Lead slowing-down neutron spectrometry 1: cross-section data for 241Am(n, f), 242mAm(n, f), 243Am(n, f) at energies up to 100 keV

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Abstract

A review of the results of a series of works performed by a joint group of researchers from the INR RAS and the SSC RF–IPPE on the lead slowing-down neutron spectrometer SVZ-100 to measure the fission cross-sections of americium isotopes 241Am, 242mAm, 243Am by neutrons with energies below 100 keV is presented. Due to the large mass of the working substance (100 tons of high-purity lead) and the generation of neutrons by protons with an energy of 209 MeV at the INR RAS accelerator, the high aperture ratio of the SVZ-100 made it possible to study neutron-nuclear processes in microgram samples of radioactive nuclides, which is not available in experiments using time-of-flight spectrometry. Unique scientific information has been obtained, partially compensating for the missing, or supplementing the existing, but often contradictory or insufficient data of experiments performed both on time-of-flight facilities and on lead slowing-down neutron spectrometers at other research centres. The results of the work of INR RAS–SSC RF–IPPE are reflected in international nuclear databases and indicate in a number of cases the need to adjust the recommended approximating and calculated values. Information is provided on the few carried out experiments and planned studies of neutron-induced fission cross-sections of americium isotopes in other centres after the completion of the work of the INR RAS–SSC RF–IPPE.

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E. A. Koptelov

Institute for Nuclear Research RAS

Author for correspondence.
Email: koptelov@inr.ru
Russian Federation, 117312, Moscow

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Supplementary files

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2. Fig. 1. Reduced cross section σ(E)E1/2 of 241Am fission depending on neutron energy E in the region below 30 eV (a) 80–40 keV (b): squares – INR–IPPE data [14, 15]; circles – Kyoto (KULS) [22]; upward triangles – RRC KI (SVZ-50) [24]; downward triangles – modified RRC KI data. Solid line – ENDF/B-VII.I estimate averaged over the SVZ-100 resolution function (ΔE/E = 0.28).

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3. Fig. 2. Preliminary experimental data [49] (n_TOF, CERN) for measuring the fission cross section of 241Am(n,f) nuclei in the energy range from a few MeV to MeV at 60% of full statistics (black lines and circles indicating the error). Good agreement with the recommended values ​​of the ENDF/B-VIII.0 (thick line 1) and JEFF-3.3 (thin line 2) libraries in the near-threshold energy range. A region of unresolved resonances (energy greater than 150 eV) is observed. For resolved resonances (less than 150 eV), an overlap of the recommended data and a spread of the measured values ​​are noticeable.

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4. Fig. 3. Reduced cross section σ(E)E1/2 of fission of 242mAm nuclei depending on neutron energy E in the region below 2 eV (a) and 1 eV – 30 keV (b): circles – INR–IPPE data [14]; line – ENDF/B-VII data; triangles – Oak Ridge results [26]; squares – SVZ-40 data [29]. The ENDF/B-VII and [26] values ​​are averaged over the SVZ-100 resolution function (the ENDF/B-VII estimate is based on the data of [27]).

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5. Fig. 4. Comparison of the results of measuring the fission cross section of 242mAm(n,f) with the data of other spectrometers and the recommended JENDL-3.3 data (solid line), averaged taking into account the resolution of the SVZ [51]: filled circles – SVZ-40 (KULS, 2012, [51]); empty circles – SVZ-50 (IAE, [24]); squares – SVZ-40 (KULS, 2001, [29]); triangles – SVZ-100 (INR–IPPE, [11]).

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6. Fig. 5. Reduced cross-section σ(E)E1/2 of 243Am fission depending on neutron energy E: squares – INR–IPPE data [13, 14]; triangles – KULS data [35]; thin line – ENDF/B7 estimate; thick line – JENDL-4.0 estimate; data averaged over the SVZ-100 resolution function.

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