High-accuracy determination of the neutron flux at n_TOF
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Date
Authors
Barbagallo, M.
Guerrero, C.
Tsinganis, A.
Tarrío, D.
Altstadt, S
Andriamonje, S.
Andrzejewski, J.
Audouin, L.
Bécares, V.
Bečvář, F.
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Springer Verlag
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.
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The European Physical Journal A