An Array of low-background He-3 proportional counters for the Sudbury neutrino observatory.

Amsbaugh, JF, Anaya, JM, Banar, JB, Peeters, S J M and et al, (2007) An Array of low-background He-3 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. ISSN 0168-9002

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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 He-3 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 He-4 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
Additional Information: Describes addition and running of a second detector to the SNO experiment. It is expected to significantly contribute to the most accurate measurement of the solar 8B neutrino flux. As neutron calibration analysis coordinator, I have directly contributed to the commissioning , running and understanding of this system.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Simon Peeters
Date Deposited: 06 Feb 2012 21:08
Last Modified: 30 Nov 2012 17:09
URI: http://srodev.sussex.ac.uk/id/eprint/29759
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