[Zurück]

C. Lederer, C. Massimi, E. Griesmayer, E. Jericha, H. Leeb, C. Weiß, -. nTOF Collaboration et al.:
"Neutron Capture Cross Section of Unstable ⁶³Ni: Implications for Stellar Nucleosynthesis";
Physical Review Letters, 110 (2013), 022501; S. 1 - 5.

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.

Radiative capture; Resonance reactions, nucleon-induced; s-process (nuclear astrophysics); 59 <= A <= 89

http://dx.doi.org/10.1103/PhysRevLett.110.022501