Neutron Scattering Cross Sections for 232Th, 233U, 235U, 238U, 239Pu, and 242PU Between 0.6 and 3.4 MeV

Haouat, G.; Lachkar, J.; Lagrange, Ch.; Jary, J.; Sigaud, J.; Patin, Y.

doi:10.13182/nse82-a21439

Cited by 87 publications

(20 citation statements)

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“…By analyzing the transmission coefficients leading to various angular momenta in the compound nucleus, the fact that calculation significantly underpredicts excitation to the 4 + state is an indication that opticalpotential parameters might need to be refined in order to increase the l = 3 transmission coefficient at low incident energies, or that there is a problem with the experimental data for this case. We note that the Soukhovitskii potential as well as the potential described in [11] show a similar underprediction. This issue is not understood at present.…”

Section: Inelastic Scatteringsupporting

confidence: 52%

“…The best experimental data can test these libraries, and the results obtained from the two modern optical potentials Soukhovitskii and FLAP-A2.99d are now compared with the data of Smith [10] and Haouat et al [11]. We show in Figure and ENDL2009, the angular distributions were obtained using PYTHON routines written by Bret Beck to interpolate the tabulated data to the energies corresponding to experiment.…”

Section: Elastic Angular Distributionsmentioning

confidence: 99%

“…At higher energies, we turn to the data of Haouat et al [11], which is shown in Figure 6 where the experimental differential cross section dσ/dΩ at E n = 0.7, 1.5, 2.5, and 3.4 MeV is compared with ENDL99, ENDL2009, and the FLAP-A2.99d potential. At E n =0.7 MeV, the comparison with the Haouat data is similar as with the Smith data; ENDL99 is in slightly better agreement with experiment.…”

Section: Elastic Angular Distributionsmentioning

confidence: 99%

“…These are compared with experimental data [11] for incident neutron energies of 0.7, 1.5, 2.5, and 3.4 MeV.…”

Section: Inelastic Scatteringmentioning

confidence: 99%

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Analysis of differences in the ENDL99 and ENDL2009 nuclear data libraries pertaining to 238U

Ormand¹,

Beck²,

Thompson³

et al. 2012

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A careful analysis is performed on the differences exhibited in the evaluated elastic and inelastic channels between the ENDL99 and ENDL2009 libraries for neutrons incident on 238 U. The two libraries are compared with experimental data as well as results obtained from calculations utilizing a new Hauser-Feshbach reaction code and two modern, high-quality optical potentials. Overall, the ENDL2009 evaluation is found to be more physical, and a better representation of experimental data. The only exception is that the angular distributions for the elastic channel in the ENDL99 library are in better agreement at backward angles for incident neutron energies in the range 0.7-1.3 MeV. Other issues with the inelastic scattering data in ENDL2009 are pointed out.

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Section: Inelastic Scatteringsupporting

confidence: 52%

Section: Elastic Angular Distributionsmentioning

confidence: 99%

Section: Elastic Angular Distributionsmentioning

confidence: 99%

“…These are compared with experimental data [11] for incident neutron energies of 0.7, 1.5, 2.5, and 3.4 MeV.…”

Section: Inelastic Scatteringmentioning

confidence: 99%

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Analysis of differences in the ENDL99 and ENDL2009 nuclear data libraries pertaining to 238U

Ormand¹,

Beck²,

Thompson³

et al. 2012

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“…One can expect that non-GS bands will saturate at lower spins than GS-band since experimentally the measured sum of GS band levels 2 + and 4 + excitations (≈ 0.45 b at its maximum around 2 MeV [31]) is about ten times larger than the excitation of the most strongly populated octupolar band (≈ 0.045 b at its maximum around 6 MeV) (see Fig. 2).…”

Section: Resultsmentioning

confidence: 97%

Saturation of coupling of collective levels in optical model calculations of even-even actinides

et al. 2017

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Abstract. Saturation of the coupling-scheme is studied in dispersive optical model calculations of nucleon induced reactions on 238 U target. Recently derived potential that is based on a soft-rotator-model (SRM) description of the collective levels of the target nucleus with volume conservation is used. It is show that calculated direct excitation cross sections of all considered non-GS bands levels are larger than the 4 + GS band level excitation, and can't be ignored in coupled-channel calculations. SRM couplings of 21 levels constitute a saturated coupling scheme that allows a precise calculation of the compound-nucleus (CN) formation cross sections up to several MeV.

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Nuclear Models Relevant to Evaluation

Arthur

Chadwick

Hale

et al. 1992

Nuclear Data for Science and Technology

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The widespread use of nuclear models continues in Ihe creation of data evaluations. The reasons include exte~ion of data evaluations IO higher energies, creation of data libraries for isoropic components of narura.i marerials, and production of evaluations for mdioactive trrget species. In these cases, ex~rirnental dam am often sparse or nonexistem. As LIti trend continues, the nuclear mmlels employed in evaluation work move rowarcts more microscopictiy-based theoretical methods, prompted in part by the availability of increasingly powerfuJ carnputational resources.Advances m nuclear models applicable to evaluation w W be reviewed. 'fhese include advances in optical model heo~, microscopic and phenomenological slate and level density theory, unikd modch that consisterrdy describe W equilibrium and nonequilibrium reaction mechanisms, and improved methodologies for calculation of prompt radiation from fsssion. LuufdwltMReviews by Uld [I], Gardner [2], and Young [31 at earlier intem~rional nuclear data conferences have stressed the increucd arrd imporrmt role that nuclcds models play in the provbion of daia for a variery of applications. This crec ontinues with~heorelical calculations r~resenling a ma 'or J component required for development of evaluated data f es for ENDF-VI, JENDL, JEP, and rho BROND libraries, These dma systems have expanded their scopo beyond the irrcorporatlon of neutron-induced reaction dm for energies blow 2L .MeV, Extensions include provision of reaction data for incident charged-particles and higher energy data, In r.hesc extensions, nuclear models have played a signiflcam and major role.Applications such as nuclear wute transmutation, radiwion protection for manned spsce exploration, and radiotherapy involving energetic n .Ieon

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Neutron Scattering Cross Sections for ²³²Th, ²³³U, ²³⁵U, ²³⁸U, ²³⁹Pu, and ²⁴²PU Between 0.6 and 3.4 MeV

Cited by 87 publications

References 0 publications

Analysis of differences in the ENDL99 and ENDL2009 nuclear data libraries pertaining to 238U

Analysis of differences in the ENDL99 and ENDL2009 nuclear data libraries pertaining to 238U

Saturation of coupling of collective levels in optical model calculations of even-even actinides

Nuclear Models Relevant to Evaluation

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