Measurement of the differential cross sections and angle-integrated cross sections of the ⁶Li(n, t)⁴He reaction from 1.0 eV to 3.0 MeV at the CSNS Back-n white neutron source *

Abstract

The 6Li(n, t)4He reaction was measured as the first experiment involving neutron-induced charged particle emission reactions at the CSNS (China Spallation Neutron Source) Back-n white neutron source. The differential cross-sections of the 6Li(n,t)4He reaction at 15 detection angles ranging from 19.2° to 160.8° are obtained from 1.0 eV to 3.0 MeV at 80 neutron energy points; for 50 energy points below 0.1 MeV they are reported for the first time. The results indicate that the anisotropy of the emitted tritium is noticeable above E n = 100 eV. The angle-integrated cross-sections are also obtained. The present differential cross-sections agree in general with the previous evaluations, but there are some differences in the details. More importantly, the present results indicate that the cross-sections of the 6Li(n, t)4He reaction might be overestimated by most evaluations in the 0.5 − 3.0 MeV region, although they are recommended as standards below 1.0 MeV.

Measurement of differential cross sections of neutron-induced deuteron production reactions on carbon from 25 to 52 MeV *

“…In addition, the data using Talys-1.9 code with default parameters [36] were calculated in the present work, and the results are presented in each plot. The data from the JENDL-4.0/HE-2015 library [22,37] and the ENDF-B/VIII.0 library [38] are also included in Fig. 9, all of which were calculated based on GNASH code [39].…”

“…As it is not convenient to compare the present results, R(θ L , E n ), to the previous ones obtained directly, the differential cross sections of the 12 C(n, xd) reactions were thus calculated using the differential cross section data of the n-p scattering from the JENDL-4.0/HE-2015 library as the standard [22]. data extracted from the JENDL-4.0/HE-2015 library were originally given as Legendre polynomial coefficients in the center-of-mass (CM) system.…”

“…To compare the results from the present work with the previous ones from the literature [9,13,[16][17][18] and the data from theoretical calculations [19], differential cross sections of the 12 C(n, xd) reactions are obtained using the measured data R(θ L , E n ) and the evaluated n-p scattering differential cross sections from the JENDL-4.0/HE-2015 library for normalization [22], as described in Eq. (2).…”

“…Measurements of the carbon sample for the 12 C(n, xd) reactions and the polyethylene sample for the n-p elastic scattering were performed. Ratios of the differential cross sections of the 12 C(n, xd) reactions to those of the n-p scattering were measured, and then the differential cross sections of the 12 C(n, xd) reactions were obtained using the differential cross sections of the n-p scattering [21] from the JENDL-4.0/HE-2015 library [22] as the standard.…”

“…The previous experimental results were taken from the EXFOR library [14] and they include those of Subramanian et al 1983 [16], , McNaughton et al 1975, Nauchi et al 1999 [17], and Young et al 1988 [18]. The evaluated data were taken from the JENDL-4.0/HE-2015 library [22,37] and the ENDF-B/VIII.0 library [38], which were all calculated using GNASH code [39]. The theoretical calculations were carried out by Brenner et al [19].…”