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A series of photon scattering experiments has been performed on the double-beta decay partners 76Ge and 76Se, in order to investigate their dipole response up to the neutron separation threshold. Gamma-ray beams from bremsstrahlung at the S-DALINAC and from Compton-backscattering at HIGS have been used to measure absolute cross sections and parities of dipole excited states, respectively. The HIGS data allows for indirect measurement of averaged branching ratios, which leads to significant corrections in the observed excitation cross sections. Results are compared to statistical calculations, to test photon strength functions and the Axel-Brink hypothesis.
Heute sterben zehn- bis hundertmal mehr Arten aus, als dies ohne die massiven Einflüsse des Menschen auf das System »Erde«der Fall wäre. Der Artenforscher Matthias Schleuning untersucht, wie Pflanzen und Tiere in komplexen Ökosystemen voneinander abhängen. Damit kann er voraussagen, wer zu den Gewinnern und den Verlierern von Klimawandel und stärkerer Landnutzung werden wird.
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(2020)