Abstract
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.
Highlights
The neutron total cross section is the sum of the neutron induced partial cross sections for all open reaction channels, i.e. elastic and inelastic scattering, radiative capture, etc
The neutron total cross section can be determined in a transmission experiment, which allows a high precision of a few percent as the measurement is independent of the neutron detection efficiency
At the nELBE time of flight facility at Helmholtz-Zentrum Dresden - Rossendorf (HZDR) several transmission measurements have been conducted to determine the total neutron cross section in the fast energy range starting at 100 keV up to about 10 MeV
Summary
The neutron total cross section is the sum of the neutron induced partial cross sections for all open reaction channels, i.e. elastic and inelastic scattering, radiative capture, etc. It is an important experimental input for the evaluation of neutron-induced cross sections. The neutron total cross section can be determined in a transmission experiment, which allows a high precision of a few percent as the measurement is independent of the neutron detection efficiency. At the nELBE time of flight facility at Helmholtz-Zentrum Dresden - Rossendorf (HZDR) several transmission measurements have been conducted to determine the total neutron cross section in the fast energy range starting at 100 keV up to about 10 MeV. Precise data for the first resonance at 440 keV are required to improve the current data evaluation [11]
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