Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Heine, M.; Typel, S.; Wu, M.-R.; Adachi, T.; Aksyutina, Y.; Alcantara, J.; Altstadt, S.; Alvarez-Pol, H.; Ashwood, N.; Atar, L.; Aumann, T.; Avdeichikov, V.; Barr, M.; Beceiro-Novo, S.; Bemmerer, D.; Benlliure, J.; Bertulani, C. A.; Boretzky, K.; Borge, M. J. G.; Burgunder, G.; Caamano, M.; Caesar, C.; Casarejos, E.; Catford, W.; Cederkall, J.; Chakraborty, S.; Chartier, M.; Chulkov, L. V.; Cortina-Gil, D.; Crespo, R.; Datta Pramanik, U.; Dıaz Fernandez, P.; Dillmann, I.; Elekes, Z.; Enders, J.; Ershova, O.; Estrade, A.; Kanungo, R.

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Determination of the Neutron-Capture Rate of 17C for the R-process Nucleosynthesis

Heine, M.; Typel, S.; Wu, M.-R.; Adachi, T.; Aksyutina, Y.; Alcantara, J.; Altstadt, S.; Alvarez-Pol, H.; Ashwood, N.; Atar, L.; Aumann, T.; Avdeichikov, V.; Barr, M.; Beceiro-Novo, S.; Bemmerer, D.; Benlliure, J.; Bertulani, C. A.; Boretzky, K.; Borge, M. J. G.; Burgunder, G.; Caamano, M.; Caesar, C.; Casarejos, E.; Catford, W.; Cederkall, J.; Chakraborty, S.; Chartier, M.; Chulkov, L. V.; Cortina-Gil, D.; Crespo, R.; Datta Pramanik, U.; Dıaz Fernandez, P.; Dillmann, I.; Elekes, Z.; Enders, J.; Ershova, O.; Estrade, A.; Kanungo, R.

Date: 2017-01-30

Type: Text

ISSN: 2469-9985

Source:

Physical Review C 95(1), 014613. (2017)

Abstract:

With the R³B-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of ¹⁸C at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of ¹⁷C into the ground state of ¹⁸C. Those data have been used to constrain theoretical calculations for transitions populating excited states in ¹⁸C. This allowed to derive the astrophysical cross section σ^∗_nγ accounting for the thermal population of ¹⁷C target states in astrophysical scenarios. The experimentally verified capture rate is significantly lower than those of previously obtained Hauser-Feshbach estimations at temperatures T₉≤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 ¹⁷C on the production of second- and third-peak elements in contrast to earlier sensitivity studies.