Parameter Determination and Application to Nuclear Model Calculations of Neutron-Induced Reactions on Yttrium and Zirconium Isotopes

Arthur, E.D.

doi:10.13182/nse80-a19446

Cited by 16 publications

(9 citation statements)

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“…Of course, they did not reproduce either the fine or intermediate resonance structure evident at low energies. The parameters of Table 3 are reasonably consistent with those recently reported for yttrium by Arthur [32]. The geometric factors differ but the strengths of the two potentials, measured as The absorption radius is relatively large, a characteristic encountered in potentials derived from lowenergy strength-function data [34].…”

Section: Physical Interpretation and Modelingsupporting

confidence: 86%

Neutron total, scattering and inelastic Gamma-ray cross sections of yttrium at few MeV energies

et al. 1984

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Neutron total, scattering and (n; n',V) cross sections of elemental yttrium (89y) were measured in the few-MeV region. The neutron total-cross-section measurements were made with broad resolutions from ~0.5 to 4.2MeV in steps of <0.1MeV. Neutron elastic-and inelastic-scattering cross sections were measured from ~1.5 to 4.0MeV, at incident-neutron energy intervals of ~50keV and at ten or more scattering angles distributed between 20 and 160 degrees using neutron detection. Inelastic-scattering cross sections were also determined using the (n; n', ~) reaction at incident energies from 1.6 to 3.8 MeV at intervals of 0.1 MeV. Gamma-rays and/or inelastically-scattered neutrons were observed corresponding to the excitation of levels at: 909.0_+0.5, 1,507.4 +0.3, 1,744.5+0.3, 2,222.6_+0.5, 2,530_+0.8, 2,566.4_+1.0, 2,622.5+_1.0, 2,871.9_+1.5, 2,880. 6_+2.0, 3,067.0_+2.0, 3,107.0_+2.0, 3,140.0_+2.0, 3,410.0+2.0, 3,450.0_+2.0, 3,504.0 _+1.5, 3,514.0_+2.0, 3,556.0+_2.0, 3,619.0+3.0, 3,629.0_+3.0 and 3,715.0 _+ 3.0 keV. The experimental results are discussed in terms of the spherical-optical-statistical, coupledchannels, and core-coupling models, and in the context of previously reported excitedlevel structure.Nuclear Reactions: Measured at(n ) 0.5 to 4.2MeV, da(n)/df2 and d~r(n')/df2 1.5 to 4.0 MeV, and a(n; n', V) 1.6 to 3.8 MeV for elemental yttrium. Spherical-optical-statistical, coupled-channels and core-coupling models and level structure discussed.

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Section: Physical Interpretation and Modelingsupporting

confidence: 86%

Neutron total, scattering and inelastic Gamma-ray cross sections of yttrium at few MeV energies

et al. 1984

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“…The prior form distortedwave transition amplitudes, and the finite-range interaction have been considered. The p-3 H as well as n- 3 He effective interaction in the α particle are assumed to have a Gaussian shape [100,103,104]:…”

Section: Pickup D I Modelingmentioning

confidence: 99%

“…However, there are also various assumptions and parameters of these models in addition to the α-nucleus potential. Thus, a definite conclusion on α-potential may become possible only using HF+PE consistent parameter sets already validated by analysis of other independent data (e.g., [3]), that are distinct from either α-induced reaction or especially α-emission data.…”

Section: Introductionmentioning

confidence: 99%

Validation of an optical potential for incident and emitted low-energy $$\alpha $$-particles in the $$A\sim 60$$ mass range

Avrigeanu

2021

Eur. Phys. J. A

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A consistent set of statistical-model input parameters, validated by analysis of various independent data, makes possible the assessment of an $$\alpha $$ α -particle optical model potential [Phys. Rev. C 90, 044612 (2014)] also for nucleon-induced $$\alpha $$ α -emission within the $$A \sim 60$$ A ∼ 60 mass-number range. The advantage of recent data for low-lying states feeding is taken as well. Consideration of additional reaction channels leading to increase of the $$\alpha $$ α -emission beyond the statistical predictions has concerned the pickup direct interaction and Giant Quadrupole Resonance similar features.

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“…As a matter of fact, since the beginning of the modern nuclear data evaluation (e.g., [13]) the mass region A∼90 was considered to provide unusual conditions under which nuclear models and parameters can be tested. This could explain the presence of the above-mentioned problems somehow at variance with the usual lack of critical deficiencies in statistical-model (SM) calculations [14].…”

Section: Introductionmentioning

confidence: 99%

Consistent optical potential for incident and emitted low-energy α particles. II. α emission in fast-neutron-induced reactions on Zr isotopes

Avrigeanu

2017

Phys. Rev. C

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Background: Challenging questions of the α-particle optical-model potential (OMP) are still pointed out by recent high-precision measurements of α-induced reaction data below the Coulomb barrier. Moreover, the reliability of a previous OMP for α-particles on nuclei within the mass number range 45≤A≤209 has been recently proved for emitted α particles as well, but only in the case of proton-induced reactions on Zn isotopes [Phys. Rev. C 91, 064611 (2015), Paper I].Purpose: Analysis of most recent (α, γ) reaction data for Ge and Zr isotopes, which provides an additional validation of the above-mentioned potential, is related to a further account of α-particle emission in neutron-induced reactions on Zr isotopes, at the same time with a suitable description of all competitive processes.Methods: A consistent parameter set, established or validated by independent analysis of recent various data, particularly γ-ray strength functions, have been involved within model calculation of the (α, γ) as well as (n, α) reaction cross sections. The latter are part of the whole analysis of the neutron activation of Zr isotopes, in order to avoid any error compensation or latent ambiguity. Results: The aforesaid potential provides a consistent description of recent α-induced reaction data with no empirical rescaling factors of the γ and/or nucleon widths. On the other hand, its use leads to underestimated predictions of the pre-equilibrium emission and statistical models for the (n, α) reaction cross sections.Conclusions: An optical potential with a volume imaginary component seems to be needed to describe the low-energy α-particle evaporation, while only surface absorption occurs in α-induced reactions at similar energies.

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Parameter Determination and Application to Nuclear Model Calculations of Neutron-Induced Reactions on Yttrium and Zirconium Isotopes

Cited by 16 publications

References 0 publications

Neutron total, scattering and inelastic Gamma-ray cross sections of yttrium at few MeV energies

Neutron total, scattering and inelastic Gamma-ray cross sections of yttrium at few MeV energies

Validation of an optical potential for incident and emitted low-energy $$\alpha $$-particles in the $$A\sim 60$$ mass range

Consistent optical potential for incident and emitted low-energy α particles. II. α emission in fast-neutron-induced reactions on Zr isotopes

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