Status Of The Jaeri FEL System

Ohkubo, M.; Sugimoto, M.; Sawamura, M.; Mashiko, K.; Minehara, Eisuke; Takabe, Masao; Sasabe, J.; Kawarasaki, Y.

doi:10.1109/fel.1989.716022

Cited by 2 publications

(4 citation statements)

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“…The minimum transmission value at this resonance was 0.215(2), while the maximum transmission was 1.002(4) at the cross section dip at 2.35 MeV. Our data below the first resonance in oxygen are slightly below the measurement of Ohkubo et al [16] but do not require a correction for moisture content of the target. The platinum data are in good agreement with earlier results and the first experiment to cover a large neutron energy range.…”

Section: Resultscontrasting

confidence: 58%

“…For neon and xenon only data from quasimonoener- Figure 6. The effective total cross sections for nat He, nat O, nat Ne, nat Xe, nat Pt, and 238 U are shown in comparison with selected experimental results from literature [4,[6][7][8][16][17][18][19][20][21][22][23][24][25][26][27][28] taken from the EXFOR data base [29] and data from the JEFF evaluation [30]. The data from this work are shown with energy bin sizes corresponding to a time-of-flight bin size of 0.5 ns.…”

Section: Resultsmentioning

confidence: 98%

“…The noble gases helium, neon and xenon have been investigated in a few experiments in the fast neutron range using quasimonoenergetic neutrons with limited energy resolution [6][7][8]. For neon the need for a more precise cross section determination has arisen from nuclear astrophysics [9] : 17 O(α, n) 20 Ne can reclaim neutrons lost by 16 O(n, γ) 17 O in s-process scenarios. Resonances in neon transmission below 1.5 MeV are not accessible easily in direct measurements.…”

Section: Introductionmentioning

confidence: 99%

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Neutron transmission measurements at nELBE

et al. 2020

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Neutron total cross sections are an important source of experimental data in the evaluation of neutron-induced cross sections. The sum of all neutron-induced reaction cross sections can be determined with a precision of a few per cent in a relative measurement. The neutron spectrum of the photoneutron source nELBE extends in the fast region from about 100 keV to 10 MeV and has favourable conditions for transmission measurements due to the low instantaneous flux of neutrons and low gamma-flash background. Several materials of interest (in part included in the CIELO evaluation or on the HPRL of OECD/NEA) have been investigated: 197Au [1, 2], natFe [2], natW [2], 238U, natPt, 4He, natO, natNe, natXe. For gaseous targets high pressure gas cells with flat end-caps have been built that hold up to 200 bar pressure. The experimental setup will be presented including results from several transmission experiments and the data analysis leading to the total cross sections will be discussed.

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Section: Resultscontrasting

confidence: 58%

Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Neutron transmission measurements at nELBE

et al. 2020

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“…The two last components of the Eq. [16][17][18][19][20][21][22][23][24] . For better display, only the (n, γ) calculation by TORA is drawn on this picture.…”

Section: Compound System Com Framework Physics Capabilities Of the Tomentioning

confidence: 99%

New perspectives in neutron reaction cross-section evaluation using consistent multichannel modeling methodology: Application to ¹⁷O^*

2020

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The traditional methodology of nuclear data evaluation is showing its limitations in reducing significantly the uncertainties in neutron cross sections below their current level. This suggests that a new approach should be considered. This work aims at establishing that a major qualitative improvement is possible by changing the reference framework historically used for evaluating nuclear model data. The central idea is to move from the restrictive framework of the incident neutron and target nucleus to the more general framework of the excited compound-system. Such a change, which implies the simultaneous modeling of all the reactions leading to the same compound-system, opens up the possibility of direct comparisons between nuclear model parameters, whether those are derived for reactor physics applications, astrophysics or basic nuclear spectroscopy studies. This would have the double advantage of bringing together evaluation activities performed separately, and of pooling experimental databases and basic theoretical nuclear parameter files. A consistent multichannel modeling methodology using the TORA module of the CONRAD code is demonstrated across the evaluation of differential and angle-integrated neutron cross sections of 16O by fitting simultaneously incident-neutron direct kinematic reactions and incident-alpha inverse kinematic reactions without converting alpha data into the neutron laboratory system. The modeling is fulfilled within the Reich-Moore formalism and an unique set of fitted resonance parameters related to the 17O* compound-system.

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Status Of The Jaeri FEL System

Cited by 2 publications

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Neutron transmission measurements at nELBE

Neutron transmission measurements at nELBE

New perspectives in neutron reaction cross-section evaluation using consistent multichannel modeling methodology: Application to ¹⁷O^*

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Status Of The Jaeri FEL System

Cited by 2 publications

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Neutron transmission measurements at nELBE

Neutron transmission measurements at nELBE

New perspectives in neutron reaction cross-section evaluation using consistent multichannel modeling methodology: Application to 17O*

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New perspectives in neutron reaction cross-section evaluation using consistent multichannel modeling methodology: Application to ¹⁷O^*