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Neutrons produced by the 7Li(p, n)7Be reaction close to the reaction threshold are widely used to measure the cross section of s-process nucleosynthesis reactions. While experiments have been performed so far with Van de Graaff accelerators, the use of RFaccelerators with higher intensities is planned to enable investigations on radioactive isotopes. In parallel, high-power Li targets for the production of high-intensity neutrons at stellar energies are developed at Goethe University (Frankfurt, Germany) and SARAF (Soreq NRC, Israel). However, the use of such setups poses severe challenges for the measurement of the proton beam intensity or the neutron fluence. In order to develop appropriate methods, we studied in detail the neutron energy distribution and intensity produced by the thick-target 7Li(p, n)7Be reaction and compared them to state-of-the-art simulation codes. Measurements were performed with the bunched and chopped proton beam at the Van de Graaff facility of the Joint Research Commission-Institute for Reference Materials and Measurements using the time-of-flight (TOF) technique with thin (1/8′′) and thick (1′′) detectors. The importance of detailed simulations ofthe detector structure and geometry for the conversion of TOF to a neutron energy is stressed. The measured neutron spectra are consistent with those previously reported and agree well with Monte Carlo simulations that include experimentally determined 7Li(p, n) cross sections, two-body kinematics and proton energy loss in the Li-target.JRC.G.2-Standards for Nuclear Safety, Security and Safeguar

Neutron Energy Spectra and Yields from the7Li(p,n) Reaction for Nuclear Astrophysics

Neutron Energy Spectra and Yields from the⁷Li(p,n) Reaction for Nuclear Astrophysics