München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 60: Nuclear Astrophysics V
HK 60.5: Vortrag
Freitag, 22. März 2019, 15:15–15:30, HS 16
The Measurement of Long Lived Alpha Decay for Cosmochronometry — •Heinrich Wilsenach1, Kai Zuber1, Ulli Köster2, and Mihály Braun3 — 1Institut für Kern- und Teilchenphysik TU-Dresden, Dresden, Germany — 2Institut Laue Langevin, Grenoble, France — 3Institute for Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary
Due to the mechanism of alpha decay, it has the largest span of half-lives of any decay. The large range of half-lives allows alpha decay to be used as a tool to probe many different fields of physics. A field of recent interest is dating the formation of the Solar System using isotopic ratios. This dating technique relies on isotopes with half-lives in the range of megayears. One of the weaknesses of this technique is the reliability of the half-lives. Measuring this quantity is challenging as the material does not usually exist in nature. This means that the isotopes of interest will have to be made accurately in quantities that give a sufficiently detectable signal. To produce these rare materials the ISOLDE facility at CERN was used. A ultrapure beam of the isotope of interest was implanted into aluminium foil. The foils were then measured with an ultra-low background ionisation chamber. The chamber was specially designed and built to measure low signal rates and has a background in the region of interest of around 0.27 counts per day per MeV. The design and operation of this alpha detector will be discussed, as well as some preliminary results of the new implantation technique.