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Calibration of An Aerogel Counter of Index 1.1 at the Bevalac

Rasmussen, I. L. and Laurence, S. and Buffington, A. and Schindler, S. M. (1983) Calibration of An Aerogel Counter of Index 1.1 at the Bevalac. In: 18th International Cosmic Ray Conference, Bangalore, India, August 22 to September 3, 1983. Vol.9. Tata Institute of Fundamental Research , Bombay, India, pp. 77-80. http://resolver.caltech.edu/CaltechAUTHORS:20140423-134315709

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Abstract

A Cerenkov counter consisting of a mosaic with 48 aerogel pieces having refractive indices n ≈ 1.1 has been exposed to sea level muons, and to a beam of relativistic ^(55)Mn at the Berkeley Bevalac. The counter is 6 cm thick and approximately 60 cm in diameter, and is viewed by twelve 12.7 cm diameter photomultipliers. A relativistic muon produces typically 23 ± 4 photoelectrons. The light yield has been mapped as a function of position and has an r.m.s. variation less than 1%/cm. Analysis of the light yield indicates that absorption is important at short wavelengths. The calibration shows that the light yield and uniformity of the counter suffice to determine particle velocity in the γ range from 2.4 to 3.1 precisely enough to achieve a mass resolution of 0.3 a.m.u. for the instrument described in paper OG2-7 of this conference.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/abs/1983ICRC....8...77RADSArticle
Contact Email Address:dmiles@caltech.edu
Additional Information:Partially supported by NASA grant NGR 05-002-160.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANGR 05-002-160
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1983-09
Record Number:CaltechAUTHORS:20140423-134315709
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140423-134315709
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45158
Collection:CaltechAUTHORS
Deposited By: SWORD User
Deposited On:24 Apr 2014 22:58
Last Modified:24 Apr 2014 22:58

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