Astrophysical Models of r-Process Nucleosynthesis: An Update
  An update on astrophysical models for nucleosynthesis via rapid neutron capture, the r process, is given. A neutrino-induced r process in supernova helium shells may have operated up to metallicities of ~10^-3 times the solar value. Another r-process source, possibly neutron star mergers, is required for higher metallicities. 
Yong-Zhong Qian (UMN)
astro-ph.SR nucl-th