Examining barrier distributions and, in extension, energy derivative of probabilities for surrogate experiments

Romain, P.; Duarte, H.; Morillon, B.

doi:10.1103/physrevc.85.044603

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…We expect therefore that present stepby-step surrogate demarch will bring convincing arguments in favor of indisputable inclusion of surrogate data in standard evaluation task for a step further towards low uncertainty evaluated neutron-induced reaction cross sections. Present work intends to solve most of the dilemma raised by recent surrogate analyses [10,13] that suggest we could work with confidence from experimental fission probabilities but not from γ-decay probabilities.…”

Section: B Questionable Srm Predictions As a Matter Of Factmentioning

confidence: 99%

“…Two clear benefits are expected: higher quality nuclear data uncertainty assessments on regular reactor fuel nuclides and actual experimental alternative to achieve suitable evaluated 'neutron-induced' cross section data for higher transuranic nuclei (as the Am, Np and Cm elements) that were described as 'exotic' actinides by Britt and Wilhelmy [4] in the seventies. Using mathematical derivatives of experimental probabilities, the authors of study [10] have recommended to not use the WE approximation to retrieve neutron-induced capture or fission cross sections from surrogate experiments. Even though, the authors suggested to use those derivatives to extract complementary information to NPS such that fission barrier heights.…”

Section: Introductionmentioning

confidence: 99%

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Revisiting fission-probability data using $\mathcal{R}$-matrix Monte-Carlo simulations : application to Pu fissile isotopes over the 4 to 8 MeV excitation energy range

Bouland,

Jurado

2019

Preprint

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This article describes an original approach to analyze simultaneously cross sections and surrogate data measurements using efficient Monte Carlo extended R-matrix theory algorithm based on unique set of nuclear structure parameters. The alternative analytical path based on the manifold Hauser-Feshbach equation was intensively used in this work to gauge the errors carried by the surrogatereaction method commonly taken to predict neutron-induced cross sections from observed partial decay probabilities. Present paper emphasizes in particular a dedicated way to treat direct reaction entrance and prior decay excited nucleus outgoing channels widths correlations. Present smart theoretical foundation brought the opportunity to apply successfully our method to both fissionprobability data and directly measured neutron cross sections according to Pu fissile isotopes; namely the 237,238,240,242 and 244 Pu * nuclei. This new capability opens genuine perspectives in matter of 'evaluation process' from foreseen fission-and γ-decay probabilities simultaneously measured as derived data will become available.

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Section: B Questionable Srm Predictions As a Matter Of Factmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revisiting fission-probability data using $\mathcal{R}$-matrix Monte-Carlo simulations : application to Pu fissile isotopes over the 4 to 8 MeV excitation energy range

Bouland,

Jurado

2019

Preprint

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“…Although a good agreement has been observed between surrogate results and measured neutron-induced fission crosssections [3][4][5], their theoretical description has been the subject of intense investigation [22], as the method is, in principle, restricted to specific conditions. The Weisskopf-Ewing approximation is only justified for high excitation energies, where the decay of the compound nucleus is dominated by statistical level densities, which have no dependence on the spin and parity [20].…”

Section: A the Surrogate-reaction Techniquementioning

confidence: 99%

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

et al. 2014

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Inelastic and multi-nucleon transfer reactions between a 238 U beam, accelerated at 6.14 MeV/u, and a 12 C target were used for the production of neutron-rich, fissioning systems from U to Cm. A Si telescope, devoted to the detection of the target-like nuclei, provided a characterization of the fissioning systems in atomic and mass numbers, as well as in excitation energy. Cross-sections, angular and excitation-energy distributions were measured for the inelastic and transfer channels. Possible excitations of the target-like nuclei were experimentally investigated for the first time, by means of γ-ray measurements. The decays from the first excited states of 12 C, 11 B and 10 Be were observed with probabilities of 0.12 -0.14, while no evidence for the population of higher-lying states was found. Moreover, the fission probabilities of 238 U, 239 Np and 240,241,242 Pu and 244 Cm were determined as a function of the excitation energy.

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Bruyères-le-Châtel Neutron Evaluations of Actinides with the TALYS Code: The Fission Channel

Romain

Morillon

Duarte

2016

Nuclear Data Sheets

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Examining barrier distributions and, in extension, energy derivative of probabilities for surrogate experiments

Cited by 5 publications

References 18 publications

Revisiting fission-probability data using $\mathcal{R}$-matrix Monte-Carlo simulations : application to Pu fissile isotopes over the 4 to 8 MeV excitation energy range

Revisiting fission-probability data using $\mathcal{R}$-matrix Monte-Carlo simulations : application to Pu fissile isotopes over the 4 to 8 MeV excitation energy range

Transfer reactions in inverse kinematics: An experimental approach for fission investigations

Bruyères-le-Châtel Neutron Evaluations of Actinides with the TALYS Code: The Fission Channel

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