Chinese Physics C > 2017, Vol. 41 > Issue(9): 094105 DOI: 10.1088/1674-1137/41/9/094105

Predicting the optical observables for nucleon scattering on even-even actinides

1.
Joint Institute for Energy and Nuclear Research, 220109, Minsk-Sosny, Belarus
2.
NAPC-Nuclear Data Section, International Atomic Energy Agency, Vienna A-1400, Austria
3.
Departamento de Fí
4.
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology 2-12-1-N1-9 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

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Abstract：
The previously derived Lane consistent dispersive coupled-channel optical model for nucleon scattering on ²³²Th and ²³⁸U nuclei is extended to describe scattering on even-even actinides with Z=90-98. A soft-rotator-model (SRM) description of the low-lying nuclear structure is used, where the SRM Hamiltonian parameters are adjusted to the observed collective levels of the target nucleus. SRM nuclear wave functions (mixed in Kquantum number) have been used to calculate the coupling matrix elements of the generalized optical model. The "effective" deformations that define inter-band couplings are derived from the SRM Hamiltonian parameters. Conservation of nuclear volume is enforced by introducing a dynamic monopolar term to the deformed potential, leading to additional couplings between rotational bands. The fitted static deformation parameters are in very good agreement with those derived by Wang and collaborators using the Weizsäcker-Skyrme global mass model (WS4), allowing use of the latter to predict cross sections for nuclei without experimental data. A good description of the scarce " optical" experimental database is achieved. SRM couplings and volume conservation allow a precise calculation of the compound-nucleus formation cross sections, which is significantly different from that calculated with rigid-rotor potentials coupling the ground-state rotational band. The derived parameters can be used to describe both neutron-and proton-induced reactions.
- double beta decay,
- liquid scintillator,
- JUNO

References

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D. S. Martyanov, E. Sh. Soukhovitskí, R. Capote, J. M. Quesada and S. Chiba. Predicting the optical observables for nucleon scattering on even-even actinides[J]. Chinese Physics C, 2017, 41(9): 094105. doi: 10.1088/1674-1137/41/9/094105

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Received: 2017-06-01

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Supported by International Atomic Energy Agency, through the IAEA Research Contract 19263, by the Spanish Ministry of Economy and Competitivity under Contracts FPA2014-53290-C2-2-P and FPA2016-77689-C2-1-R.

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通讯作者:陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Predicting the optical observables for nucleon scattering on even-even actinides

1. Joint Institute for Energy and Nuclear Research, 220109, Minsk-Sosny, Belarus

2. NAPC-Nuclear Data Section, International Atomic Energy Agency, Vienna A-1400, Austria

3. Departamento de Fí

4. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology 2-12-1-N1-9 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Received Date:2017-06-01

Available Online:2017-09-05

Fund Project:Supported by International Atomic Energy Agency, through the IAEA Research Contract 19263, by the Spanish Ministry of Economy and Competitivity under Contracts FPA2014-53290-C2-2-P and FPA2016-77689-C2-1-R.

Abstract:The previously derived Lane consistent dispersive coupled-channel optical model for nucleon scattering on²³²Th and²³⁸U nuclei is extended to describe scattering on even-even actinides withZ=90-98. A soft-rotator-model (SRM) description of the low-lying nuclear structure is used, where the SRM Hamiltonian parameters are adjusted to the observed collective levels of the target nucleus. SRM nuclear wave functions (mixed inKquantum number) have been used to calculate the coupling matrix elements of the generalized optical model. The "effective" deformations that define inter-band couplings are derived from the SRM Hamiltonian parameters. Conservation of nuclear volume is enforced by introducing a dynamic monopolar term to the deformed potential, leading to additional couplings between rotational bands. The fitted static deformation parameters are in very good agreement with those derived by Wang and collaborators using the Weizsäcker-Skyrme global mass model (WS4), allowing use of the latter to predict cross sections for nuclei without experimental data. A good description of the scarce " optical" experimental database is achieved. SRM couplings and volume conservation allow a precise calculation of the compound-nucleus formation cross sections, which is significantly different from that calculated with rigid-rotor potentials coupling the ground-state rotational band. The derived parameters can be used to describe both neutron-and proton-induced reactions.

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Predicting the optical observables for nucleon scattering on even-even actinides

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