Measurements of Νeff and σf + σc for fast neutrons in U235 and Pu239

Andreev, V.N.

doi:10.1007/bf02207350

Cited by 6 publications

(1 citation statement)

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“…In the lower range it is due to decreased fission competition, while in MeV-range it is an entrance/exit neutron channel effect. Figure 3 shows the description of capture data [15][16][17][18][19][20] for 235 U(n,γ) and prediction of 235m U(n,γ) cross section. The target spin differences strongly influences the (n,γf) competition to capture reaction (n,γγ).…”

Section: First Chance Fissionmentioning

confidence: 99%

^235mU and ²³⁵U neutron-induced fission

Maslov

2007

Nd2007

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Abstract. Neutron cross sections of 235 U and 235m U are obtained via Hauser-Feshbach model calculations. The cross section differences are attributed to the spectroscopic properties of the transition states at saddle deformations of 236 U and the coupling strengths of the deformed optical potential for the target spin values 7/2 − and 1/2 + . The 235m U(n,f) cross section at E n 0.1 MeV depends on the position of octupole states at outer saddle, being ∼2 times lower than that of 235 U(n,f) at E n ∼ 1 keV. The capture-to-fission ratio of 235 U and 235m U is affected at E n 0.1 MeV, being ∼2 times higher for the latter at E n ∼ 1 keV.235 U(n,xn) reaction cross sections and prompt fission neutron spectra (PFNS) are dependent on the emissive fission chances contributions to the observed σ(n, F) of 235 U, which are much different from the latest evaluations of ENDF/B and JEFF. The role of exclusive pre-fission (n,xnf) neutron spectra for the 235 U(n,F) PFNS description and prediction of PFNS for 239 Pu(n,F) is exemplified.

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