Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV

Anderl, R.A.; Yester, Michael V.; Morrison, R.C.

doi:10.1016/0375-9474(73)90560-5

Cited by 23 publications

(7 citation statements)

References 28 publications

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“…The 238 U(γ,f) reaction cross section results are listed in Table III and plotted in Fig. 15, along with all available literature data sets which extend below an excitation energy of 6 MeV [4,43,45,46,49,[51][52][53][54][55][56][57] and the ENDF/B-VIII.0 evaluation [47]. The present results are in good agreement with the data of Ostapenko et al [55], Zhuchko et al [45] and Soldatov and Smirenkin [56] obtained using bremsstrahlung beams.…”

Section: Photofission Cross Sectionsmentioning

confidence: 99%

“…[45] extends down to E γ = 3.42 MeV, these data could supplement the present data set below E γ = 4.6 MeV, the lowest energy non-zero data point. [43,45,[54][55][56], data obtained using quasi-monoenergetic γ-ray beams (purple crosses, blue stars, orange triangles, blue crosses, pink diamonds, green triangles, blue squares) [4,46,49,[51][52][53]57] and the ENDF/B-VIII.0 evaluation (dashed line) [47]. Vertical error bars represent statistical uncertainty and horizontal bars represent the energy resolution of the γ-ray beams.…”

Section: Photofission Cross Sectionsmentioning

confidence: 99%

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Near-barrier photofission in Th232 and U238

Silano

Karwowski

2018

Phys. Rev. C

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A study of photofission of 232 Th and 238 U was performed using quasi-monoenergetic, linearlypolarized γ-ray beams from the High Intensity γ-ray Source at Triangle Universities Nuclear Laboratory. The prompt photofission neutron polarization asymmetries, neutron multiplicities and the photofission cross sections were measured in the near-barrier energy range of 4.3-6.0 MeV. This data set constitutes the lowest energy measurements of those observables to date using quasimonoenergetic photons. Large polarization asymmetries are observed in both nuclei, consistent with the E1 excitation as observed by another measurement of this kind made in a higher energy range. Previous experimental evidence of a deep third minimum in the 238 U fission barrier has been identified as an accelerator-induced background.

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Section: Photofission Cross Sectionsmentioning

confidence: 99%

Section: Photofission Cross Sectionsmentioning

confidence: 99%

Near-barrier photofission in Th232 and U238

Silano

Karwowski

2018

Phys. Rev. C

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“…With these sources, the photon beam axis and energy were selected by Compton scattering of the γ rays emitted from the capture reaction to a specific angle. For example, in 1973 Anderl et al [19] reported photofission cross-section measurements on 235 U and 238 U at relatively low energy, E γ = 5.0 -8.0 MeV. The photons were obtained by Compton scattering of γ rays produced by neutron capture on nickel.…”

Section: Photo-induced Fission Of 235 U 238 U and 239 Pumentioning

confidence: 99%

Monoenergetic photon-induced fission cross-section ratio measurements for U235 , U238 , and
Krishichayan
¹
,
Finch
²
,
Howell
³

et al. 2018
Phys. Rev. C

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Background High-accuracy data are needed to advance microscopic descriptions of the nuclear fission process, to improve the predictive precision of phenomenological models, and for applications in nuclear energy and homeland security. Purpose The main goal of this work is to provide high-accuracy cross-section data for photofission of 235 U, 238 U, and 239 Pu in the energy range from the fission threshold to the high-energy tail of the Giant Dipole Resonance (GDR). These new data should contribute significantly to the reduction of the systematic uncertainty in evaluated photofission cross-section databases. Method Cross-section ratios for photofission of the "Big Three" actinide nuclei were measured using a quasi-monoenergetic photon beam and dual-fission chambers. The measurements were performed at the HIγS facility using a photon beam produced from Compton backscattering of freeelectron laser light. The dual-fission chamber enabled simultaneous counting of fission events from two targets. This method allows for cross-section ratio measurements with very small systematic errors. The largest source of systematic error in the determination of the cross-section ratios is the uncertainty in the ratio of the target thicknesses. Results We report photon-induced fission cross-section ratios for σ(235 U(γ, f)/ 238 U(γ, f)), σ(235 U(γ, f)/ 239 Pu(γ, f)), and σ(238 U(γ, f)/ 239 Pu(γ, f)) at photon energies from 9.0 to 17.0 MeV. More than 20 data points were measured for each ratio, and the systematic uncertainties are less than 2%. Conclusion The present photofission cross-section ratio data sets are compared to ratios computed from previous measurements, to the corresponding neutron-induced fission cross-section ratios, and to ratios computed from evaluated databases. The data obtained in this work for σ(235 U(γ, f)/ 238 U(γ, f)) are consistent with the existing data, while for σ(235 U(γ, f)/ 239 Pu(γ, f)) and σ(238 U(γ, f)/ 239 Pu(γ, f)) the present data are systematically lower.

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“…Figures 9 and 10 show the data of Manfrenidi et al, 23 Mafra et al 24 who employed the same method as Khan and Knowles 22 and Fig. 11 shows data of Andrel et al, 25 Caldwell et al 26 who employed neutron-capture γ-rays as the photon source. The photon spectrum used in both of the above measurements consisted of discrete lines a few electron volts wide.…”

Section: Anisotropy Calculationsmentioning

confidence: 99%

MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF²³⁸UUSING MICROTRON FACILITY

Prakash

Sanjeev

Kumar

et al. 2011

Int. J. Mod. Phys. E

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Photofission cross-section of 238 U was measured using bremsstrahlung radiation energy 7.4-9.0 MeV with energy step of 0.4 MeV by employing Lexan polycarbonate film as solid state nuclear track detector (SSNTD). The photon intensity from the Microtron accelerator at a distance of 15 cm from the bremsstrahlung converter (tantalum target) facility was estimated to be 10 10 photons/sec using the code EGS-4. In this paper, details of the fission fragment angular distribution measurements of 238 U target using Lexan polycarbonate have been discussed. The photofission cross-section was calculated using the angular distribution of fission fragments and the results were compared with those obtained using the code EMPIRE-II and various barrier parameters of the RIPL-1, RIPL-2 libraries and with the new analytical fission barrier formula based on the Hugenholtz-Van Hove theorem. The present experimental measurements were in good agreement with the results obtained from the Empire-II code predictions for potential parameter taken from RIPL-1 and a newly developed analytical fission barrier formula.

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Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV

Cited by 23 publications

References 28 publications

Near-barrier photofission in Th232 and U238

Near-barrier photofission in Th232 and U238

Monoenergetic photon-induced fission cross-section ratio measurements for U235 , U238 , and
Krishichayan
¹
,
Finch
²
,
Howell
³

et al. 2018
Phys. Rev. C

MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF²³⁸UUSING MICROTRON FACILITY

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Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV

Cited by 23 publications

References 28 publications

Near-barrier photofission in Th232 and U238

Near-barrier photofission in Th232 and U238

Monoenergetic photon-induced fission cross-section ratio measurements for U235 , U238 , and Krishichayan1, Finch2, Howell3 et al. 2018Phys. Rev. C

MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF238UUSING MICROTRON FACILITY

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Monoenergetic photon-induced fission cross-section ratio measurements for U235 , U238 , and
Krishichayan
¹
,
Finch
²
,
Howell
³

et al. 2018
Phys. Rev. C

MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF²³⁸UUSING MICROTRON FACILITY