Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Nukleare Astrophysik

HK 31.5: Vortrag

Mittwoch, 21. März 2012, 18:00–18:15, RW 2

^13,14B(n,γ) via Coulomb dissociation in inverse kinematics for the r-process nucleosynthesis — •Sebastian Altstadt — Goethe Universität, Frankfurt

Model calculations of r-process nucleosynthesis in a neutrino-driven wind scenario with a short dynamical timescale indicate, that light, neutron-rich nuclei may have a crucial influence on final r-process abundances [M. Terasawa et al., ApJ, 2001]. However, nuclear reaction rates of unstable nuclei far from stability are rarely known and extremely difficult to determine. Therefore, a kinematically complete measurement was performed with the R³B/LAND setup at GSI. To obtain the neutron capture cross sections of ¹³B and ¹⁴B, which are thought to be on the main flow path among the light elements with Z<10 [T. Sasaqui et. al, ApJ, 2005], the time-reversed reactions ¹⁴B(γ,n) and ¹⁵B(γ,n) were measured via Coulomb dissociation. The presentation focuses on the current status of the analysis and will discuss first results.
This project was supported by the Helmholtz International Center for FAIR and the Helmholtz Young Investigator Group VH-NG-327.