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論文

Simultaneous determination of neutron-induced fission and radiative capture cross sections from decay probabilities obtained with a surrogate reaction

P$'e$rez S$'a$nchez, R.*; Jurado, B.*; M$'e$ot, V.*; Roig, O.*; Dupuis, M.*; Bouland, O.*; Denis-Petit, D.*; Marini, P.*; Mathieu, L.*; Tsekhanovich, I.*; et al.

Physical Review Letters, 125(12), p.122502_1 - 122502_5, 2020/09

https://doi.org/10.1103/PhysRevLett.125.122502
 被引用回数：24 パーセンタイル：76.71(Physics, Multidisciplinary)

Reliable neutron-induced-reaction cross sections of unstable nuclei are essential for nuclear astrophysics and applications but their direct measurement is often impossible. The surrogate-reaction method is one of the most promising alternatives to access these cross sections. In this work, we successfully applied the surrogate-reaction method to infer for the first time both the neutron-induced fission and radiative capture cross sections of $$^{239}$$Pu in a consistent manner from a single measurement. This was achieved by combining simultaneously measured fission and $$gamma$$-emission probabilities for the $$^{240}$$Pu($$^{4}$$He, $$^{4}$$He') surrogate reaction with a calculation of the angular-momentum and parity distributions populated in this reaction. While other experiments measure the probabilities for some selected $$gamma$$-ray transitions, we measure the $$gamma$$-emission probability. This enlarges the applicability of the surrogate-reaction method.

論文

Determining the $$^{239}$$Np($$n$$,$$f$$) cross section using the surrogate ratio method

Czeszumska, A.*; Angell, C.; Burke, J. T.*; Scielzo, N. D.*; Norman, E. B.*; Austin, R. A. E.*; Boutoux, G.*; Casperson, R. J.*; Chodash, P.*; Hughes, R. O.*; et al.

Physical Review C, 87(3), p.034613_1 - 034613_6, 2013/03

AA2012-0918.pdf:0.85MB

https://doi.org/10.1103/PhysRevC.87.034613
 被引用回数：14 パーセンタイル：63.74(Physics, Nuclear)

Neutron-induced fission cross section data are needed in various fields of applied and basic nuclear science. However, cross sections of short-lived nuclei are difficult to measure directly due to experimental constraints. The first experimental determination of the neutron-induced fission cross section of $$^{239}$$Np at non-thermal energies was performed. The Surrogate Ratio Method (SRM) was employed to indirectly deduce the $$^{239}$$Np($$n$$,$$f$$) cross section. The surrogate reactions used were $$^{236}$$U$$(rm ^3He,p)$$ and $$^{238}$$U$$(rm ^3He,p)$$ with the reference cross section given by the well-known $$^{239}$$Np($$n$$,$$f$$) cross section. The ratio of observed fission reactions resulting from the two formed compound nuclei, $$^{238}$$Np and $$^{240}$$Np, was multiplied by the directly-measured $$^{237}$$Np($$n$$,$$f$$) cross section to determine the$$^{239}$$Np($$n$$,$$f$$) cross section. The $$^{239}$$Np($$n$$,$$f$$) cross section was determined with an uncertainty ranging between 3 - 30% over the energy range of 0.2 - 20 MeV.

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