Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis

Lederer, C. and Massimi, C. and Altstadt, S. and Andrzejewski, J. and Audouin, L. and Barbagallo, M. and Bécares, V. and Bečvář, F. and Belloni, F. and Berthoumieux, E. and Billowes, J. and Boccone, V. and Bosnar, D. and Brugger, M. and Calviani, M. and Calviño, F. and Cano-Ott, D. and Carrapiço, C. and Cerutti, F. and Chiaveri, E. and Chin, M. and Colonna, N. and Cortés, G. and Cortés-Giraldo, M. A. and Diakaki, M. and Domingo-Pardo, C. and Duran, I. and Dressler, R. and Dzysiuk, N. and Eleftheriadis, C. and Pignatari, Marco and Rauscher, Thomas (2013) Neutron capture cross section of unstable Ni63: Implications for stellar nucleosynthesis. PHYSICAL REVIEW LETTERS, 110 (2). ISSN 0031-9007

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Abstract

The Ni63(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. © 2013 American Physical Society.

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