Near-threshold measurement of the He-4(gamma,n) reaction

Research output: Contribution to journalArticle


A near-threshold He-4(gamma, n) cross-section measurement has been performed at MAX-lab. Tagged photons from 23 < Ey < 42 MeV were directed toward a liquid He-4 target, and neutrons were detected by time-of-flight in two liquid-scintillator arrays. Seven-point angular distributions were measured for eight photon energies. The results are compared to experimental data measured at comparable energies and Recoil-Corrected Continuum Shell Model, Resonating Group Method, and recent Hyperspherical-Harmonic Expansion calculations. The angle-integrated cross-section data are peaked at a photon energy of about 28 MeV, in disagreement with the value recommended by Calarco, Berman, and Donnelly in 1983.


  • Björn Nilsson
  • BE Andersson
  • JRM Annand
  • I Akkurt
  • Mark Boland
  • GI Crawford
  • Kurt Hansen
  • PD Harty
  • DG Ireland
  • Martin Karlsson
  • Magnus Lundin
  • JC McGeorge
  • GJ Miller
  • H Ruijter
  • Anders Sandell
  • DA Sims
  • D Watts
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • time-of-flight, tagged photons, n), He-4(gamma, cross section
Original languageEnglish
Pages (from-to)65-71
JournalPhysics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-4
Publication statusPublished - 2005
Publication categoryResearch

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Kevin Fissum


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