Bulletin of the American Physical Society
Spring 2023 Meeting of the APS New England Section
Volume 68, Number 4
Friday–Saturday, March 17–18, 2023; Amherst College, Amherst, Massachusetts
Session L03: General Physics I
9:30 AM–10:10 AM,
Saturday, March 18, 2023
Amherst College
Room: E210
Chair: Jonathan Friedman, Amherst College
Abstract: L03.00001 : Towards a Cluster-wise Energy Calibration in EXO-200 from Pair Producing Gamma Rays*
9:30 AM–9:50 AM
Presenter:
Seth P Thibado
(University of Massachusetts Amherst)
Authors:
Seth P Thibado
(University of Massachusetts Amherst)
Andrea Pocar
(UMass, Amherst)
Collaboration:
On Behalf of the EXO-200 Collaboration
A second part of this study is to measure the beta spectrum of Xe-137 beta decay to the lowest excited state of Cs-137 (Jπ = 5/2+). This decay is followed by a prompt 455 keV gamma de-excitation, which together with the beta electron, produces spatially distributed energy depositions in the EXO-200 TPC, which are reconstructed as “multi-site” events. This study requires a dedicated energy calibration on individual charge clusters of multi-site events to extract the beta energy alone. This talk will discuss the use of pair-producing gamma ray events present in EXO-200 calibration data and reproduced in simulations to identify a controlled set of beta clusters in multi-set events over a range of energies.
*NSF
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