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High-accuracy determination of the neutron flux at n_TOF

Research output: Contribution to journalArticle

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Original languageEnglish
Article number156
Number of pages11
JournalEuropean Physical Journal A: Hadrons and Nuclei
Volume49
Issue12
DOIs
Publication statusPublished - 18 Dec 2013

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 U-235 is observed in the energy region between 10 and 30keV, hinting at a possible overestimation of this important cross section, well above currently assigned uncertainties.

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