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Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Nuclear Astrophysics III

HK 42.7: Vortrag

Donnerstag, 30. März 2017, 15:45–16:00, F 33

The Measurement of Long Lived Alpha Decay for Cosmochronometry — •Heinrich Wilsenach1, Kai Zuber1, Réne Heller2, Volker Neu3, Yordan Georgiev4, and Tommy Schönherr41IKTP TU-Dresden, Dresden, Germany — 2Institute of Ion Beam Physics and Materials Research, Dresden-Rossendorf, Germany — 3Institute for Metallic Materials, Dresden, Germany — 4Transport Phenomena in Nanostructures, Dresden-Rossendorf, Germany

Long lived alpha decaying isotopes (about T1/2 = 108−10 a) can be used as a powerful tool to date the formation of astronomical objects in the Solar System. This is due to their extremely long half-lives. This technique is however very vulnerable to the accuracy of the half-life. This means that improved half-life measurements are important, though they pose a significant technical obstacle.

To measure the half-lives of this magnitude special care needs to be taken with background and signal efficiency. To overcome these obstacles the design of the twin Frisch-Grid ionisation chamber was chosen. This design combines excellent energy resolution with a high detector efficiency to measure decay rates in the region of a few counts per day. Pulse shape analysis was used to improved signal to background discrimination.

This presentation will give an overview of the detection aspects of the twin Frisch-Grid ionisation chamber, as well as new measurements of the half-lives of 147Sm and 190Pt.

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