High-accuracy determination of the neutron flux at n TOF

Barbagallo, M.; Guerrero, C.; Tsinganis, A.; Tarrío, D.; Altstadt, S.; Andriamonje, S.; Andrzejewski, J.; Audouin, L.; Bécares, V.; Becvar, F.; Belloni, Fabio; Calviño Tavares, Francisco; Cortés Rossell, Guillem Pere; Gómez Hornillos, María Belén; Hernández-Prieto, A.; Riego Pérez, Albert

doi:10.1140/epja/i2013-13156-x

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Document typeArticle

Defense date2013-12-18

Rights accessRestricted access - publisher's policy

European Commission's projectANDES - Accurate Nuclear Data for nuclear Energy Sustainability (EC-FP7-249671)

Abstract

The neutron flux of the n TOF facility at CERN was measured, after installation of the new spallation target, with four different systems based on three neutron-converting reactions, which represent accepted cross sections standards in different energy regions. A careful comparison and combination of the different measurements allowed us to reach an unprecedented accuracy on the energy dependence of the neutron flux in the very wide range (thermal to 1 GeV) that characterizes the n TOF neutron beam. This is a pre-requisite for the high accuracy of cross section measurements at n TOF. An unexpected anomaly in the neutron-induced fission cross section of 235U is observed in the energy region between 10 and 30 keV, hinting at a possible overestimation of this important cross section, well above currently assigned uncertainties.

CitationBarbagallo, M. [et al.]. High-accuracy determination of the neutron flux at n TOF. "European physical journal A", 18 Desembre 2013, vol. 49, núm. 12, p. 15601-15611.

URIhttp://hdl.handle.net/2117/21365

DOI10.1140/epja/i2013-13156-x

ISSN1434-6001

Publisher versionhttp://epja.epj.org/articles/epja/abs/2013/12/10050_2013_Article_9988/10050_2013_Article_9988.html

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