Activation Cross Sections of (n,α) Reactions at 14.7 MeV in the Region of Rare Earths

Abstract

Cross sections for (n, a) reactions at 14.7 ± 0.3 MeV on twentyfive stable nuclei of the elements lanthanum, cerium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and hafnium have been measured by the activation technique using high-pressure liquid chromatography and high-resolution 7-ray spectroscopy. The cross section shows a strong dependence on the relative neutron excess (N-Z)/A of the target nucleus. Hauser-Feshbach calculations show that the contributions of statistical processes to the total (n, a) cross section are small.

Determination of the cross section for (n,p) and (n,α) reactions on 165Ho at 13.5 and 14.8 MeV

“…The measured cross sections for 165 Ho(n,α) 162 Tb reaction are shown in Fig. 4, together with the results of previous experiments (Sakane et al, 1996;Fang et al, 2008;Ryves et al, 1990;Qaim, 1984;Hirose et al, 1996;Prasad et al, 1969). In the energy region between 13 and 15 MeV, agreement between different measured data is very good within their experimental uncertainty.…”

Cross sections for d-3H neutron interactions with samarium isotopes

“…From Figure 8 it can be seen that over the neutron energies 13.5 to 14.8 MeV, our cross section values are in agreement with the theoretical data of TALYS-1.6 and EMPIRE-3.2 codes within experimental uncertainty, but the present results and theoretical data are lower than the values of the literature [6,7,12,14,15,19,20]. At the neutron energy of 13.5 MeV, our result gives the first reported value.…”

“…We can see from Figure 6 that the cross sections of 144 Sm(n,p) 144 Pm reaction estimated by the EMPIRE-3.2 code initially increase but later on decrease with neutron energy above 18 MeV, whereas those estimated by the TALYS-1.6 code continuously increase with neutron energy. agreement between different measured data is very good within their experimental uncertainties, except for the data of Wille and Fink [7], Kong et al [12], and Qaim [19] which are about 18, 2, and 2 times higher than the other measured data, respectively. The shapes of the excitation curves of the TALYS-1.6 and EMPIRE-3.2 calculation also exhibit a trend similar to Refs.…”

“…In the case of 152 Sm(n, ) 149 Nd reaction, six earlier measurements could be found in the literature [6,7,12,14,15,19,20] and all earlier data are only at one energy point. From Figure 8 it can be seen that over the neutron energies 13.5 to 14.8 MeV, our cross section values are in agreement with the theoretical data of TALYS-1.6 and EMPIRE-3.2 codes within experimental uncertainty, but the present results and theoretical data are lower than the values of the literature [6,7,12,14,15,19,20].…”

Cross section measurements of (n, 2n), (n, p) and (n, α) reactions on gadolinium isotopes in the neutron energy range of 13.5 to 14.8 MeV

“…Similarly, for the 158 Gd(n, α) 155 Sm reaction a few experimental cross section values were available in the 13.5-14.8 MeV region (cf. [24,28,[35][36][37]). Our value at 14.8 ± 0.2 MeV is consistent with the results of Sakane et al [35] and Qaim [37] but is lower than that of Havlik [24].…”