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JAEA Reports

Deduced soft-rotator model Hamiltonian parameters and collective properties of medium-to-heavy even-even nuclei

Kunieda, Satoshi; Chiba, Satoshi; Shibata, Keiichi; Ichihara, Akira; Iwamoto, Osamu; Iwamoto, Nobuyuki; Fukahori, Tokio; Sukhovitskij, E.*

JAEA-Research 2010-053, 59 Pages, 2011/02

JAEA-Research-2010-053.pdf:1.24MB

The soft-rotator model Hamiltonian parameters were deduced for 63 even-even medium and heavy nuclei in a mass range $$56 leq A leq 238$$. 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.

Journal Articles

Extensive study of the soft-rotator model Hamiltonian parameters for medium and heavy even-even nuclei

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 $$56 leq A leq 238$$ 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 $$B(E2)$$ and $$B(E3)$$ 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.

Journal Articles

Systematical nucleon-induced optical model analysis for medium and heavy nuclei with coupled-channel framework

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.

Journal Articles

Coupled-channels optical model analyses of nucleon-induced reactions for medium and heavy nuclei in the energy region from 1 keV to 200 MeV

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:68 Percentile:36.59(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.

Journal Articles

Coupled-channels analysis of nucleon interaction data of $$^{28,30}$$Si up to 200 MeV based on the soft rotator model

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:9 Percentile:43.87(Nuclear Science & Technology)

A consistent analysis for nuclear level structure and nucleon scattering data up to 200 MeV were performed for sd-shell nuclei, $$^{28,30}$$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.

Journal Articles

Analysis of nucleon scattering data of $$^{52}$$Cr with a coupling scheme built with the soft-rotator model

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:7 Percentile:51.57(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Nuclear level structure, B(E2) $$gamma$$-transitions and nucleon interaction data for $$^{56}$$Fe by a unified soft-rotator model and coupled-channels framework

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:12 Percentile:36.19(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 $$^{56}$$Fe. The model could describe the experimental collective levels of $$^{56}$$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) $$gamma $$ - transitions were described satisfactorily.

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