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An Array of low-background 3He proportional counters for the Sudbury Neutrino Observatory

Amsbaugh, J. F. and Kormos, Laura L. and O'Keeffe, Helen (2007) An Array of low-background 3He proportional counters for the Sudbury Neutrino Observatory. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 579 (3). pp. 1054-1080.

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Abstract

An array of Neutral-Current Detectors (NCDs) has been built in order to make a unique measurement of the total active flux of solar neutrinos in the Sudbury Neutrino Observatory (SNO). Data in the third phase of the SNO experiment were collected between November 2004 and 2006, after the NCD array was added to improve the neutral-current sensitivity of the SNO detector. This array consisted of 36 strings of proportional counters filled with a mixture of 3He and CF4 gas capable of detecting the neutrons liberated by the neutrino-deuteron neutral-current reaction in the D2O, and four strings filled with a mixture of 4He and CF4 gas for background measurements. The proportional counter diameter is 5 cm. The total deployed array length was 398 m. The SNO NCD array is the lowest-radioactivity large array of proportional counters ever produced. This article describes the design, construction, deployment, and characterization of the NCD array, discusses the electronics and data acquisition system, and considers event signatures and backgrounds.

Item Type: Article
Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Uncontrolled Keywords: 3He proportional counter ; Solar neutrinos ; Neutral current ; Low-radioactivity materials ; Neutron detection ; Radon-daughter mitigation ; Chemical-vapor deposition
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 18652
Deposited By: ep_ss_importer
Deposited On: 29 Oct 2008 16:58
Refereed?: Yes
Published?: Published
Last Modified: 10 Jun 2014 14:22
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/18652

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