dc.creator | Armaducci, S. | es |
dc.creator | Cosentino, L. | es |
dc.creator | Barbagallo, M. | es |
dc.creator | Colonna, Nicola | es |
dc.creator | Mengoni, A. | es |
dc.creator | Massimi, C. | es |
dc.creator | Lo Meo, Sergio | es |
dc.creator | Finocchiaro, P. | es |
dc.creator | Chiaveri, Enrico | es |
dc.creator | Cortés Giraldo, Miguel Antonio | es |
dc.creator | Guerrero Sánchez, Carlos | es |
dc.creator | Lerendegui Marco, Jorge | es |
dc.creator | Quesada Molina, José Manuel | es |
dc.creator | Sabaté Gilarte, Marta | es |
dc.date.accessioned | 2019-09-18T11:00:10Z | |
dc.date.available | 2019-09-18T11:00:10Z | |
dc.date.issued | 2019-07-01 | |
dc.identifier.citation | Armaducci, S., Cosentino, L., Barbagallo, M., Colonna, N., Mengoni, A., Massimi, C.,...,Sabaté Gilarte, M. (2019). Measurement of the 235U(n, f) cross section relative to the 6Li(n, t) and 10B(n, α) standards from thermal to 170 keV neutron energy range at n_TOF. European Physical Journal A, 55 (7), 120-1-120-19. | |
dc.identifier.issn | 1434-6001 | es |
dc.identifier.issn | 1434-601X | es |
dc.identifier.uri | https://hdl.handle.net/11441/89191 | |
dc.description.abstract | The 235U(n, f) cross section was measured at n_TOF relative to 6Li(n, t) and 10B(n,α) , with high resolution (L= 183. 49 (2) m) and in a wide energy range (25meV-170keV) with 1.5% systematic uncertainty, making use of a stack of six samples and six silicon detectors placed in the neutron beam. This allowed us to make a direct comparison of the yields of the 235U(n, f) and of the two reference reactions under the same experimental conditions, and taking into account the forward/backward emission asymmetry. A hint of an anomaly in the 10-30keV neutron energy range had been previously observed in other experiments, indicating a cross section systematically lower by several percent relative to major evaluations. The present results indicate that the cross section in the 9-18keV neutron energy range is indeed overestimated by almost 5% in the recently released evaluated data files ENDF/B-VIII.0 and JEFF3.3, as a consequence of a 7% overestimate in a single GMA node in the IAEA reference file. Furthermore, these new high-resolution data confirm the existence of resonance-like structures in the keV neutron energy region. The results here reported may lead to a reduction of the uncertainty in the 1-100keV neutron energy region. Finally, from the present data, a value of 249. 7 ± 1. 4 (stat) ± 0. 94 (syst) b·eV has been extracted for the cross section integral between 7.8 and 11eV, confirming the value of 247. 5 ± 3 b·eV recently established as a standard. | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | Springer Nature | es |
dc.relation.ispartof | European Physical Journal A, 55 (7), 120-1-120-19. | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Neutrons | es |
dc.subject | Resonance | es |
dc.subject | Resonance parameters | es |
dc.title | Measurement of the 235U(n, f) cross section relative to the 6Li(n, t) and 10B(n, α) standards from thermal to 170 keV neutron energy range at n_TOF | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.publisherversion | http://doi.org/10.1140/epja/i2019-12802-7 | es |
dc.identifier.doi | 10.1140/epja/i2019-12802-7 | es |
idus.format.extent | 19 p. | es |
dc.journaltitle | European Physical Journal A | es |
dc.publication.volumen | 55 | es |
dc.publication.issue | 7 | es |
dc.publication.initialPage | 120-1 | es |
dc.publication.endPage | 120-19 | es |