Total reaction cross sections from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>141</mml:mn></mml:msup></mml:math>Pr(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi><mml:mo>,</mml:mo><mml:mspace width="-0.16em" /><mml:mi>α</mml:mi></mml:mrow></mml:math>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>141</mml:mn></mml:msup></mml:math>Pr elas

Mohr, P.

doi:10.1103/physrevc.84.055803

Cited by 16 publications

(4 citation statements)

References 53 publications

(152 reference statements)

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“…The σ L are the contributions of the Lth partial wave to the total reaction cross section σ reac which show a characteristic behavior as discussed, e.g., in Refs. [21,41].…”

Section: Analysis Of Scattering Datamentioning

confidence: 99%

“…It has turned out over the years that standard α-nucleus potentials like the extremely simple McFadden-Satchler potential [11] are able to reproduce (α,n) and (α,γ ) cross sections around and above the Coulomb barrier, whereas at very low energies below the Coulomb barrier (i.e., in the astrophysically relevant energy range) an increasing overestimation of the experimental reaction cross sections has been found in many cases (e.g., [12][13][14][15][16][17][18][19][20][21][22][23][24][25]). Interestingly, in the A ≈ 20-50 mass range, experimental (α,p) and (α,n) data are well described using the McFadden-Satchler potential [26].…”

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confidence: 99%

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α scattering and α -induced reaction cross sections of Zn64 at low energies

Ornelas¹,

Mohr²,

Gyürky³

et al. 2016

Phys. Rev. C

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Background: α-nucleus potentials play an essential role for the calculation of α-induced reaction cross sections at low energies in the statistical model. Uncertainties of these calculations are related to ambiguities in the adjustment of the potential parameters to experimental elastic scattering angular distributions and to the energy dependence of the effective α-nucleus potentials. Purpose: The present work studies the total reaction cross section σ reac of α-induced reactions at low energies which can be determined from the elastic scattering angular distribution or from the sum over the cross sections of all open nonelastic channels. Method: Elastic and inelastic64 Zn(α,α) 64 Zn angular distributions were measured at two energies around the Coulomb barrier, at 12.1 and 16.1 MeV. Reaction cross sections of the (α,γ ), (α,n), and (α,p) reactions were measured at the same energies using the activation technique. The contributions of missing nonelastic channels were estimated from statistical model calculations. Results: The total reaction cross sections from elastic scattering and from the sum of the cross sections over all open nonelastic channels agree well within the uncertainties. This finding confirms the consistency of the experimental data. At the higher energy of 16.1 MeV, the predicted significant contribution of compound-inelastic scattering to the total reaction cross section is confirmed experimentally. As a by-product it is found that most recent global α-nucleus potentials are able to describe the reaction cross sections for 64 Zn around the Coulomb barrier. Conclusions: Total reaction cross sections of α-induced reactions can be well determined from elastic scattering angular distributions. The present study proves experimentally that the total cross section from elastic scattering is identical to the sum of nonelastic reaction cross sections. Thus, the statistical model can reliably be used to distribute the total reaction cross section among the different open channels.

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“…The σ L are the contributions of the Lth partial wave to the total reaction cross section σ reac which show a characteristic behavior as discussed, e.g., in Refs. [21,41].…”

Section: Analysis Of Scattering Datamentioning

confidence: 99%

mentioning

confidence: 99%

α scattering and α -induced reaction cross sections of Zn64 at low energies

Ornelas¹,

Mohr²,

Gyürky³

et al. 2016

Phys. Rev. C

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“…Because of its simplicity, the MCF AOMP is widely used; e.g., the NON-SMOKER calculations of reaction rates [36] utilize the MCF AOMP, and these rates are adopted in the REA-CLIB database used in many astrophysical models [37]. Whereas the MCF AOMP can be applied successfully to low-energy data in the A ≈ 20 − 50 mass range [38], the MCF AOMP fails at sub-Coulomb energies in the heavy mass range; see, e.g., [8,9] for the 144 Sm(α,γ) 148 Gd reaction and [30,39,40] for other target nuclei.…”

Section: Discussion Of the Various α-Nucleus Potentialsmentioning

confidence: 99%

Cross section measurement of the 144Sm(alpha,n)147Gd reaction for studying the alpha-nucleus optical potential at astrophysical energies

Gyürky¹,

Mohr²,

Angyal³

et al. 2023

Preprint

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Background: Nuclear reactions involving alpha particles play an important role in various astrophysical processes such as the γ-process of heavy element nucleosynthesis. The poorly known low-energy α-nucleus optical potential is a key parameter to estimate the rates of these reactions. Purpose:The α-nucleus optical potential can be tested by measuring the cross section of α-scattering as well as α-induced reactions. Low energy elastic α-scattering on 144 Sm has recently been measured with high precision. The aim of the present work was to complement that work by measuring the (α,n) cross sections on 144 Sm at low energies. The experimental data shall be used to constrain the α-nucleus optical model potential. From this potential the 144 Sm(α,γ) 148 Gd reaction rate can be derived with reduced uncertainties.Method: The 144 Sm(α,n) 147 Gd reaction was studied by bombarding Sm targets with α-beams provided by the cyclotron accelerator of Atomki. The cross section was determined using the activation method. The γ-radiation following the decay of the 147 Gd reaction product was measured with a HPGe detector. The experimental data are analyzed within the statistical model. Results:The cross section was measured in the α-energy range between 13 and 20 MeV in 1 MeV steps, i.e., from close above the (α,n) threshold. The results were compared with statistical model calculations using various approaches and parametrizations for the α-nucleus optical potential, and excellent agreement was obtained for two recent potentials. However, these potentials cannot reproduce literature data for the 144 Sm(α,γ) 148 Gd reaction with the same accuracy.Conclusions: Constraints for the α-nucleus potential were derived from an analysis of the new 144 Sm(α,n) 147 Gd data and literature data for 144 Sm(α,γ) 148 Gd. These constraints enable a determination of the reaction rate of the 144 Sm(α,γ) 148 Gd reaction with significantly reduced uncertainties of less than a factor of two.

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“…The obtained data from (,) reactions and the inverse (,) reactions are valuable for solving various unknowns in this field. Despite the lack of experimental data, especially on the (,) reaction,  induced reaction cross-section measurements have been made for many target nuclei by ATOMKI team in recent years (Gyürky et al, 2012;Mohr, 2011Mohr, , 2013Mohr et al, 2010Mohr et al, , 2020Szücs et al, 2018;Wilmes et al, 2002). In the mentioned studies, theoretical analyzes of the reactions were also carried out in great detail.…”

Section: Introductionmentioning

confidence: 99%

Studying optimum values of statistical model ingredients for (,) and (,) reactions

BÜYÜKUSLU

2024

Karadeniz Fen Bilimleri Dergisi

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In order to further develop nuclear models/functions, it is important to test various models and functions included in cross-section calculations based on different reaction types, energy ranges, and masses. In this study, the dependence of nuclear ingredients such as level density, -nucleus optical model and γ-ray strength function on the cross-section were illustrated by making systematic calculations in the statistical model window. Reaction cross-section calculations were systematically performed for (α,γ) and (γ,α) reactions, which hold significant importance in astrophysics, on various target nuclei. Theoretical model calculations were compared with experimental data. For each set of experimental and calculated cross sections, the average deviation factor values were determined. The best-fit models and functions for all incoming alpha and gamma energies and for all target nuclei were identified.

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Total reaction cross sections from141Pr(α,α)141Pr elas

Cited by 16 publications

References 53 publications

α scattering and α -induced reaction cross sections of Zn64 at low energies

α scattering and α -induced reaction cross sections of Zn64 at low energies

Cross section measurement of the 144Sm(alpha,n)147Gd reaction for studying the alpha-nucleus optical potential at astrophysical energies

Studying optimum values of statistical model ingredients for (,) and (,) reactions

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