Münster 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HK: Fachverband Physik der Hadronen und Kerne

HK 52: Nukleare Astrophysik III

HK 52.4: Vortrag

Donnerstag, 24. März 2011, 15:00–15:15, C-2

Lifetime measurements of astrophysical interest via the Doppler Shift Attenuation Method — •Clemens Herlitzius and Shawn Bishop — TU München, Garching, Deutschland

Resonant (p,γ) capture reactions on seed nuclei play a key role in the production of intermediate mass elements in classical nova events. The rates of these reactions are often very uncertain. Network calculations use those rates to model the abundance of synthesized nuclei in the ejecta. Since direct rate measurements are not always possible because of small cross sections, indirect methods can be used to determine the reaction rates. The spins of the involved particles, as well as the energies and lifetimes of the excited states of the compound nucleus must be known. Lifetimes in a range of fs up to ps can be measured with the Doppler Shift Attenuation Method (DSAM). A DSAM facility has been designed and installed in 2010 at the tandem accellerator in the Maier-Leibnitz-Laboratorium of LMU and TU Muenchen. This talk will highlight the experimental technique and show data of the commissioning beam time in August 2010 and February 2011.