Radiative neutron capture: Hauser Feshbach vs. statistical resonances

Rochman, D.; Goriely, Stéphane; Koning, A. J.; Ferroukhi, H.

doi:10.1016/j.physletb.2016.11.018

Cited by 30 publications

(26 citation statements)

References 24 publications

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“…The HFR is also applied to isomers when included in TENDL (isomers living longer than 1 sec). Alternatively, the HFR was tested over 3300 isotopes (from the stability line to the neutron drip line), showing expected behaviors for neutron-rich isotopes important in astrophysics [19].…”

Section: Hfrmentioning

confidence: 99%

“…Such project includes nuclear data evaluations for neutron, proton, deuteron, triton, helium-3, alpha, and photon induced reactions. To illustrate the evolution, the TENDL-2008 library included 350 isotopic evaluations from 19 F to 209 Po for neutron induced reactions, whereas the TENDL-2015 library includes more than 2800 evaluations for neutron (all isotopes from 1 H to 289 Fl leaving longer than 1 sec.) up to 200 MeV with covariance files, fission yields, thermal scattering data and so-called random files for uncertainty propagation.…”

Section: Introductionmentioning

confidence: 99%

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The TENDL library: Hope, reality and future

et al. 2017

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Abstract. The TALYS Evaluated Nuclear Data Library (TENDL) has now 8 releases since 2008. Considerable experience has been acquired for the production of such general-purpose nuclear data library based on the feedback from users, evaluators and processing experts. The backbone of this achievement is simple and robust: completeness, quality and reproducibility. If TENDL is extensively used in many fields of applications, it is necessary to understand its strong points and remaining weaknesses. Alternatively, the essential knowledge is not the TENDL library itself, but rather the necessary method and tools, making the library a side product and focusing the efforts on the evaluation knowledge. The future of such approach will be discussed with the hope of nearby greater success.

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Section: Hfrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The TENDL library: Hope, reality and future

et al. 2017

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“…This is also similar to the sampling of resonance parameters in Refs. [26,27], but with a few differences. Only one random ladder of resonance energies is sampled in Refs.…”

Section: Urr Parameters and Sampling Of Resonances In Thementioning

confidence: 99%

“…Only one random ladder of resonance energies is sampled in Refs. [26,27], while, in this work, one random set of resonances (including their positions) is sampled for each random set of ND, and each time using URR parameters obtained from the corresponding random TALYS parameters. However, the distribution of the resonance energies Table 4: Harvey's quoted resonance parameters (from EXFOR entry 10680) with quoted uncertainties, as well as the mean values and uncertainties obtained in this work, discussed in Sec.…”

Section: Urr Parameters and Sampling Of Resonances In Thementioning

confidence: 99%

“…4.1), these resonances cannot be clearly distinguished, so they are only used in the determination of (ℓ, (6) .97(4) 11.15(9) 1.52(6) .79(1) .209 (8) .00019(1) .00019(2) .123 (6) .099(7) .21 (4 is somewhat simplified in this work (Wigner distribution), compared to Refs. [26,27]. In this work, resonance ladders are sampled for all combinations of orbital angular momenta ℓ and resonance spins J for ℓ ∈ {0, 1, 2}.…”

Section: Urr Parameters and Sampling Of Resonances In Thementioning

confidence: 99%

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Uncertainty-driven nuclear data evaluation including thermal (n, α ) applied to 59 Ni

Helgesson

Sjöstrand

Rochman

2017

Nuclear Data Sheets

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This paper presents a novel approach to the evaluation of nuclear data (ND), combining experimental data for thermal cross sections with resonance parameters and nuclear reaction modeling. The method involves sampling of various uncertain parameters, in particular uncertain components in experimental setups, and provides extensive covariance information, including consistent cross-channel correlations over the whole energy spectrum. The method is developed for, and applied to, 59 Ni, but may be used as a whole, or in part, for other nuclides. 59 Ni is particularly interesting since a substantial amount of 59 Ni is produced in thermal nuclear reactors by neutron capture in 58 Ni and since it has a non-threshold (n,α) cross section. Therefore, 59 Ni gives a very important contribution to the helium production in stainless steel in a thermal reactor. However, current evaluated ND libraries contain old information for 59 Ni, without any uncertainty information. The work includes a study of thermal cross section experiments and a novel combination of this experimental information, giving the full multivariate distribution of the thermal cross sections. In particular, the thermal (n,α) cross section is found to be (12.7 ± .7) b. This is consistent with, but yet different from, current established values.Further, the distribution of thermal cross sections is combined with reported resonance parameters, and with TENDL-2015 data, to provide full random ENDF files; all this is done in a novel way, keeping uncertainties and correlations in mind. The random files are also condensed into one single ENDF file with covariance information, which is now part of a beta version of JEFF 3.3.Finally, the random ENDF files have been processed and used in an MCNP model to study the helium production in stainless steel. The increase in the (n,α) rate due to 59 Ni compared to fresh stainless steel is found to be a factor of 5.2 at a certain time in the reactor vessel, with a relative uncertainty due to the 59 Ni data of 5.4 %.

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Nuclear Data and Experiments for Astrophysics

Kankainen

Goriely

2022

The Euroschool on Exotic Beams, Vol. VI

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Nuclear astrophysics aims to understand the origin of elements and the role of nuclear processes in astrophysical events. Nuclear reactions and reaction rates depend strongly on nuclear properties and on the astrophysical environment. Nuclear inputs for stellar reaction rates involve a variety of nuclear properties, theoretical models, and experimental data. Experiments providing data for nuclear astrophysics range from stable ion beam direct measurements to radioactive beam experiments employing inverse kinematics or indirect methods. Many properties relevant for astrophysical calculations, such as nuclear masses and β-decays, have also been intensively studied. This contribution shortly introduces selected astrophysical processes, discusses the related nuclear data needs, and gives examples of recent experimental and theoretical efforts in the field. Origin of Elements and Nucleosynthesis Processes The Composition of the UniverseOur knowledge of the composition of the Universe in general, and of our Solar System in particular, results almost entirely from the analysis of electromagnetic spectra originating from the various observable sources in the Universe, i.e., the

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Radiative neutron capture: Hauser Feshbach vs. statistical resonances

Cited by 30 publications

References 24 publications

The TENDL library: Hope, reality and future

The TENDL library: Hope, reality and future

Uncertainty-driven nuclear data evaluation including thermal (n, α ) applied to 59 Ni

Nuclear Data and Experiments for Astrophysics

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