Frankfurt 2014 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Nukleare Astrophysik

HK 62.3: Vortrag

Freitag, 21. März 2014, 14:45–15:00, HZ 5

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 nucleo synthesis 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 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. This work is supported by BMBF, HIC for FAIR and NAVI

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