Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Nuclear Astrophysics I
HK 11.5: Vortrag
Montag, 28. März 2022, 15:15–15:30, HK-H10
Energy calibration of the 5MV accelerator at the Felsenkeller shallow-underground laboratory — •Simon Rümmler1, Daniel Bemmerer1, Axel Boeltzig1, Fabia Dietrich1, Armin Freimann1, Jonas Koch1, Till Lossin1, Felix Ludwig1, Max Osswald1, Konrad Schmidt1, Julian Schwengfelder1, Steffen Turkat2, and Kai Zuber2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics — 2TU Dresden, Institute of Nuclear and Particle Physics
Astrophysical radiative capture reactions occur at low energies, resulting in low cross sections and hence low counting rates in the γ-detectors. This calls for accelerator facilities that are located underground, shielded from cosmic rays. The shallow-underground laboratory at Felsenkeller in Dresden provides 45 meters of rock overburden for the installed 5MV Pelletron accelerator. In addition to a low-background setting, an energy calibration of the accelerator is needed to perform precise measurements.
During the commisioning of the accelerator and its two ion sources, as well as during first astrophysically relevant experiments, measurements for different methods of an energy calibration were recorded. The results of the individual methods were obtained independently and provide consistent results, even at different accelerator voltages. The overall result of the completed energy calibration and a comparison of the methods will be presented.