Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Nukleare Astrophysik

HK 8.2: Vortrag

Montag, 4. März 2013, 11:30–11:45, HSZ-403

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

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 include 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 energy dependent neutron-capture cross section with respect to the excitation energy by using the invariant-mass method. 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