FRIB400: Creating Neutron-Rich Dense Matter, Messengers from Earth*

In order to understand astrophysical phenomena and the origin of the elements, it is important to understand the properties of nuclear matter, nuclei, and their interactions. A wide range of properties of nuclei and nuclear matter are important and many of the isotopes involved are unstable and very neutron rich. To performexperiments with such isotopes rare-isotope beam facilities have been and are being built. In addition, significant upgrades and additions are planned to gain access to the most neutron-rich isotopes. At the Facility for Rare Isotope Beams (FRIB), and upgrade in beam energy, from ~200 MeV/nucleon to ~400 MeV/nucleon is planned. In addition, a High Rigidity Spectrometer (HRS) is being constructed. Both of these cotribute strongly to providing access to nuclei of most interest for understanding nuclear astrophysics phenomena. Moreover, the HRS r provides a unique environment for studying neutron-rich (dense) matter through a wide range of experiment opportunities to researchers seeking to understand multi-messenger signals from the universe.