Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Nuclear Astrophysics 1

HK 11.3: Talk

Monday, March 23, 2015, 17:45–18:00, K/HS2

Neutron-Capture Rates with the R³B-CaveC Setup — •Marcel Heine for the R3B collaboration — 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 time reversed reaction, i.e. ¹⁸C(γ,n)¹⁷C via the Coulomb dissociation of ¹⁸C beam. The kinematically complete measurement allows extracting exclusive energy dependent neutron-capture cross section with respect to the excitation energy by using the invariant-mass method. Experimental results will be presented in comparison to theoretical calculations and the influence on r-process nucleosynthesis products will be discussed. This work is supported by HIC for FAIR, GSI-TU Darmstadt cooperation, and the BMBF project 05P12RDFN8

[1] T. Sasaqui et al., APJ 634 (2005) 1173