A large uncertainty for the slow neutron capture nucleosynthesis (s-process) models is caused by the amount of neutrons available to the process itself. This quantity is strongly affected by the C-13(alpha,n)O-16, and Ne-22(alpha,n)Mg-25 reaction cross sections, whose measurements at energies corresponding to the s-process thermal conditions ( -10(2) keV) are mainly hampered by the Coulomb barrier. For this reason, indirect approaches could offer a complementary way of investigation and, among these, the Trojan Horse Method (THM) has been applied to determine these cross sections overcoming the Coulomb barrier. With this approach, a low-energy binary reaction cross section can be obtained selecting the quasi-free contribution from a suitable three-body reaction cross section, taking advantage of the cluster structure of proper nuclei.

Neutron-Driven Nucleosynthesis in Stellar Plasma

La Cognata, M;Guardo, GL;Palmerini, S;Sergi, ML;Lamia, L;Lattuada, D;Rapisarda, GG;Romano, S;
2022

Abstract

A large uncertainty for the slow neutron capture nucleosynthesis (s-process) models is caused by the amount of neutrons available to the process itself. This quantity is strongly affected by the C-13(alpha,n)O-16, and Ne-22(alpha,n)Mg-25 reaction cross sections, whose measurements at energies corresponding to the s-process thermal conditions ( -10(2) keV) are mainly hampered by the Coulomb barrier. For this reason, indirect approaches could offer a complementary way of investigation and, among these, the Trojan Horse Method (THM) has been applied to determine these cross sections overcoming the Coulomb barrier. With this approach, a low-energy binary reaction cross section can be obtained selecting the quasi-free contribution from a suitable three-body reaction cross section, taking advantage of the cluster structure of proper nuclei.
neutron induced reactions
stellar evolution
nucleosynthesis
indirect process
s-process
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/542020
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