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


Nilsson B., Adler J. -. , Andersson B. -. , Annand J. R. M. , AKKURT İ. , Boland M. J. , ...More

PHYSICAL REVIEW C, vol.75, no.1, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 75 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1103/physrevc.75.014007
  • Title of Journal : PHYSICAL REVIEW C

Abstract

A comprehensive set of He-4(gamma,n) absolute cross-section measurements was performed at MAX-lab in Lund, Sweden. Tagged photons from 23 < E-gamma < 70 MeV were directed toward a liquid He-4 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.