Abstract
The Gamma Array for Inelastic Neutron Scattering (GAINS) operated at the Geel Linear Accelerator (GELINA) neutron source was used to measure ( n ,x n ) cross sections on 56,57 Fe reaching a level of uncertainty of the order of 5%. Serious difficulties arise in case of the 57 Fe isotope from the fact that the first excited level has an energy of only 14 keV and its decay could not be observed. Therefore a delicate combination of experimental and theoretical approaches have to be used to infer the inelastic cross section. The particularities of the two measurements are presented concentrating on the approaches allowing us to overcome specific problems in each case.
Highlights
Iron is undoubtedly one of the most important structural materials, largely used in the architecture of the large scale nuclear facilities
This paper describes the experiments performed on the major isotope 56Fe and on the minor one 57Fe emphasizing the specificities of each measurement, the experimental challenges and the solutions we applied in order to obtain high-quality results
For the case of 57Fe a interplay between our experimental results and the theory will be necessary in order to generate the total inelastic cross section: We will employ the well-known reaction codes TALYS [15] and EMPIRE [16] to fit the γ -production cross sections determined experimentally for the (n, n ) and (n, 2n) reaction channels
Summary
Iron is undoubtedly one of the most important structural materials, largely used in the architecture of the large scale nuclear facilities. It has four stable isotopes: 54Fe (natural abundance 5.85(11)%), 56Fe (91.75(11)%), 57Fe (2.12(3)%), and 58Fe (0.28(1)%) [1]. The program of measuring neutron inelastic cross section for structural materials of importance for the development of the fourth generation of nuclear reactors currently ongoing at the Geel Linear Accelerator (GELINA) [2,3,4,5,6,7,8,9,10] facility of the Joint Research Centre of the European Commission (EC-JRC) from Geel, Belgium included several experiments on iron isotopes. An investigation of the other minor isotope 54Fe is foreseen to start before the end of 2016
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