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20 April 2024

» arxiv » 1503.5545

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A Helium Gas-Scintillator Active Target for Photoreaction Measurements
R. Al Jebali ; J.R.M. Annand ; J.-O. Adler ; I. Akkurt ; E. Buchanan ; J. Brudvik ; K. Fissum ; S. Gardner ; D.J. Hamilton ; K. Hansen ; L. Isaksson ; K. Livingston ; M. Lundin ; J.C. McGeorge ; I.J.D. MacGregor ; R. MacRae ; D.G. Middleton ; A.J.H. Reiter ; G. Rosner ; B. Schröder ; J. Sjögren ; D. Sokhan ; B. Strandberg ;
Date:	18 Mar 2015
Abstract:	A multi-cell He gas-scintillator active target, designed for the measurement of photoreaction cross sections, is described. The target has four main chambers, giving an overall thickness of 0.103 $mathrm{g/cm^{2}}$ at an operating pressure of 2 MPa. Scintillations are read out by photomultiplier tubes and the addition of small amounts of $mathrm{N}_{2}$ to the He, to shift the scintillation emission from UV to visible, is discussed. First results of measurements at the MAX IV Laboratory tagged-photon facility show that the target has good timing resolution and can cope well with a high-flux photon beam. The determination of reaction cross sections from target yields relies on a Monte Carlo simulation, which considers scintillation light transport, photodisintegration processes in $^{4}mathrm{He}$, background photon interactions in target windows and interactions of the reaction-product particles in the gas and target container. The predictions of this simulation are compared to the measured target response.
Source:	arXiv, 1503.5545
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