R-Process Alliance
The R-Process Alliance (RPA) is a collaboration started in 2017, including astronomers, modelers, nuclear theorists, and experimentalists. The RPA aims to address the numerous questions surrounding the rapid neutron-capture process, which is responsible for producing approximately half of the heavy elements beyond iron in the Solar System. You can find out more about the RPA here and find our complete list of publications here.
Snapshot Survey
The first phase of the RPA has been focused on searching for r-process enhanced stars among bright metal-poor stars in the Milky Way halo. We have, to date, observed more than 2,000 stars and published abundances for ~650 of these in our five data release papers (DR1, DR2, DR3, DR4, DR5).
Summary plot from DR4 showing the distribution of Eu abundances in the sample stars. (Holmbeck et al., 2020)