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Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Iwamoto, Osamu; Iwamoto, Nobuyuki; Fukahori, Tokio; Sukhovitskij, E.*
JAEA-Research 2010-053, 59 Pages, 2011/02
The soft-rotator model Hamiltonian parameters were deduced for 63 even-even medium and heavy nuclei in a mass range . We obtained those values by the combination of the low-lying level structure and the coupled-channels proton scattering analyses. It was found that the values of the effective quadrupole and octupole deformations obtained were consistent with those derived from experimental data. Besides, the equilibrium ground-state quadrupole deformation parameters were also in reasonable accord with the theoretical mass-models results for deformed heavy nuclei. In this report, we present a complete set of the Hamiltonian parameters for each nucleus. The obtained values of the parameters often varied with the constituent neutron and/or proton numbers anomalously. On the other hand, some clear systematic trends were seen among the major Hamiltonian parameters.
Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Iwamoto, Osamu; Iwamoto, Nobuyuki; Fukahori, Tokio; Sukhovitskij, E.*
Journal of Nuclear Science and Technology, 46(9), p.914 - 924, 2009/09
The soft-rotator model Hamiltonian parameters were deduced for 63 even-even nuclei in a mass range by a combination of the low-lying level structure and the coupled-channels proton scattering analyses toward a systematic and accurate calculation of nuclear data. It was found that obtained effective quadrupole and octupole deformation parameters were consistent with those derived from experimental and data. Besides, the equilibrium ground-state quadrupole deformation parameters were also in reasonable accord with theoretical results for deformed heavy nuclei. The obtained parameters often varied with the neutron and/or proton numbers anomalously, showing mostly effects of the shell closure. On the other hand, some clear systematic trends were seen among the major Hamiltonian parameters.
Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Sukhovitskij, E.*
Proceedings of International Conference on Nuclear Data for Science and Technology (ND 2007), Vol.1, p.227 - 230, 2008/05
The optical model analyses were carried out for nucleon-induced reactions on medium and heavy nuclei from 1 keV to 200 MeV. The coupled-channels method based on the rigid-rotator model was employed as an initial approach. It was found that the coupled-channels analyses were indispensable to obtain a global formulation of optical potential. In addition to this, the coupled-channels calculations based on the soft-rotator model was applied to analyses for various even-even fission product isotopes. They reproduced measured cross sections better than the rigid-rotator model in many cases. Though the latter is our ongoing study, we show the advantage of coupled-channels calculations and the applicability of the soft-rotator model in this conference.
Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Sukhovitskij, E.*
Journal of Nuclear Science and Technology, 44(6), p.838 - 852, 2007/06
Times Cited Count:77 Percentile:68.29(Nuclear Science & Technology)Optical model analyses were carried out using the coupled-channels method over various medium and heavy nuclei for incident neutrons and protons in the energy region from 1 keV to 200 MeV. Global systematics was consequently obtained for the optical potential parameters with simple functional forms. It was confirmed that coupld-channels analyses were indispensable to achieve a global description of experimental data. In this study, we have obtained a new global parameter set applicable to a wide range of energy and mass number. It is found that the parameter set obtained is very useful for nuclear data evaluations of fission-product nuclei for which available experimental data are scarce.
Sun, W.*; Watanabe, Yukinobu*; Sukhovitskij, E.*; Iwamoto, Osamu; Chiba, Satoshi
Journal of Nuclear Science and Technology, 40(9), p.635 - 643, 2003/09
Times Cited Count:10 Percentile:56.31(Nuclear Science & Technology)A consistent analysis for nuclear level structure and nucleon scattering data up to 200 MeV were performed for sd-shell nuclei, Si, using a unified framework of soft-rotator model and coupled-channels approach. The soft-rotator model parameters and optical model parameters were derived. The calculations showed good agreement with experimental data for both collective level and nucleon interaction data -- neutron total cross sections, proton reaction cross sections, and nucleon scattering angular distributions.
Sukhovitskij, E.*; Chiba, Satoshi; Lee, J.*; Kim, B.*; Hong, S.*
Journal of Nuclear Science and Technology, 40(2), p.69 - 76, 2003/02
Times Cited Count:8 Percentile:49.75(Nuclear Science & Technology)no abstracts in English
Sukhovitskij, E.*; Chiba, Satoshi; Lee, J.*; Lee, Y.*; Chang, J.*; Maruyama, Toshiki; Iwamoto, Osamu
Journal of Nuclear Science and Technology, 39(8), p.816 - 826, 2002/08
Times Cited Count:13 Percentile:63.24(Nuclear Science & Technology)The soft-rotator model (SRM) and a coupled-channels method based on the oupling scheme based on the wave functions of the SRM were applied for a self-consistent analyses of the nuclear level structure, B(E2) and the nucleon interaction data of Fe. The model could describe the experimental collective levels of Fe up to the excitation energy of 5.5 MeV successfully. Relativistic kinematics and global optical potential form, consistent with the shell model, dispersion relationship and Dirac phenomenology, were used in coupled-channels optical model approach to overcome problems left in our previous work. The available nucleon interaction experimental data up to 160 MeV and B(E2) - transitions were described satisfactorily.