3:30 pm MCP 201
NRLEEs (Neutron-Rich, Low-Entropy matter Ejectors) is a generic term for the dominant astrophysical site for the production of calcium-48 and other neutron-rich iron-group nuclides. Though NRLEEs have not been unambiguously identified, they are most likely thermonuclear electron-capture supernovae. Dust from NRLEEs was probably present in the early Solar System and was responsible for isotopic anomalies in neutron-rich iron-group isotopes found in planetary materials. NRLEE dust, though a minor component of the initial building blocks in the Solar System, was thus, through its interesting ``sequence of chemistries'', a major player in the Solar System's ``cosmic chemical memory''.