Deducing primary 
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-ray intensities and the dipole strength function in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Mo</mml:mi><mml:mprescripts /><mml:none /><mml:mn>94</mml:mn></mml:mmultiscripts></mml:math>
 via radiative proton capture

Heim, F.; Mayer, J.; Müller, M.; Scholz, Philipp; Zilges, A.

doi:10.1103/physrevc.103.025805

Cited by 5 publications

(1 citation statement)

References 56 publications

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“…The radiative strength functions (RSF) for Nb and especially Mo isotopes do not yet have a confident parametrization despite the widespread systematics [44,45] and extensive studies ( [46] and Refs. therein) performed since our former analysis for Zr stable isotopes FIG.…”

Section: A Compound and Pre-equilibrium Emissionmentioning

confidence: 99%

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Avrigeanu¹,

Avrigeanu²

2023

Preprint

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Background: The reliability of a previous α-particle optical-model potential (OMP) on nuclei with mass number 45≤A≤209 was proved for emitted α particles as well, for proton-induced reactions on Zn isotopes [Phys. Rev. C 91, 064611 (2015), Paper I]. However, the same was not the case of neutrons on Zr stable isotopes [Phys. Rev. C 96, 044610 (2017), Paper II].Purpose: A recent assessment of this potential also for nucleon-induced α-emission on A∼60 nuclei, including pickup direct reaction and eventual Giant Quadrupole Resonance (GQR) α-emission, is completed for neutrons incident on Zr, Nb, and Mo stable isotopes. Methods: Consistent sets of input parameters, determined through analysis of independent data, is involved while no further empirical rescaling factors of the γ and nucleon widths have been involved.Results: A suitable account of all competitive reaction channels is confirmed by careful uncertainty analysis, to avoid parameter ambiguities and/or error compensation. Additional validation of this potential is also supported by recently measured (α, γ) and (α, n) cross-sections of Zr and Mo nuclei.Conclusions: An increase of the α-emission beyond the statistical predictions, through consideration of additional reaction channels of the pickup direct interaction and like-GQR decay, makes possible the description of both absorption and emission of α particles by the same optical potential.

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Section: A Compound and Pre-equilibrium Emissionmentioning

confidence: 99%

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Avrigeanu¹,

Avrigeanu²

2023

Preprint

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Cross-section measurements relevant for the astrophysical p process at the University of Cologne

et al. 2022

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The astrophysical p process unites all processes that have been introduced to explain the abundance of a group of 30 to 35 neutron-deﬁcient nuclei which are referred to as p nuclei. In general, these p processes include large networks of nuclear reactions and a complete understanding of the individual reaction rates is required to describe the abundance of the p nuclei qualitatively and quantitatively. In many cases the involved nuclear reactions are not accessible in the laboratory, either due to their low cross sections or because they involve unstable or exotic isotopes. For those purposes, the motivation of cross-section measurements performed at the University of Cologne is twofold: First, experimentally constrained reaction rates are of direct relevance for nucleosynthesis network calculations. And second, experimental cross-section values are required to test existing theoretical descriptions and to improve their predictive power. In this work, we present the experimental setups and methods that are used to measure nuclear cross-sections at very low sensitivities and we show a detailed overview of proton-and α-induced reactions that have been measured in Cologne in the last decade.

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Results of total cross-section measurements of the ⁸⁷Rb(p,γ)⁸⁸Sr reaction

et al. 2023

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The existence of a set of stable proton-rich nuclei - the p nuclei - cannot be explained via neutron-capture reactions. Therefore, another mechanism has to exist in order to explain their origin, the most probable, especially at high masses, being photodisintegration reactions. This gives rise to the γ process. Since most photodisintegration reactions involved in the process are not experimentally accessible, reliable statistical model calculations are needed to predict cross sections and reaction rates. To improve these calculations nuclear input parameters need to be constrained and a large experimental database is needed. Via comparison of experimental data to theoretical predictions different models can be tested and constrained. In order to study the 87Rb(p,γ)88Sr reaction, for which previously no experimental data have been available, an in-beam experiment at at the University of Cologne’s high-efficiency HPGe γ-ray spectrometer HORUS was performed. Proton beams with energies between Ep = 2000 to 5000 keV reaching deep into the Gamow window of the reaction were provided by the 10 MV FN Tandem accelerator. Cross-section values at six proton beam energies were determined. The experimental results are in good agreement with statistical model calculations. The obtained results are the first experimental cross-section values for the87Rb(p,γ)88Sr reaction and help to constrain the nuclear physics input for statistical model calculations.

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Deducing primary γ -ray intensities and the dipole strength function in Mo94 via radiative proton capture

Cited by 5 publications

References 56 publications

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Cross-section measurements relevant for the astrophysical p process at the University of Cologne

Results of total cross-section measurements of the ⁸⁷Rb(p,γ)⁸⁸Sr reaction

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Deducing primary γ -ray intensities and the dipole strength function in Mo94 via radiative proton capture

Cited by 5 publications

References 56 publications

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

Cross-section measurements relevant for the astrophysical p process at the University of Cologne

Results of total cross-section measurements of the 87Rb(p,γ)88Sr reaction

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Product

Resources

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Results of total cross-section measurements of the ⁸⁷Rb(p,γ)⁸⁸Sr reaction