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Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Nukleare Astrophysik

HK 9.8: Talk

Monday, March 19, 2012, 18:30–18:45, RW 2

Neutron-Capture Reactions with the R3B-CaveC Setup — •Marcel Heine — IKP, TU Darmstadt, Germany

Recent research has shown that the (n,γ) transition-rates on light nuclei can have an influence on the neutron-balance during the r-process. Especially neutron rich carbon isotopes play an important role in r-process nucleosynthesis network calculations which included light nuclei since these nuclei are aligned along major flow-paths. In particular 18C is of interest, because it can be interpreted as a waiting point. The 17C(n,γ)18C rate could so far only be estimated theoretically and has an uncertainty of a factor of ten [1]. At the R3B-CaveC setup at GSI we have measured the (n,γ) time reversed reaction, i.e. 18C(γ,n)17C for the above mentioned nucleus, via the Coulomb-breakup of 18C beam. The kinematically complete measurement allows extracting the differential cross section with respect to the excitation energy by using the invariant-mass method. First results and the strategy for further analysis will be presented.

This work is supported by the HIC for FAIR project.
[1] T. Sasaqui et al., APJ 634 (2005) 1173

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