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

Kunieda, Satoshi; Chiba, Satoshi; Shibata, Kozo; Ichihara, Akira; Sukhovitskiĩ, Efrem Sh.

doi:10.1051/ndata:07402

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…[9] and references therein). Progress has been also achieved in the development of the dispersive OMPs for the positive-energy domain that describe nucleon scattering using both spherical [10] and coupled-channels formalism [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Sun

Soukhovitskiĩ

et al. 2013

Phys. Rev. C

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An approximate Lane-consistent dispersive coupled-channels optical potential is derived that describes nucleon-induced reactions on even iron isotopes. Realistic saturated couplings for 54,56,58 Fe nuclei are built using nuclear wave functions of the soft-rotator model with the Hamiltonian parameters adjusted to reproduce the energy of the low-lying collective levels of these isotopes. E2-and E3-transition probabilities between low-lying collective levels are well reproduced. The comprehensive experimental database used in the fitting process includes all scattering data for neutron and proton scattering up to 200 MeV on iron nuclei. The derived potential is shown to be applicable to Ni and Cr isotopes, assuming the applicability of the soft-rotator model to these nuclei and to the odd 57 Fe nucleus within the rigid-rotor model. The approximate Lane consistency of the derived potential is validated by describing the quasielastic (p, n) scattering with excitation of isobaric analog states. Elastic and inelastic analyzing powers for both neutron-and proton-induced reactions are shown to be in good agreement with experimental data, demonstrating the reliability of the derived dispersive spin-orbit potential.

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Section: Introductionmentioning

confidence: 99%

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Sun

Soukhovitskiĩ

et al. 2013

Phys. Rev. C

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“…In all calculations described in the present work the global deformed optical potential from Ref. [26] was adopted to calculate the neutron transmission coefficients. The coupled-channels calculation was performed with the deformation parameters taken from the finite range droplet model [27].…”

Section: Discussionmentioning

confidence: 99%

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

et al. 2016

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Background: In (n, n ′ ) reactions on stable Ir and Au isotopes in the mass A = 190 region the experimentally established feeding of the isomers relative to the feeding of the corresponding ground states increases with increasing neutron energy up to the neutron energy where the (n, 2n) reaction channel opens up and then decreases.Purpose: In order to check for similar behavior in the mass A = 100 region the feeding of isomers and ground states in fast-neutron-induced reactions on stable isotopes in this mass region was studied. This is of especial interest for Rh which can be used as a radiochemical detector.Methods: Excited states were studied using the (n, n ′ γ), (n, 2nγ) and (n, 3nγ) reactions on 103 Rh and 109 Ag. A germanium-detector array for γ-ray detection and the broad-spectrum pulsed neutron source of the Los Alamos Neutron Science Center's Weapons Neutron Research facility were used for the measurement. The energy of the incident neutrons was determined using the time-of-flight technique.Results: Absolute partial γ-ray cross sections were measured for 57 transitions feeding isomers and ground states in 101,102,103 Rh and 107,108,109 Ag. The feeding of the isomers was found to be very similar in the corresponding reaction channels and it is compared to the feeding determined for the ground states. Conclusions:The opening of reaction channels at higher neutron energies removes angular momentum from the residual nucleus and reduces the population of the higher-spin isomers relative to the feeding of the lower-spin ground states. Similar behavior was observed in the mass A = 190 region in the feeding of higher-spin isomers, but the reverse behavior was observed in 176 Lu with a lower-spin isomer and a higher-spin ground state.PACS numbers: PACS number(s): 25.40.-h, 28.20.-v, 24.10.-i, 25.40.Fq * fotia@lanl.gov 2

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“…[6]. For 129 I the coupled-channels optical model based on the rigid rotator model was adopted with the potential form of Kunieda et al [7] for target nucleus. The coupled levels were taken from the Evaluated Nuclear Structure Data File (ENSDF) [8].…”

Section: Evaluation Methodsmentioning

confidence: 99%

Evaluation of Neutron Capture Cross Sections and Covariances on⁹⁹Tc and¹²⁹I in the keV Energy Region

Iwamoto

2016

EPJ Web of Conferences

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Abstract. Neutron capture cross sections and covariances on radioactive 99 Tc and 129 I have been required for developing environmental load-reducing technology. Their evaluation was performed by using nuclear reaction calculation code CCONE and Baysian code KALMAN with data assumed on the basis of measured data. The obtained total and capture cross sections are in good agreement with the measured data. The resulting uncertainties of capture cross section were 12-18% and 20-29% for 99 Tc and 129 I, respectively, in the keV energy region.

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

Cited by 7 publications

References 8 publications

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Evaluation of Neutron Capture Cross Sections and Covariances on⁹⁹Tc and¹²⁹I in the keV Energy Region

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

Cited by 7 publications

References 8 publications

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Dispersive coupled-channels optical-model potential with soft-rotator couplings for Cr, Fe, and Ni isotopes

Feeding of Rh and Ag isomers in fast-neutron-induced reactions

Evaluation of Neutron Capture Cross Sections and Covariances on99Tc and129I in the keV Energy Region

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Evaluation of Neutron Capture Cross Sections and Covariances on⁹⁹Tc and¹²⁹I in the keV Energy Region