Nuclear data needs and standard spectra for the measurements and analyses of D-Li neutron spectra

An experiment is in preparation to set up two standard spectra for D-Li neutron source dosimetry. These spectra are produced by 50 MeV D+ falling on a thick Li target and the spectra emitted under 00 and 200 will be taken. These spectra will be measured by T.0.F. techniques and activation detectors will be irradiated at the same position of the T.O.F. detectors for calibration. With calibrated detectors, spectra in the vicinity of target will be measured. A detector set is proposed and preliminary calculations are executed to find out which nuclear data are needed and in which energy region, to be able to analyze the measured reaction rates. The needed improvement of these data is discussed; after the execution of the measurements data needs and improvements will be revised. (author)