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.

• Författare: 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
• Avdelning/ar: Kärnfysik; MAX IV-laboratoriet; Fysiska institutionen; Medicinsk strålningsfysik, Lund
• Publiceringsår: 2005
• Språk: Engelska
• Sidor: 65-71
• Publikation/Tidskrift/Serie: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volym: 626
• Issue: 1-4
• Länkar: http://dx.doi.org/10.1016/j.physletb.2005.08.081
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Subatomic Physics
• Nyckelord: time-of-flight; tagged photons; n); He-4(gamma; cross section
• Status: Published
• Projekt: Charge-Symmetry Breaking in the Giant Dipole Resonance Region; Nucleon Knockout with Electromagnetic Beams
• Forskningsgrupp: Photonuclear Research
• ISBN/ISSN/Övrigt: ISSN: 0370-2693