The neutron facility at NCSR ‘Demokritos’ and neutron activation research activities of NTUA

Abstract

Abstract At the 5.5 MV Tandem T11/25 Accelerator Laboratory of NCSR “Demokritos” quasi-monoenergetic neutron beams can be produced in the energy ranges ∼15–21 MeV by means of the 3H(d,n)4He reaction, ∼4–11 MeV via the 2H(d,n)3He reaction, ∼2.0–5.3 MeV using the 3H(p,n)3He reaction and ∼120–650 keV via the 7Li(p,n)7Be reaction. The maximum flux has been determined to be of the order of 10 5 – 10 6 n/cm 2 s $10^{5}\text{--}10^{6}\text{ n/cm}^{2}\text{s}$ , implementing reference reactions, while the flux variation of the neutron beam is monitored using a BF3 detector and a BC501A scintillator. The neutron beams have been characterized using the multiple foil activation technique as well as extensive simulations and have been used for cross section measurements of neutron induced reactions implementing again the activation technique.