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Neutron Capture Cross Section of Unstable 63Ni: Implications for Stellar Nucleosynthesis

Abstract : The 63Ni(n,γ) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT=5-100 keV with uncertainties around 20%. Stellar model calculations for a 25M⊙ star show that the new data have a significant effect on the s-process production of 63Cu, 64Ni, and 64Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.
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http://hal.in2p3.fr/in2p3-00834095
Contributor : Sophie Heurteau <>
Submitted on : Friday, June 14, 2013 - 10:57:41 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:13 PM

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C. Lederer, L. Audouin, L. S. Leong, L. Tassan-Got, F. Belloni, et al.. Neutron Capture Cross Section of Unstable 63Ni: Implications for Stellar Nucleosynthesis. Physical Review Letters, American Physical Society, 2013, 110, pp.022501. ⟨10.1103/PhysRevLett.110.022501⟩. ⟨in2p3-00834095⟩

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