CoH3: The Coupled-Channels and Hauser-Feshbach Code

Kawano, Toshihiko

doi:10.1007/978-3-030-58082-7_3

Cited by 17 publications

(13 citation statements)

References 31 publications

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“…The fission probabilities P f (E) for the first and second chances are calculated with the CoH 3 code [67]. The fission parameters, such as the fission barrier, curvature, and level density, are adjusted to reproduce the evaluated fission cross section of 235 U.…”

Section: Extrapolating To the Second Chance Fissionmentioning

confidence: 99%

Energy Dependent Calculations of Fission Product, Prompt, and Delayed Neutron Yields for Neutron Induced Fission on $^{235}$U, $^{238}$U, and $^{239}$Pu

Okumura¹,

Kawano²,

Lovell³

et al. 2021

Preprint

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We perform energy dependent calculations of independent and cumulative fission product yields for 235 U, 238 U, and 239 Pu in the first chance fission region. Starting with the primary fission fragment distributions taken from available experimental data and analytical functions based on assumptions for the excitation energy and spin-parity distributions, the Hauser-Feshbach statistical decay treatment for fission fragment de-excitation is applied to more than 1,000 fission fragments for the incident neutron energies up to 5 MeV. The calculated independent fission product yields are then used as an input of β-decay to produce the cumulative yield, and summation calculations are performed. Model parameters in these procedures are adjusted by applying the Bayesian technique at the thermal energy for 235 U and 239 Pu and in the fast energy range for 238 U. The calculated fission observable quantities, such as the energy-dependent fission yields, and prompt and delayed neutron yields, are compared with available experimental data. We also study a possible impact of the second chance fission opening on the energy dependence of the delayed neutron yield by extrapolating the calculation.

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Section: Extrapolating To the Second Chance Fissionmentioning

confidence: 99%

Energy Dependent Calculations of Fission Product, Prompt, and Delayed Neutron Yields for Neutron Induced Fission on $^{235}$U, $^{238}$U, and $^{239}$Pu

Okumura¹,

Kawano²,

Lovell³

et al. 2021

Preprint

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“…However, the nuclear reaction codes that were employed to create the photonuclear data library -EM-PIRE [72,73], TALYS [74], CCONE [75], and CoH 3 [76] -have implemented relatively simple pre-equilibrium models for photonuclear reactions. In some cases, the exciton model for a neutron-induced reaction is considered as a surrogate for the photo-induced precompound process, and the initial configuration of 1p-0h or 2p-1h is assumed.…”

Section: Pre-equilibrium Particle Emissionmentioning

confidence: 99%

“…The modern Hauser-Feshbach nuclear reaction codes, EMPIRE [72,73], TALYS [74], CCONE [75], and CoH 3 [76], which are often utilized for nucleon-induced reaction calculations, are also capable of calculating photo-induced reaction cross sections. As a result, they are widely used in the evaluation of general purpose nuclear data libraries, and are combined with the advancedcapabilities utility codes to create ENDF-6 format data files.…”

Section: B Nuclear Reaction Codes For Photonuclear Data Evaluationmentioning

confidence: 99%

“…Considering the above criteria, the partial and total photo-neutron reaction cross sections were evaluated using the method described above for the following nuclei; 59 Co, 63,65 Cu, 75 As, 76,78,80,82 Se, 89 Y, 90,91,92,94 Zr, 98 Mo, 103 Rh, 115 In, 116,117,118,119,120,122,124 Sn, 133 Cs, 138 Ba, 139 La, 140,142 Ce, 141 Pr, 145,148 Nd, 153 Eu, 159 Tb, 160 Gd, 165 Ho, 181 Ta, 186 W, 188,189,190,192 Os, 197 Au, 208 Pb, and 209 Bi. The derived cross-section data were compiled into the international EXFOR database as "evaluated" data and are available to the nuclear data community.…”

Section: Cumentioning

confidence: 99%

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IAEA Photonuclear Data Library 2019

Kawano¹,

Cho²,

Dimitriou³

et al. 2019

Preprint

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“…The modern Hauser-Feshbach nuclear reaction codes such as EMPIRE [8], TALYS [9], CCONE [10], and CoH3 [11], used to calculate photo-induced reaction crosssections, also call for testing in a wide range of atomic masses and energies. Although at present there is a sufficient dataset on the experimental cross-sections in the GDR energy region [12,13], the use of the data on singleor two-particle reactions only, precludes testing various theoretical concepts, because the results of calculations by different models (e.g., nuclear level density LD 1-6 computation in the TALYS1.95 code) differ from each other only slightly.…”

Section: Introductionmentioning

confidence: 99%

Cross-sections of photoneutron reactions on $^{181}$Ta at $e_{\rm γmax}$ up to 95 MeV

Deiev,

Timchenko,

Olejnik

et al. 2021

Preprint

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The total bremsstrahlung flux-averaged cross-sections σ(Eγmax) for the photonuclear reactions 181 Ta(γ, xn; x ≤ 8) 181−x Ta have been measured in the range of end-point energies Eγmax up to 95 MeV. The experiments were performed with the beam from the NSC KIPT electron linear accelerator LUE-40 with the use of the activation and off-line γ-ray spectrometric technique. The calculation of average cross-sections was carried out using the cross-section values computed with the TALYS1.95 code for different level density models LD 1-6. A comparison between the experimental total cross-sections σ(Eγmax) and the theoretical values has shown satisfactory agreement for the 181 Ta(γ, xn) reactions with the escape of 1-4, 6 and 7 neutrons. The closest agreement with the measured data is observed with the LD5 computation version, which represents the microscopic level density model taking into account Hilaire's combinatorial tables.

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CoH3: The Coupled-Channels and Hauser-Feshbach Code

Cited by 17 publications

References 31 publications

Energy Dependent Calculations of Fission Product, Prompt, and Delayed Neutron Yields for Neutron Induced Fission on $^{235}$U, $^{238}$U, and $^{239}$Pu

Energy Dependent Calculations of Fission Product, Prompt, and Delayed Neutron Yields for Neutron Induced Fission on $^{235}$U, $^{238}$U, and $^{239}$Pu

IAEA Photonuclear Data Library 2019

Cross-sections of photoneutron reactions on $^{181}$Ta at $e_{\rm γmax}$ up to 95 MeV

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