Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.94: Poster
Montag, 7. März 2005, 16:30–18:00, TU MA141
Method for (n,γ)-cross section measurements of unstable isotopes — •Stephan Walter1, Michael Heil1, Franz Käppeler1, Ralf Plag1, and René Reifarth2 — 1Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe — 2LANL, Los Alamos, New Mexiko, 87545, USA
Quantitative studies of s-process nucleosynthesis in Red Giant stars require reliable cross sections for the unstable branching point isotopes. Such data are important with respect to explosive nucleosynthesis in the r- as well as in the p-process. Currently, time of flight (TOF) measurements are limited by the available neutron fluxes, which require target masses in the milligram region, implying severe backgrounds caused by the self activity of the target. We propose to increase the sensitivity of the TOF technique such that target masses of a few micrograms can be used. This is achieved by shortening the flight path to a few centimetres, along with the use of a 4π calorimeter for the detection of neutron capture events.