Measurement of 
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) cross section data and their impact on reaction models

Kerveno, M.; Dupuis, Marc; Bacquias, A.; Belloni, F.; Bernard, D.; Borcea, C.; Boromiza, M.; Capote, R.; Jean, C. De Saint; Dessagne, P.; Drohé, Jean-Claude; Henning, G.; Hilaire, Stéphane; Kawano, Toshihiko; Leconte, Pierre; Nankov, N.; Negreţ, A.; Nyman, M.; Olacel, Adina; Plompen, A.; Romain, P.; Rouki, C.; Rudolf, G.; Stănoiu, M.; Wynants, R.

doi:10.1103/physrevc.104.044605

Cited by 21 publications

(25 citation statements)

References 53 publications

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“…We have also confirmed findings of Ref. [16] calling for substantially lower spin-cutoff parameters for spin distributions of exciton states in final nuclei. This does not necessarily invalidate Eq.…”

Section: Discussionsupporting

confidence: 89%

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Problem with gradual absorption in MSD/MSC calculations

Herman,

Kawano

2024

EPJ Web Conf.

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Replacing classical exciton model with the better founded Multistep Direct (MSD) and Multistep Compound (MSC) mechanisms has been impeded by incapability of the latter models to describe central part of the neutron emission spectra at incident neutron energies of about 14 MeV and above. We have ascribed this deficiency to the decrease of absorption to the MSC mechanism resulting from the concept of gradual absorption. We were able to obtain very good reproduction of experimentally measured neutron spectra using MSD/MSC calculations when this option was turned off. Such treatment is, however, at odds with the fundamental distinction between MSD and MSC mechanisms that should proceed through the chain of open (P-space) and closed (Q-space) configurations respectively. By blocking gradual absorption we allow the first stage of MSC to be fully populated from the incident channel that at higher incident energies is impossible. We discuss various attempts of addressing the problem that, so far, remains open. In addition, we present an evidence for much tighter spin distribution of particle-hole states than normally assumed.

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Section: Discussionsupporting

confidence: 89%

“…This observation is confirmed by the microscopic calculations reported in Ref. [16] that also call for a much smaller spincuttoff parameter than suggested by Eq. ( 9).…”

Section: Spin Distribution In Preequilibrium Emissionsupporting

confidence: 85%

Problem with gradual absorption in MSD/MSC calculations

Herman,

Kawano

2024

EPJ Web Conf.

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“…The energy of the reacting neutrons are calculated from their time of flight. The data analysis was performed by methods that were recently detailed in reference [12].…”

Section: Methodsmentioning

confidence: 99%

“…The obtained exclusive experimental data provide strong constraints on nuclear reaction models. So far, data for isotopes such as 232 Th [7], 235 U [8], 238 U [12], 182,184,186 W [10] have been recorded and analyzed.…”

Section: Motivationmentioning

confidence: 99%

Measurement of ¹⁸³W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)

Henning,

Maëlle,

Dessagne

et al. 2023

EPJ Web of Conf.

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The necessary improvement of evaluated nuclear databases for appplication will be achieved with improvement of models and new, precise data. In particular, the effect of inelastic neutrons scattering can be of importance for reactors. In order to test the models, we performed measurement of (n, n’γ) and (n, 2nγ) cross-sections on 183W. These data will help constrain the calculation codes and ensure a better evaluation of the total (n, xn) cross section. The experimental setup and the data analysis method will be presented. The preliminary experimental results for the 183W isotope will be compared to predictions from Talys nuclear reaction code.

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“…-Construction of the fission tagging chamber for the 239 Pu(n, γ) and preparation of Mo(n, γ) reactions to being measured at GELINA and n TOF. -New data taking and analysis of the 238 U(n,inel) reaction is completed; see reference [8], and new data taken for 233 U(n,inel), 209 Bi(n, γ) and 209 Bi(n,tot). -Improved analysis methods have been developed with better results for decay data taken with DTAS -the segmented total absorption gamma-ray spectrometer [9].…”

Section: Impact Of Sandamentioning

confidence: 99%

ARIEL & SANDA nuclear data activities

Franzen

Junghans

González

et al. 2022

EPJ Nuclear Sci. Technol.

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Nuclear data are fundamental quantities for developing nuclear energy concepts and research. They are essential for the simulation of nuclear systems, safety and performance calculations, and reactor instrumentation. Nuclear data improvement requires a combination of many different know-hows that are distributed over many institutions along Europe. In the EURATOM call for Nuclear Fission and Radiation Protection NFRP-2018, two nuclear data projects were started in September 2019: the Coordination and Support Action ARIEL (Accelerator and Research reactor Infrastructures for Education and Learning) and the Research and Innovation Action SANDA (Solving Challenges in Nuclear Data for the Safety of European Nuclear facilities). The ARIEL project integrates education and training of young scientists and technicians with access to neutron beam research infrastructures and supports scientific visits to conduct short-term research projects relevant to thesis works. The SANDA project is focuses on research innovation actions, including detector and nuclear target development, important nuclear data measurements, nuclear data evaluation, and validation. A description of these ongoing projects, including the first results, is the subject of this article.

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Measurement of U238(n,n′γ ) cross section data and their impact on reaction models

Abstract: Measuring and modeling (n, n ) cross section is chal-68 lenging leading to large uncertainties. Therefore it features 69 prominently in the High Priority Request List (HPRL) 70

Cited by 21 publications

References 53 publications

Problem with gradual absorption in MSD/MSC calculations

Problem with gradual absorption in MSD/MSC calculations

Measurement of ¹⁸³W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)

ARIEL & SANDA nuclear data activities

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Product

Resources

About

Measurement of U238(n,n′γ ) cross section data and their impact on reaction models

Abstract: Measuring and modeling (n, n ) cross section is chal-68 lenging leading to large uncertainties. Therefore it features 69 prominently in the High Priority Request List (HPRL) 70

Cited by 21 publications

References 53 publications

Problem with gradual absorption in MSD/MSC calculations

Problem with gradual absorption in MSD/MSC calculations

Measurement of 183W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)

ARIEL & SANDA nuclear data activities

Contact Info

Product

Resources

About

Measurement of ¹⁸³W(n, n’γ) and (n, 2nγ) cross-sections (preliminary)