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Determination of the neutron-capture rate of C 17 for r -process nucleosynthesis

Heine, M.; Typel, S.; Wu, M. R.; Adachi, T; Aksyutina, Y.; Alcantara, J.; Altstadt, S.; Alvarez-Pol, H; Ashwood, N. and Atar, L., et al. (2017) In Physical Review C: covering nuclear physics 95(1).
Abstract

With the RB3-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C18 at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of C17 into the ground state of C18. Those data have been used to constrain theoretical calculations for transitions populating excited states in C18. This allowed to derive the astrophysical cross section σnγ∗ accounting for the thermal population of C17 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... (More)

With the RB3-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C18 at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of C17 into the ground state of C18. Those data have been used to constrain theoretical calculations for transitions populating excited states in C18. This allowed to derive the astrophysical cross section σnγ∗ accounting for the thermal population of C17 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 C17 on the production of second- and third-peak elements in contrast to earlier sensitivity studies.

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Physical Review C: covering nuclear physics
volume
95
issue
1
publisher
American Physical Society
external identifiers
  • scopus:85015197719
  • wos:000399784100005
ISSN
2469-9985
DOI
10.1103/PhysRevC.95.014613
language
English
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yes
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a7e49693-f469-4f99-80d1-9756f955a9d3
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2017-03-30 08:35:47
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2019-01-06 13:04:30
@article{a7e49693-f469-4f99-80d1-9756f955a9d3,
  abstract     = {<p>With the RB3-LAND setup at GSI we have measured exclusive relative-energy spectra of the Coulomb dissociation of C18 at a projectile energy around 425A MeV on a lead target, which are needed to determine the radiative neutron-capture cross sections of C17 into the ground state of C18. Those data have been used to constrain theoretical calculations for transitions populating excited states in C18. This allowed to derive the astrophysical cross section σnγ∗ accounting for the thermal population of C17 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 C17 on the production of second- and third-peak elements in contrast to earlier sensitivity studies.</p>},
  articleno    = {014613},
  author       = {Heine, M. and Typel, S. and Wu, M. R. and Adachi, T and Aksyutina, Y. and Alcantara, J. and Altstadt, S. and Alvarez-Pol, H and Ashwood, N. and Atar, L. and Aumann, T. and Avdeichikov, V. and Barr, M. and Beceiro-Novo, S. and Bemmerer, D. and Benlliure, J. and Bertulani, C. A. and Boretzky, K. and Borge, M. J. G. and Burgunder, G. and Caamano, M and Caesar, C. and Casarejos, E. and Catford, W. and Cederkäll, J. and Chakraborty, S. and Chartier, M. and Chulkov, L. V. and Cortina-Gil, D and Crespo, R. and Datta Pramanik, U and Diaz Fernandez, P. and Dillmann, I. and Elekes, Z. and Enders, J and Ershova, O. and Estrade, A. and Farinon, F. and Fraile, L. M. and Freer, M. and Freudenberger, M. and Fynbo, H O U and Galaviz, D. and Geissel, H. and Gernhäuser, R and Göbel, Kathrin and Golubev, P. and Diaz-Gonzalez, Federico and Hagdahl, J. and Jakobsson, B. and , },
  issn         = {2469-9985},
  language     = {eng},
  month        = {01},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {	Physical Review C: covering nuclear physics},
  title        = {Determination of the neutron-capture rate of C 17 for r -process nucleosynthesis},
  url          = {http://dx.doi.org/10.1103/PhysRevC.95.014613},
  volume       = {95},
  year         = {2017},
}