# Determination of the Neutron-Capture Rate of $^{17}$C for the R-process Nucleosynthesis

Abstract : With the R$^{3}$B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of $^{18}$C at a projectile energy around 425~AMeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of $^{17}$C into the ground state of $^{18}$C. Those data have been used to constrain theoretical calculations for transitions populating excited states in $^{18}$C. This allowed to derive the astrophysical cross section $\sigma^{*}_{\mathrm{n}\gamma}$ accounting for the thermal population of $^{17}$C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures $T_{9}\leq{}1$~GK. Network simulations with updated neutron-capture rates and hydrodynamics according to the neutrino-driven wind model as well as the neutron-star merger scenario reveal no pronounced influence of neutron capture of $^{17}$C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01305378
Contributor : Michel Lion <>
Submitted on : Thursday, April 21, 2016 - 8:18:37 AM
Last modification on : Tuesday, December 1, 2020 - 4:10:04 PM

### Citation

M. Heine, S. Typel, M.-R. Wu, T. Adachi, Y. Aksyutina, et al.. Determination of the Neutron-Capture Rate of $^{17}$C for the R-process Nucleosynthesis. Physical Review C, American Physical Society, 2017, 95, pp.014613. ⟨10.1103/PhysRevC.95.014613⟩. ⟨in2p3-01305378⟩

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