Evaluation of the 232Th Neutron Cross Sections between 4 keV and 140 keV

Volev, K.; Koyumdjieva, N.; Brusegan, A.; Borella, A.; Siegler, P.; Janeva, N.; Luk'yanov, A. A.; Leal, L.C.; Schillebeeckx, P.

doi:10.1063/1.1944963

Cited by 4 publications

(10 citation statements)

References 10 publications

(21 reference statements)

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“…These values compared favorably with the NDOMP04 values, which are 1.66 (2.55) and 1.90 (3.8) for neutron and proton databases, respectively. One can see that the χ 2 value is slightly increased for 238 U and decreased for 232 Th, probably because a new accurate Geel's group data [37] was used in the optical parameter search for the latter.…”

Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

“…Additional average total cross-section data for 232 Th in the unresolved resonance region from 1 up to 140 keV were recently obtained by Geel's group [37]. The total cross-section data considered cover all the critical energy points that are necessary for revealing the structure that is due to the Ramsauer effect.…”

Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

“…Thus experimental proton-scattering data, which can be done with much higher resolution, were highly relevant for determining the optical potential parameters uniquely. Evaluated neutron strength functions for 232 Th and 238 U, S 0 and S 1 , and potential scattering radius R [37,38] were used in parameter search.…”

Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

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Is a global coupled-channel dispersive optical model potential for actinides feasible?

et al. 2005

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An isospin-dependent coupled-channel optical model potential containing a dispersive term with a nonlocal contribution is used to simultaneously fit the available experimental database (including strength functions and scattering radius) for neutron and proton scattering on strongly deformed 238 U and 232 Th nuclei. The energy range 0.001-200 MeV is covered. A dispersive coupled-channel optical model (DCCOM) potential with parameters that show a smooth energy dependence and energy-independent geometry are determined from fits to the entire data set. Calculations using the obtained DCCOM potential reproduce measured total cross-section differences between 232 Th and 238 U within experimental uncertainty. The isovector terms and the observed very weak dependence of the geometrical parameters on mass number A allow us to extend the derived potential parameters to neighboring actinide nuclei with great confidence.

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Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

Section: Summary Of the Experimental Databases And Parameter Fitmentioning

confidence: 99%

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Is a global coupled-channel dispersive optical model potential for actinides feasible?

et al. 2005

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“…Additional average total cross-section data in the unresolved resonance region from 1 up to 140 keV were recently measured by IRMM's group [35]. Energy-averaged total cross sections σ T were obtained from Abfalterer et al [34] from 5 to 200 MeV.…”

Section: A Summary Of the Experimental Databasesmentioning

confidence: 99%

“…Average total cross section data in the unresolved resonance region were derived by IRMM's group in 2004 [35]. These high-precision data together with earlier nucleon scattering angular distributions and low-energy observables (strength functions and scattering radius) are the database considered at positive energies.…”

Section: Introductionmentioning

confidence: 99%

Dispersive coupled-channel analysis of nucleon scattering fromTh232up to 200 MeV

et al. 2005

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An isospin-dependent coupled-channels optical model potential containing a dispersive term (including nonlocal contribution) is used to simultaneously fit the available experimental database (including strength functions and scattering radius) for neutron and proton scattering on strongly deformed 232 Th nucleus. The energy range 0.001-200 MeV is covered. A dispersive coupled-channel optical model potential with parameters that show a smooth energy dependence and energy independent geometry are determined from fits to the entire data set. Dispersive contribution is shown to be the dominant Coulomb correction to the proton real potential below the Coulomb barrier. Inclusion of nonlocality effects in the absorptive volume potential and its corresponding dispersive contribution to the real potential is needed to achieve an excellent agreement above 100 MeV.

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Resonance Analysis in the Region of Unresolved Resonances

Luk'yanov¹,

Koyumdjieva²,

Janeva³

et al. 2005

AIP Conference Proceedings

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The independent analysis of new experimental data for 232 Th cross sections in the unresolved region performed on the basis of the existing scheme and method of evaluation confirm the previously obtained average resonance parameters. The method of statistical modeling of the resonant cross-section structure in the unresolved resonance region, proposed and developed earlier by introducing the characteristic function of R-matrix elements distribution and the presentation of this by a ladder of fixed "resonances," is used for calculation of the self-shielding factors of 232 Th. The results are given in comparison with those of the code NJOY and experimental data.

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Evaluation of the 232Th Neutron Cross Sections between 4 keV and 140 keV

Cited by 4 publications

References 10 publications

Is a global coupled-channel dispersive optical model potential for actinides feasible?

Is a global coupled-channel dispersive optical model potential for actinides feasible?

Dispersive coupled-channel analysis of nucleon scattering fromTh232up to 200 MeV

Resonance Analysis in the Region of Unresolved Resonances

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