Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Nukleare Astrophysik I

HK 18.6: Vortrag

Dienstag, 22. März 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