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EDP Sciences, The European Physical Journal A, 4(52)

DOI: 10.1140/epja/i2016-16101-7

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Integral measurement of the 12C(n, p)12B reaction up to 10 GeV

Journal article published in 2016 by P. Žugec, N. Colonna, D. Bosnar, A. Ventura, A. Mengoni, S. Altstadt, J. Andrzejewski, L. Audouin, F. Be, M. Barbagallo, V. Bécares, V. Becares, F. Bečvář, F. Belloni, E. Berthoumieux and other authors.
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Abstract

The integral measurement of the ¹²C(n, p)¹²B reaction was performed at the neutron time-of-flight facility n_TOF at CERN. The total number of ¹²B nuclei produced per neutron pulse of the n_TOF beam was determined using the activation technique in combination with a time-of-flight technique. The cross section is integrated over the n_TOF neutron energy spectrum from reaction threshold at 13.6MeV to 10GeV. Having been measured up to 1GeV on basis of the ²³⁵U(n, f ) reaction, the neutron energy spectrum above 200MeV has been re-evaluated due to the recent extension of the cross section reference for this particular reaction, which is otherwise considered a standard up to 200MeV. The results from the dedicated GEANT4 simulations have been used to evaluate the neutron flux from 1GeV up to 10GeV. The experimental results related to the ¹²C(n, p)¹²B reaction are compared with the evaluated cross sections from major libraries and with the predictions of different GEANT4 models, which mostly underestimate the 12B production. On the contrary, a good reproduction of the integral cross section derived from measurements is obtained with TALYS-1.6 calculations, with optimized parameters. ; This research was funded by the European Atomic Energy Community’s (Euratom) Seventh Framework Programme FP7/2007-2011 under the Project CHANDA (Grant No. 605203); by the Narodowe Centrum Nauki (NCN) grant UMO- 2012/04/M/ST2/00700; and by the Croatian Science Foundation under Project No. 1680.