Elsevier

Nuclear Physics A

Volume 384, Issues 1–2, 9–16 August 1982, Pages 88-96
Nuclear Physics A

Radiative capture of fast neutrons by 165Ho and 238U

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Abstract

Radiative capture of fast neutrons by the deformed nuclei 165Ho and 238U was measured over the 7 to 15 MeV incident neutron energy range. The γ-ray detector was a large NaI(T1) anti-Compton spectrometer, and time-of-flight techniques were used to suppress background. The total radiative capture cross section exhibits an energy dependence that clearly indicates the importance of the direct-semidirect reaction mechanism. Theoretical calculations compare favorably with experimental observations. However, the shapes of the observed γ-ray spectra differ from those calculated, indicating problems in estimating the distribution of single-particle strength for these deformed nuclei.

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    The data reported by (Linenberger et al., 1946; Leipunskiy et al., 1958; Barry et al., 1964; Drake et al., 1971; Panitkin and Tolstikov, 1972a, 1972b) within the neutron energies of 5–7 MeV and 17–20 MeV as well as by (Perkin et al., 1958) at 14.5 MeV are significantly higher than the present data. On the other hand, the data of (McDaniels et al., 1982) around the neutron energies of 9.2–14.2 MeV are lower than the data of present work at the neutron energies of 8.96 ± 0.77, 12.47 ± 0.83 and 16.63 ± 0.95 MeV. The 238U(n, γ) reaction cross-sections obtained by (Panitkin and Tolstikov, 1972a, 1972b) within the neutron energies of 5–7 MeV and 17–20 MeV as well as by (Perkin et al., 1958) at 14 MeV are based on the D+D and D+T neutron sources.

  • Measurement of the neutron capture cross-section of <sup>238</sup>U at neutron energies of 5.9 ± 0.5 and 15.5 ± 0.7 MeV by using the neutron activation technique

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    At neutron energy of 9.85 MeV, our earlier data (Naik et al., 2012) is comparable to the data of Mc Daniels et al. (1982). At neutron energy of 17 MeV, the 238U(n,γ)239U reaction cross-section data of Panitkin and Tolstikov (1972a,b) increase suddenly compared to the data of Mc Daniels et al. (1982) and thereafter remain constant up to 20 MeV. Thus, the data of Leipunskiy et al. (1958) and Panitkin and Tolstikov (1972a,b) above neutron energy of 3.7 MeV and the data of Panitkin and Tolstikov (1972a,b) above 17 MeV are higher than the evaluated data from ENDF/B-VII.1, JENDL-4.0, JEFF-3.1/A. On the other hand, our earlier data at neutron energy of 9.85 MeV (Naik et al., 2012) and the data of Mc Daniels et al. (1982) within 7–14 MeV are in agreement with the evaluated data of ENDF/B-VII.1, JENDL-4.0 and JEFF-3.1/A compilation.

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