-called neutrino floor, or to distinguish between different neutrino sources. Gas Time Projection Chambers (TPCs) can enable directional recoil detection if the readout granularity is sufficiently high, as is the case when micro-pattern gaseous detectors (MPGDs) are utilized. A key challenge in such detectors is identifying and rejecting background electron recoil events caused by gamma rays from radioactive contaminants in the detector materials and the environment. We define new observables that can distinguish electron and nuclear recoils, even at keV-scale energies, based on the simulated ionization's topology. We perform a simulation study that shows these observables outperform the traditionally used discriminant, dE/dx, by up to three orders of magnitude. Furthermore, these new observables work well even at ionization energies well below 10keV and remain robust even in the regime where directionality fails.

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Research Organization:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010504

OSTI ID:: 1979337

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 10; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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