Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Nukleare Astrophysik I
HK 18.7: Vortrag
Dienstag, 22. März 2011, 15:45–16:00, HS3
Coulomb dissociation reactions on proton-rich Argon isotopes — •Christoph Langer1,2 and Olga Lepyoshkina3 — 1IKP Institut für Kernphysik, Universität Frankfurt am Main, Germany — 2GSI Darmstadt, Germany — 3Physik Department TU-Muenchen, Garching, Germany
The rapid proton capture (rp-)process is an important part of explosive hydrogen burning scenarios. Far from stability proton capture rates are dominantly governed by only a few resonances and as a consequence statistical models are not applicable any more. The rp-process reaction flow in X-ray bursts has an important bottleneck in the 30S-34Ar region. The exotic nuclei of this region are of interest with respect to nuclear structure phenomena. Recent RQRPA calculations show a low-lying dipole mode for proton-rich argon isotopes. We performed a radioactive beam experiment in inverse and complete kinematics at GSI, applying the coulomb dissociation method on proton-rich Argon isotopes. The isotopes 32,34Ar and other isotopes with similar A/Z ratio, like 31,32Cl, were produced via fragmentation of a primary 36Ar beam at 825 AMeV and subsequently directed onto a 208Pb target, situated at the LAND/R3B setup. Because of the exclusive measurement of all particles it is possible to derive inclusive reaction cross sections and to study in detail the momentum distributions and energy-differential cross sections.
Basic analysis concepts and first inclusive (γ,p) cross sections will be presented.
Project is supported by HGF Young Investigators Project VH-NG-327.