(α, xn) reactions on natural samarium

Archenti, A.; Ozafrán, M. J.; Nassiff, S. J.

doi:10.1007/bf02060986

Cited by 15 publications

(7 citation statements)

References 16 publications

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“…At energies above 25 MeV the cross section is about 350 mb. The results for this reaction could be compared with the values reported by Archenti et al [4]. The group used natural samarium foil as target material, therefore we normalized the values given by them to the values for an enriched target.…”

Section: Resultsmentioning

confidence: 94%

See 1 more Smart Citation

Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd

1995

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Excitation functions were measured by the stacked-foil technique for the ,47 Sm( 3 He,xn)-processes over the energy range of 12 to 37 MeV, and the 144 Sm(a,xn)-reactions over the energy range of 12 to 27 MeV. Thin samples of 96.5% enriched ,47 Sm 2 0 3 or 86.6% enriched ,44 Sm 2 0, of 10 mm diameter and 2-5 mg/cm 2 thickness were prepared via a sedimentation method. Thick target yields of l47 Gd were calculated from the measured excitation functions and the levels of radiogadolinium impurities were determined experimentally. The optimum energy range for the production of ,47 Gd via the 144 Sm( 3 He,3n)-process was found to be E 3a¡ = 36->13 MeV and via the 14? Sm(«,n)reaction as E a = 27->13 MeV. The expected thick target yield of ,47 Gd over the optimum energy range is 9.5 MBq/μΑΙι for the 'He-induced reaction and 4.6 MBq/μΑΙι for the α-induced reaction.

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Section: Resultsmentioning

confidence: 94%

“…Recently a few measurements were done on natural gadolinium [4], The aim of this work was to measure the exci-tation functions of the two potentially useful reactions, and therefrom to determine the yield of ,47 Gd as well as the levels of isotopie impurities.…”

Section: Introductionmentioning

confidence: 99%

Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd

1995

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“…The experimental technique has been previously described [1,2], Main features and details are further described in this paper.…”

Section: Methodsmentioning

confidence: 99%

Nuclear Reactions Induced by Alpha Particles on Natural Ytterbium

et al. 1992

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Ytterbium / Alpha particles induced reactions / Gamma spectroscopy / Stacked-foil technique / Cumulative cross sections / Preequilibrium effects AbstractThe Cumulative Cross Sections for the production of different nuclei using natural ytterbium as target and 84.32 MeV alpha particles as projectiles, were determined using the stacked foil technique in combination with gamma ray spectroscopy. The data are compared with theoretical predictions provided by an equilibrium and pre-equilibrium reaction model.

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“…It is obvious from Fig. 4 that the earlier data by Denzler et al [11] and Archenti et al [12] are not suitable to constrain the AOMP. In both experiments, the stacked-foil technique was used which leads to considerable uncertainties in the energy.…”

Section: Comparison Of Experimental and Theoretical (αN) Cross Sectionsmentioning

confidence: 86%

“…Denzler et al [11] but at the lowest energies -near the threshold -there are only few data points which bear high uncertainties both on the cross section value and on the energy scale. Cumulative activation yields from another experiment by Archenti et al [12] can be used to extract two further data points for the 144 Sm(α,n) 147 Gd reaction. But these data also have significant energy uncertainties of 1.5 MeV.…”

Section: Introductionmentioning

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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(α, xn) reactions on natural samarium

Cited by 15 publications

References 16 publications

Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd

Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd

Nuclear Reactions Induced by Alpha Particles on Natural Ytterbium

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

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(α, xn) reactions on natural samarium

Cited by 15 publications

References 16 publications

Excitation Functions of α- and 3He-Particle Induced Nuclear Reactions on Highly Enriched 144Sm and 147Sm: Comparative Evaluation of Production Routes for 147Gd

Excitation Functions of α- and 3He-Particle Induced Nuclear Reactions on Highly Enriched 144Sm and 147Sm: Comparative Evaluation of Production Routes for 147Gd

Nuclear Reactions Induced by Alpha Particles on Natural Ytterbium

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

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Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd

Excitation Functions of α- and ³He-Particle Induced Nuclear Reactions on Highly Enriched ¹⁴⁴Sm and ¹⁴⁷Sm: Comparative Evaluation of Production Routes for ¹⁴⁷Gd