Measurements of Differential Thick Target Neutron Yields and Be Production in the Li, Be(d, n) Reactions for 25MeV Deuterons

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Neutron emission spectra and production rates of radioactive nuclide 7Be in the (d,n) reactions on thick lithium and 9Be targets have been measured for 25 MeV deuterons at the Tohoku University AVF cyclotron (K=110) facility to provide basic data for the design of the intense neutron source, International Fusion Reactor Material Irradiation Test Facility (IFMIF).Neutron spectra were measured with the time-of-flight method at ten laboratory angles between 0° and 90° by using a beam swinger system. Data were obtained down to ∼1 MeV from the highest energy, using a two-gain NE213 detector system. Induced radioactivity of 7Be was measured by detecting the 478 keV γ-rays from 7Be with a pure Ge detector.The experimental results of neutron spectra revealed clearly the entire shape of the neutron emission spectrum and the angular dependence including so called “high energy tail” extending up to ∼40 MeV. The present data at 0° are in reasonable agreement with corresponding value by Lone et al. at 23 MeV above ∼5 MeV, but show large discrepancy in the lower energy region. The results of 7Be production for both nuclei were much larger than expected by the calculation with a recent code IRAC.
社団法人日本原子力学会の論文
2004-04-25