München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Nuclear Astrophysics III
HK 38.3: Talk
Wednesday, March 20, 2019, 14:45–15:00, HS 18
Measurement of 69,71Ga(n,g) at astrophysical energies using time of flight — •D. Kurtulgil1, K. Göbel1, S. Fiebiger1, F. Käppeler2, C. Lederer-Woods3, S.-J. Lonsdale3, R. Reifarth1, M. Weigand1, and P. Woods3 for the nTOF collaboration — 1Goethe University Frankfurt, Germany — 2Karlsruhe Institute of Technology, Karlsruhe, Germany — 3University of Edinburgh, Edinburgh, United Kingdom
The origin of elements heavier than iron in stellar nucleosynthesis can in large parts be explained by neutron capture reactions, namely the r- and s-process. In order to reproduce the observed isotopic abundances in nucleosynthesis simulations, an exact knowledge of the involved reaction rates at astrophysical energies is necessary.
The stable isotopes 69Ga and 71Ga play an important role in the weak s-process, but experimental data for these reactions are scarce.
The cross-section of neutron capture onto isotopically enriched 69Ga and 71Ga samples was measured at the n_TOF experiment’s EAR1 beamline at CERN, Geneva, using the time of flight technique to cover a neutron energy range of eV to several hundred keV.
We will present the current status of the analysis.
This project is supported by DFG (RE 3461/4-1), HGS-HIRe and HIC for FAIR.