Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Nuclear Astrophysics VII

HK 53.2: Talk

Thursday, March 13, 2025, 16:15–16:30, SR 0.03 Erw. Physik

Measurement of ⁸⁷Rb(p, γ)⁸⁸Sr total reaction cross sections — •Svenja Wilden, Benedikt Machliner, Martin Müller, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

The origin of the p nuclei - a group of stable proton-rich nuclei - cannot be attributed to neutron - capture processes [1]. Instead, their synthesis involves a network of photodisintegration reactions, known as the γ process. Statistical model calculations are essential for predicting reaction rates and cross sections for reactions involved in this process.

An in-beam experiment was conducted to study the ⁸⁷Rb(p, γ)⁸⁸Sr reaction using the high-efficiency HPGe γ-ray spectrometer HORUS at the University of Cologne. Proton beams with energies between E_p = 2 and 5 MeV were supplied by a 10 MV FN Tandem accelerator. Cross-section values were determined for six proton-beam energies. These measurements provide the first experimental cross sections for the ⁸⁷Rb(p, γ)⁸⁸Sr reaction, offering constraints on nuclear physics inputs for statistical model calculations.

[1] M. Arnould and S. Gorieley, Prog. Part. Nucl. Phys. 112 (2020) 103766.

Supported by the DFG (ZI 510/8-2).

Keywords: gamma process; p process; in-beam method