Energy-differential cross section of the natC(n,p) and natC(n,d) reactions was measured at the neutron timeof- flight facility n_TOF at CERN. The measurement was performed in the first experimental area (EAR1; flight path of 182.5 m). Two position-sensitive E-E silicon telescopes were used. Two naturally occurring carbon isotopes, 12C and 13C, contribute to the reactions on natural carbon, with the (n,p) reaction threshold at 13.7 MeV and the (n,d) threshold at 14.9 MeV (determined by the 12C isotope for both reactions). This paper provides the details of the analysis leading to the final results published previously as a Letter. The cross-section results are reported up to 25 MeV. During the data analysis the population of the excited states in the daughter nuclei 11B, 12B, and 13B had to be considered, requiring the adoption of the branching ratios and angular distributions of the emitted particles from an external source of information. TALYS-2.0 calculations were used as the main source and an in-depth analysis of the model-related uncertainties was performed. The n_TOF results are largely inconsistent with the major evaluation libraries. On the other hand, an unexpected agreement is found with TALYS-2.0 calculations. Specifically, the obtained cross section for the (n,p) reaction is significantly higher than in the available evaluations, fully supporting the earlier finding from an integral measurement at n_TOF.
Energy-differential measurement of the C nat ( n , p ) and C nat ( n , d ) reactions at the n_TOF facility at CERN
Mastromarco, M.Membro del Collaboration Group
;Perfetto, G.Membro del Collaboration Group
;
2026-01-01
Abstract
Energy-differential cross section of the natC(n,p) and natC(n,d) reactions was measured at the neutron timeof- flight facility n_TOF at CERN. The measurement was performed in the first experimental area (EAR1; flight path of 182.5 m). Two position-sensitive E-E silicon telescopes were used. Two naturally occurring carbon isotopes, 12C and 13C, contribute to the reactions on natural carbon, with the (n,p) reaction threshold at 13.7 MeV and the (n,d) threshold at 14.9 MeV (determined by the 12C isotope for both reactions). This paper provides the details of the analysis leading to the final results published previously as a Letter. The cross-section results are reported up to 25 MeV. During the data analysis the population of the excited states in the daughter nuclei 11B, 12B, and 13B had to be considered, requiring the adoption of the branching ratios and angular distributions of the emitted particles from an external source of information. TALYS-2.0 calculations were used as the main source and an in-depth analysis of the model-related uncertainties was performed. The n_TOF results are largely inconsistent with the major evaluation libraries. On the other hand, an unexpected agreement is found with TALYS-2.0 calculations. Specifically, the obtained cross section for the (n,p) reaction is significantly higher than in the available evaluations, fully supporting the earlier finding from an integral measurement at n_TOF.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
