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Measurements of neutron transmission are performed at the pulsed neutron source GELINA (Geel Linear Accelerator) of the JRC Institute of Reference Materials and Measurements in Belgium. This white neutron source is one of the world's best as it possesses an excellent energy resolution and good intensity, which offer the possibility of obtaining high quality neutron data. This lecture presents typical characteristics of the time-of-flight (TOF) measurements performed here.

The neutron transmission through a sample is connected directly with the total neutron cross section of the isotope. The precision of the experimental data is important for the exact determination of the neutron resonance parameters, which are relevant in applications like astrophysics and nuclear reactor design. The knowledge of the average nuclear properties, like the strength function, is desirable in nuclear reaction theory for comparison with predictions of different optical models. High quality of the transmission data is assured by precise measurements and data analysis. The latter is done carefully by using sophisticated computer codes. The resolution function of the neutron source and the resonance Doppler broadening are objects of special attention.

This lecture presents typical examples of the neutron transmission measurements at GELINA, the main direction of the data applications and an overview of the future investigations in the field.

Additional information

Authors: BRUSEGAN A, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: An oral report given at: XIV International School on Nuclear Physics, Neutron Physics and Nuclear Energy Organised by: Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences Held at: Varna (BG), 25-30 Sept 2001
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