Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process

Szücs, T.; Kiss, G. G.; Gyürky, Gy.; Halász, Z.; Fülöp, Zs.; Rauscher, T.

doi:10.1016/j.physletb.2017.11.072

Cited by 18 publications

(30 citation statements)

References 34 publications

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“…Fig. 2 shows that the predictions from the pBTM are in excellent agreement with recent experimental data [35][36][37][38][39][40][41][42]. Typical deviations are less than a factor of two which is marked as grey-shaded uncertainty band in Fig.…”

supporting

confidence: 76%

“…As an alternative to the statistical model, a simple barrier transmission model is suggested where the total reaction cross section is calculated from the transmission through the Coulomb barrier in a real (Color online) Total reaction cross section σreac (given as astrophysical S-factor) for α-induced reactions above A = 150. The pBTM predicts practically all experimental data [35][36][37][38][39][40][41][42] within a factor of two (grey shaded). The dotted lines show the results from the many-parameter AOMP of [20].…”

mentioning

confidence: 82%

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Successful prediction of total $α$-induced reaction cross sections at astrophysically relevant sub-Coulomb energies using a novel approach

Mohr,

Fülöp,

Gyürky

et al. 2020

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supporting

confidence: 76%

mentioning

confidence: 82%

Successful prediction of total $α$-induced reaction cross sections at astrophysically relevant sub-Coulomb energies using a novel approach

Mohr,

Fülöp,

Gyürky

et al. 2020

Preprint

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“…Encouraged by this successful application of the PBTM for 197 Au þ α, we have calculated σ reac for a series of αinduced reactions of heavy target nuclei above A ¼ 150. Figure 2 shows that the predictions from the PBTM are in excellent agreement with recent experimental data [53][54][55][56][57][58][59][60]. Typical deviations are less than a factor of 2 which is marked as a gray-shaded uncertainty band in Fig.…”

supporting

confidence: 72%

“…For lighter targets, the predictions of α-induced cross sections from different potentials do not vary as dramatically, and it was found that also the simple barrier transmission model reproduces experimental data very well. The recently measured 100 Moðα; nÞ 103 Ru data were predicted with similar uncertainties as in the A ≳ 150 mass range [64], and data for [53][54][55][56][57][58][59][60] within a factor of 2 (gray shaded). The dotted lines show the results from the many-parameter AOMP of [38].…”

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confidence: 59%

Successful Prediction of Total α -Induced Reaction Cross Sections at Astrophysically Relevant Sub-Coulomb Energies Using a Novel Approach

et al. 2020

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The prediction of stellar ðγ; αÞ reaction rates for heavy nuclei is based on the calculation of ðα; γÞ cross sections at sub-Coulomb energies. These rates are essential for modeling the nucleosynthesis of so-called p nuclei. The standard calculations in the statistical model show a dramatic sensitivity to the chosen α-nucleus potential. The present study explains the reason for this dramatic sensitivity which results from the tail of the imaginary α-nucleus potential in the underlying optical model calculation of the total reaction cross section. As an alternative to the optical model, a simple barrier transmission model is suggested. It is shown that this simple model in combination with a well-chosen α-nucleus potential is able to predict total α-induced reaction cross sections for a wide range of heavy target nuclei above A ≳ 150 with uncertainties below a factor of 2. The new predictions from the simple model do not require any adjustment of parameters to experimental reaction cross sections whereas in previous statistical model calculations all predictions remained very uncertain because the parameters of the α-nucleus potential had to be adjusted to experimental data. The new model allows us to predict the reaction rate of the astrophysically important 176 Wðα; γÞ 180 Os reaction with reduced uncertainties, leading to a significantly lower reaction rate at low temperatures. The new approach could also be validated for a broad range of target nuclei from A ≈ 60 up to A ≳ 200.

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“…Alpha-induced cross section data on 191,193 Ir and 197 Au are now available. For details see the original publications: [14,15]. The results indicate the need for developing new or modified optical potentials for low energy problems [16] and based on the observations a new treatment of the alpha-induced reactions has also been suggested [17].…”

Section: Experiments Related To the Astrophysical P-processmentioning

confidence: 99%

Stable beam experiments in wide energy ranges serving low energy nuclear astrophysics

Gyürky

2019

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In experimental nuclear astrophysics it is common knowledge that reaction cross sections must be measured in the astrophysically relevant, low energy ranges or at least as close to them as possible. In most of the cases, however, it is impossible to reach such low energies. The reactions must therefore be studied at higher energies and the cross sections must be extrapolated to lower ones. In this paper the importance of cross section measurements in wide energy ranges are emphasized and a few examples are shown from the areas of hydrogen burning processes and heavy element nucleosynthesis.

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Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process

Cited by 18 publications

References 34 publications

Successful prediction of total $α$-induced reaction cross sections at astrophysically relevant sub-Coulomb energies using a novel approach

Successful prediction of total $α$-induced reaction cross sections at astrophysically relevant sub-Coulomb energies using a novel approach

Successful Prediction of Total α -Induced Reaction Cross Sections at Astrophysically Relevant Sub-Coulomb Energies Using a Novel Approach

Stable beam experiments in wide energy ranges serving low energy nuclear astrophysics

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