Sökning: id:"swepub:oai:DiVA.org:uu-356455" >
Doppler broadening ...
-
Noguere, G.CEA, DEN Cadarache, Lab Phys Studies, F-13108 St Paul Les Durance, France
(författare)
Doppler broadening of neutron-induced resonances using ab initio phonon spectrum
- Artikel/kapitelEngelska2018
Förlag, utgivningsår, omfång ...
-
2018-05-08
-
Springer Berlin/Heidelberg,2018
-
printrdacarrier
Nummerbeteckningar
-
LIBRIS-ID:oai:DiVA.org:uu-356455
-
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356455URI
-
https://doi.org/10.1140/epjp/i2018-12009-yDOI
Kompletterande språkuppgifter
-
Språk:engelska
-
Sammanfattning på:engelska
Ingår i deldatabas
Klassifikation
-
Ämneskategori:ref swepub-contenttype
-
Ämneskategori:art swepub-publicationtype
Anmärkningar
-
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).
Ämnesord och genrebeteckningar
Biuppslag (personer, institutioner, konferenser, titlar ...)
-
Maldonado, PabloUppsala universitet,Materialteori(Swepub:uu)pabpa329
(författare)
-
De Saint Jean, C.CEA, DEN Cadarache, Lab Phys Studies, F-13108 St Paul Les Durance, France
(författare)
-
CEA, DEN Cadarache, Lab Phys Studies, F-13108 St Paul Les Durance, FranceMaterialteori
(creator_code:org_t)
Sammanhörande titlar
-
Ingår i:The European Physical Journal Plus: Springer Berlin/Heidelberg133:52190-5444
Internetlänk
Hitta via bibliotek
Till lärosätets databas