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

Summary, in English

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.

• Author: Björn Nilsson; Jan-Olof Adler; BE Andersson; JRM Annand; I Akkurt; Mark Boland; GI Crawford; Kevin Fissum; Kurt Hansen; PD Harty; DG Ireland; Lennart Isaksson; Martin Karlsson; Magnus Lundin; JC McGeorge; GJ Miller; H Ruijter; Anders Sandell; Bent Schröder; DA Sims; D Watts
• Department/s: Nuclear physics; MAX IV Laboratory; Department of Physics; Medical Radiation Physics, Lund
• Publishing year: 2005
• Language: English
• Pages: 65-71
• Publication/Series: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 626
• Issue: 1-4
• Links: http://dx.doi.org/10.1016/j.physletb.2005.08.081
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Keywords: time-of-flight; tagged photons; n); He-4(gamma; cross section
• Status: Published
• Project: Charge-Symmetry Breaking in the Giant Dipole Resonance Region; Nucleon Knockout with Electromagnetic Beams
• Research group: Photonuclear Research
• ISBN/ISSN/Other: ISSN: 0370-2693