A segmented high pressure gas target for (n, p) studies at TRIUMF

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Abstract

We have developed an (n,p) target chamber consisting of four target layers sandwich between five detector layers. The two] central targets are gas cells separated from the detector gas volume by thin windows. The two outer targets are solids. The chamber has been used with isotopic targets of 20Ne, 3He and 15N at the TRIUMF (n, p) facility. With the gas cells and gas box operated at 20 atm (20.3 bar) substantial target thickness can be achieved, while the contamination of (n, p) spectra from extraneous materials is minimized. The simultaneous accumulation of data from the two gas cells and two solid targets has the advantages of: 1) normalization by including targets of known cross section in the target stack and/or 2) obtaining the spectral shape of the incident neutron flux by choosing C and CH2 for the solid targets.

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Supported in part by Natural Sciences and Engineering Research Council of Canada.

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