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Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Nukleare Astrophysik I

HK 18.6: Talk

Tuesday, March 22, 2011, 15:30–15:45, HS3

Coulomb breakup of the r-pocess waiting point nucleus 18C — •Marcel Heine — 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 included light nuclei. In particular 18C is of interest, since it can be interpreted as a waiting point. The rate of the production reaction 17C(n,γ)18C could so far only be estimated theoretically and has an uncertainty of a factor of 10 [1]. At the R3B/LAND setup at GSI we have studied the (n,γ) time reversed reaction, i.e. 18C(γ,n)17C 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.

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

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