Integral and differential cross-sections for the fission of Th232 by neutrons near the threshold

Measurement of the $$^{232}$$Th(n,f) cross section with quasi-monoenergetic neutron beams in the energy range 2–18 MeV

“…The most recent data of Shcherbakov et al [6] are in fair agreement with the data of Meadows [9] and seem to give slightly higher crosssection values than the data of the present work, even though an agreement within errors is observed for the neutron energies at 3.0, 3.5 and 4.5 MeV. Finally, the data of Ermagambetov et al [16] have systematically lower cross-section values compared to the data of the present work. The cross-section results of our work are in overall good agreement with the ENDF/B-VIII.0 (which agrees with JEFF-3.3) evaluation, For the data point at 9.9 MeV, presented in Fig.…”

“…Another group of parasitic neutrons, created via interactions of the particle beam with nuclei present in the beam line (such as 12 C, 16 O) and in the target container (gas cell and 3 H target holder) was estimated experimentally for the 2 H(d,n) and 3 H(d,n) irradiations, by measurements with and without the presence of the neutron producing target. In the case of the 2 H(d,n) neutron producing reaction, the deuterium gas was removed from the gas cell and the fission counts recorded were attributed to parasitic neutrons from deuteron induced reactions in the beam line and the materials of the gas cell, such as 12 C(d,n), and it was taken into account in the analysis by subtracting the parasitic counts from the total fission counts after normalizing to the incident charge.…”

“…Various experimental datasets for the fission cross section of 232 Th in the energy range covered by the present work are available in EXFOR [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], while only the latest data of Shcherbakov et al and the older data of Lisowski et al cover the whole fast neutron energy region. Still discrepancies in the order of 30% are observed between the existing datasets, while the evaluated libraries also present differences up to 10%.…”