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Measurement of the He-4(gamma,n) reaction from 23 gamma <70 MeV

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Summary, in English

A comprehensive set of 4He(,n) absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from 23<E<70 MeV were directed toward a liquid 4He target, and neutrons were identified using pulse-shape discrimination and the time-of-flight technique in two liquid-scintillator detector arrays. Seven-point angular distributions have been measured for 14 photon energies. The results have been subjected to complementary transition-coefficient and Legendre-coefficient analyses. The results are also compared to experimental data measured at comparable photon energies as well as recoil-corrected continuum shell-model, resonating group method, and effective interaction hyperspherical-harmonic expansion calculations. For photon energies below 29 MeV, the angle-integrated data are significantly larger than the values recommended by Calarco, Berman, and Donnelly in 1983.

Publishing year

2007

Language

English

Publication/Series

Physical Review C (Nuclear Physics)

Volume

75

Document type

Journal article

Publisher

American Physical Society

Topic

  • Natural Sciences
  • Physical Sciences
  • Subatomic Physics

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: 0556-2813