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

Abstract : The integral measurement of the $^{12}$C(n,p)$^{12}$B reaction was performed at the neutron time of flight facility n_TOF at CERN. The total number of $^{12}$B 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 13.6 MeV to 10 GeV. Having been measured up to 1 GeV on basis of the $^{235}$U(n,f) reaction, the neutron energy spectrum above 200 MeV has been reevaluated due to the recent extension of the cross section reference for this particular reaction, which is otherwise considered a standard up to 200 MeV. The results from the dedicated GEANT4 simulations have been used to evaluate the neutron flux from 1 GeV up to 10 GeV. The experimental results related to the $^{12}$C(n,p)$^{12}$B reaction are compared with the evaluated cross sections from major libraries and with the predictions of different GEANT4 models, which mostly underestimate the $^{12}$B 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.
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Submitted on : Thursday, June 9, 2016 - 3:21:54 PM
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P. Žugec, N. Colonna, D. Bosnar, A. Ventura, A. Mengoni, et al.. Integral measurement of the 12C(n, p)12B reaction up to 10 GeV. European Physical Journal A, EDP Sciences, 2016, 52 (4), pp.101. ⟨10.1140/epja/i2016-16101-7⟩. ⟨in2p3-01329457⟩



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