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Detection system for neutron β decay correlations in the UCNB and Nab experiments

Broussard, L. J. and Hickerson, K. P. (2017) Detection system for neutron β decay correlations in the UCNB and Nab experiments. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 849 . pp. 83-93. ISSN 0168-9002.

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We describe a detection system designed for precise measurements of angular correlations in neutron β decay. The system is based on thick, large area, highly segmented silicon detectors developed in collaboration with Micron Semiconductor, Ltd. The prototype system meets specifications for β electron detection with energy thresholds below 10 keV, energy resolution of ∼3 keV FWHM, and rise time of ∼50 ns with 19 of the 127 detector pixels instrumented. Using ultracold neutrons at the Los Alamos Neutron Science Center, we have demonstrated the coincident detection of β particles and recoil protons from neutron β decay. The fully instrumented detection system will be implemented in the UCNB and Nab experiments to determine the neutron β decay parameters B, a, and b.

Item Type:Article
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Hickerson, K. P.0000-0001-7647-119X
Additional Information:© 2016 Elsevier B.V. Received 9 July 2016, Revised 13 December 2016, Accepted 15 December 2016, Available online 19 December 2016. This paper has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this paper, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( We thank our UCNA collaborators from the California Institute of Technology for their contribution of the SCS magnetic spectrometer. This work was supported by the LDRD program of Los Alamos National Laboratory [project number 20110043DR], the National Science Foundation [contract number NSF PHY-1205833, 1307426], and the U.S. Department of Energy, Office of Science, Office of Nuclear Physics [contract numbers DE-AC52-06NA25396 under proposal 2017LANLEEDM, DE-AC05-00OR22725, DE-FG02-03ER41258, DE-FG02-97ER41042, DE-SC000-8107, DE-SC0014622] and the Office of Workforce Development for Teachers and Scientists (WDTS) under the Science Undergraduate Laboratory Internships Program (SULI).
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC05-00OR22725
Los Alamos National Laboratory20110043DR
Department of Energy (DOE)DE-AC52-06NA25396
Department of Energy (DOE)2017LANLEEDM
Department of Energy (DOE)DE-AC05-00OR22725
Department of Energy (DOE)DE-FG02-03ER41258
Department of Energy (DOE)DE-FG02-97ER41042
Department of Energy (DOE)DE-SC000-8107
Department of Energy (DOE)DE-SC0014622
Subject Keywords:Silicon detector; Neutron beta decay; Ultracold neutrons
Record Number:CaltechAUTHORS:20170417-141701252
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76614
Deposited By: Tony Diaz
Deposited On:17 Apr 2017 21:39
Last Modified:09 Mar 2020 13:18

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