3 research outputs found
Neutron transmission measurements at nELBE
Neutron total cross sections are an important source of experimental data in the evaluation of neutron-induced cross sections. The sum of all neutron-induced reaction cross sections can be determined with a precision of a few per cent in a relative measurement. The neutron spectrum of the photoneutron source nELBE extends in the fast region from about 100 keV to 10 MeV and has favourable conditions for transmission measurements due to the low instantaneous flux of neutrons and low gamma-flash background. Several materials of interest (in part included in the CIELO evaluation or on the HPRL of OECD/NEA) have been investigated: 197Au [1, 2], natFe [2], natW [2], 238U, natPt, 4He, natO, natNe, natXe. For gaseous targets high pressure gas cells with flat end-caps have been built that hold up to 200 bar pressure. The experimental setup will be presented including results from several transmission experiments and the data analysis leading to the total cross sections will be discussed
Neutron Transmission Measurements at nELBE
Neutron total cross sections are an important source of experimental data in the evaluation of neutron induced cross sections. The sum of all neutron-induced reaction cross sections can be determined with a precision of a few percent in a relative measurement. The transmission is determined from the count rates of the neutron beam transmitted through a target sample relative to the count rate without sample and is independent of the neutron detection efficiency. The neutron spectrum of the photo neutron source nELBE extends in the fast region from about 100 keV to 10 MeV and has favourable conditions for transmission measurements due the low instantaneous flux of neutrons and low gamma-flash background. Several materials of interest (in part included in the CIELO evaluation or on the HPRL of OECD/NEA) have been investigated: 197Au, natFe, natW, 238U, natPt, 4He, natO, natNe, natXe. For gaseous targets high pressure gas cells have been built that hold up to 200 bar pressure. The experimental setup will be presented including results from several transmission experiments and the data analysis leading to the total cross sections will be discussed.JRC.G.2-Standards for Nuclear Safety, Security and Safeguard
Nucleosynthesis Reactions With The High-intensity Saraf-lilit Neutron Source
International audienceWe present a status report of recent neutron capture experiments performed with the mA-proton beam (1.92 MeV, 3 kW) of the Soreq Applied Research Accelerator Facility (SARAF) and the Liquid-Lithium Target (LiLiT). Experiments and preliminary results for (n) reactions on 36,38Ar, studied for the first time with 30-keV neutrons, on natKr, natCe and on radioactive targets 147Pm and 171Tm are described