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Doppler broadening of neutron-induced resonances using ab initio phonon spectrum
CEA, DEN Cadarache, Lab Phys Studies, F-13108 St Paul Les Durance, France.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
CEA, DEN Cadarache, Lab Phys Studies, F-13108 St Paul Les Durance, France.
2018 (English)In: The European Physical Journal Plus, ISSN 2190-5444, E-ISSN 2190-5444, Vol. 133, no 5, article id 177Article in journal (Refereed) Published
Abstract [en]

Neutron resonances observed in neutron cross section data can only be compared with their theoretical analogues after a correct broadening of the resonance widths. This broadening is usually carried out by two different theoretical models, namely the Free Gas Model and the Crystal Lattice Model, which, however, are only applicable under certain assumptions. Here, we use neutron transmission experiments on UO2 samples at T = 23.7 K and T = 293.7 K, to investigate the limitations of these models when an ab initio phonon spectrum is introduced in the calculations. Comparisons of the experimental and theoretical transmissions highlight the underestimation of the energy transferred at low temperature and its impact on the accurate determination of the radiation widths Gamma(gamma lambda) of the U-238 resonances lambda. The observed deficiency of the model represents an experimental evidence that the Debye-Waller factor is not correctly calculated at low temperature near the Neel temperature (T-N = 30.8 K).

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2018. Vol. 133, no 5, article id 177
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-356455DOI: 10.1140/epjp/i2018-12009-yISI: 000432653000001OAI: oai:DiVA.org:uu-356455DiVA, id: diva2:1236111
Available from: 2018-07-31 Created: 2018-07-31 Last updated: 2018-08-13Bibliographically approved

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