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Journal Articles

Systematics and uncertainties of Hamiltonian parameters of soft-rotator model for actinides and their implications for nuclear data calculations

Chiba, Satoshi; Koura, Hiroyuki; Maruyama, Toshiki; Kunieda, Satoshi; Soukhovitskij, E. Sh.*

Proceedings of International Conference on Nuclear Data for Science and Technology (ND 2007), Vol.1, p.305 - 308, 2008/06

 Times Cited Count:0 Percentile:100

A coupled-channel (CC) method based on the soft-rotator model (SRM) wave functions, SRM-CC, has been recognized as a powerful tool to calculate, estimate and evaluate the nucleon-induced cross sections. It is because that this method can take account of the information from the nuclear structure and reaction studies simultaneously. For example, the coupling strengths required in the coupled-channel calculation is determined from analyses of low-lying collective level structure of target nuclei. However, nobody has looked into so far how the uncertainties of the SRM parameters affects the calculated cross section data. In this work, collective level structure of 19 even-even actinide nuclei are analyzed in terms of the soft-rotator model (SRM). Hamiltonian parameters of SRM to describe the low-lying level scheme and their uncertainties are obtained. Systematic trends are found for major Hamiltonian parameters as a function of ground-state quadrupole deformation which are important to estimate low-lying level structure of other e-e nuclei for which level structure is unknown or only partly known. Then, those parameters and their uncertainties are used to calculate neutron cross sections and their covariance of actinides in terms of SRM-CC. Furthermore, effects of side-band coupling is investigated. Especially, effects of coupling are noticeable for low-energy observables, e.g., strength functions. Such saturated calculations are not possible in RRM (rigid rotor model)-CC approach, making SRM-CC an effective method for investigations of reaction mechanisms and nuclear data evaluation.

Journal Articles

A Global dispersive coupled-channel optical model potential for actinides

Capote, R.*; Chiba, Satoshi; Soukhovitskij, E. Sh.*; Quesada, J. M.*; Bauge, E.*

Journal of Nuclear Science and Technology, 45(4), p.333 - 340, 2008/04

 Times Cited Count:38 Percentile:6.46(Nuclear Science & Technology)

A global dispersive coupled-channel optical model (DCCOM) potential is proposed to describe neutron and proton interactions with actinide nuclei at 0.001 to 200 MeV range. A linear dependence of the geometrical parameters on mass number $$A$$ is employed, and deformation parameters are adjusted for each nucleus to extend the DCCOM determined previously for $$^{238}$$U and $$^{232}$$Th to neighboring nuclei, $$^{241}$$Am, $$^{242,240,239}$$Pu and $$^{235,233}$$U. Fitted deformations are in reasonable agreement with those derived theoretically. The present DCCOM is capable of describing not only the cross sections but also the total cross section differences between $$^{232}$$Th and $$^{238}$$U up to 200 MeV within experimental uncertainty, verifying that the isovector potential and assumed geometrical parameters are adequate to describe the minute difference of the cross sections of actinide nuclei and its energy dependence.

Journal Articles

Angular distributions of protons scattered by $$^{40}$$Ar nuclei with excitation of the 2$$^{+}$$ (1.46 MeV) and 3$$^{-}$$ (3.68 MeV) collective levels for incident energies of 25.1, 32.5, and 40.7 MeV

Okumusoglu, N. T.*; Gorur, F. K.*; Birchall, J.*; Soukhovitskij, E. Sh.*; Capote, R.*; Quesada, J. M.*; Chiba, Satoshi

Physical Review C, 75(3), p.034616_1 - 034616_10, 2007/03

 Times Cited Count:3 Percentile:68.48(Physics, Nuclear)

Elastic and inelastic scattering of unpolarized and polarized protons by $$^{40}$$Ar nuclei for incident energies between 20 and 50 MeV has been studied by reanalyzing experimental scattering spectra for the 2$$^{+}$$ (1.46 MeV) and 3$$^{-}$$ (3.68 MeV) levels in the angular range 30$$^{circ}$$ - 160$$^{circ}$$ for incident protons of energies of 25.1, 32.5, and 40.7 MeV. An isospin dependent soft-rotator coupled channels optical model with the potential containing a dispersive term with a nonlocal contribution is used to analyze the data.

Journal Articles

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

Capote, R.*; Soukhovitskij, E. Sh.*; Quesada, J. M.*; Chiba, Satoshi

Physical Review C, 72(6), p.064610_1 - 064610_6, 2005/12

 Times Cited Count:42 Percentile:8.75(Physics, Nuclear)

no abstracts in English

Journal Articles

Dispersive coupled-channel analysis of nucleon scattering from $$^{232} $$Th up to 200 MeV

Soukhovitskij, E. Sh.*; Capote, R.*; Quesada, J. M.*; Chiba, Satoshi

Physical Review C, 72(2), p.024604_1 - 024604_12, 2005/08

 Times Cited Count:55 Percentile:6.15(Physics, Nuclear)

Lane consistent coupled channels optical model potential (OMP) 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 (DCCOM) 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.

JAEA Reports

Programs OPTMAN and SHEMMAN, 8; 2004

Soukhovitskij, E. Sh.*; Chiba, Satoshi; Iwamoto, Osamu; Shibata, Keiichi; Fukahori, Tokio; Morogovskij, G. B.*

JAERI-Data/Code 2005-002, 78 Pages, 2005/03

JAERI-Data-Code-2005-002.pdf:7.7MB

no abstracts in English

JAEA Reports

Physics and numerical methods of OPTMAN; A Coupled-channels method based on soft-rotator model for a description of collective nuclear structure and excitations

Soukhovitskij, E. Sh.*; Morogovskij, G. B.*; Chiba, Satoshi; Iwamoto, Osamu; Fukahori, Tokio

JAERI-Data/Code 2004-002, 32 Pages, 2004/03

JAERI-Data-Code-2004-002.pdf:1.43MB

This report gives a detailed description of the theory and computational algorithms of modernized coupled-channels optical model code OPTMAN based on the soft-rotator model for the collective nuclear structure and excitations. This work was performed under the Project Agreement B-521 with the International Science and Technology Center (Moscow), financing party of which is Japan. As a result of this work, the computational method of OPTMAN was totally updated, and an user-friendly interface was attached.

Journal Articles

Soft-rotator model and coupled-channels approach for consistent description of the nuclear collective levels and their excitation by nucleons

Soukhovitskij, E. Sh.*; Chiba, Satoshi

Journal of Nuclear Science and Technology, 39(Suppl.2), p.697 - 702, 2002/08

Coupled-channels optical model approach built on the wave functions of the soft-rotator nuclear Hamiltonian is applied for the self-consistent analyses of the low-lying collective nuclear level structure and nucleon interaction with even-even nuclei in a wide $$A$$- mass region. It succeeds to describe available experimental data and $$B(Elambda )$$ $$gamma$$ - transitions with reasonable accuracy. Along with the account of the global optical potential form and relativistic kinematics, present method was proved to be a powerful tool for studies of nucleon-induced reaction data.

Oral presentation

Evaluation of FP nuclear data for JENDL-4, 2; Optical model analysis

Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Soukhovitskij, E. Sh.*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of FP nuclear data for JENDL-4, 4; Global analysis by using the soft-rotator model

Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Soukhovitskij, E. Sh.*

no journal, , 

no abstracts in English

Oral presentation

Collective level structure and neutron cross sections of actinides by SRM-CC

Chiba, Satoshi; Koura, Hiroyuki; Kunieda, Satoshi; Soukhovitskij, E. Sh.*

no journal, , 

no abstracts in English

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