Lundin, M; Fissum, KG; Nilsson, B; Ruijter, H; Sims, DA; Adler, JO; Andersson, BE; Ireland, DG; Isaksson, L; Karlsson, M; McGeorge, JC; Miller, GJ; Schroder, B; Watts, D; AKKURT, İskender; Crawford, GI; Sandell, A; Annand, JRM; Boland, MJ; Harty, PD; Hansen, K
Description:
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. (c) 2005 Elsevier B.V. All rights reserved.