A helium gas scintillator active target for photoreaction measurements


Al Jebali R., Annand J. R. M. , Adler J., AKKURT İ. , Buchanan E., Brudvik J., ...More

EUROPEAN PHYSICAL JOURNAL A, vol.51, no.10, 2015 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 51 Issue: 10
  • Publication Date: 2015
  • Doi Number: 10.1140/epja/i2015-15123-y
  • Title of Journal : EUROPEAN PHYSICAL JOURNAL A

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 g/cm(3) at an operating pressure of 2MPa. Scintillations are read out by photomultiplier tubes and the addition of small amounts of 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 a timing resolution of around 1 ns 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 He-4, 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.