| Popis: |
Linearly polarized γ-rays from the 3 H(p, γ ) 4 He reaction have been used to measure the relative neutron yield of the 2 H(γ, n)H reaction at θ n = 90° and at φ n = 0°, 45° and 90°. The 20,3 MeV γ-rays were monitored by a 12.7 diameter × 15.2 cm long NaI(Tl) crystal. A 6.3 cm diameter × 6.3 cm long NE230 scintillator was used both as a deuterium target and a proton detector, and a 30.5 cm diameter × 15.2 cm long NE213 scintillator was employed to detect the photoneutrons. The energy of the protons and the time of flight of the neutrons from the 2 H(γ, n)H reaction were measured in coincidence and the events recorded in a bidimensional spectrum. The ratio a b of the coefficients of the angular distribution of the 2 H(γ, n)H reaction and the quantity Σ(90°) were obtained from the ratio of the photoneutron yields at φ n = 90° and 0° and found to be a / b = 0.063−0.076 ± 0.036 and Σ = 0.913−0.925 ± 0.051. |
