Perspectives for a thick liquid hydrogen target and vertex tracker for neutron invariant-mass measurement at FRIB*

The understanding of the nuclear forces at play inside the nucleus is one of the major goal of modern nuclear physics. In particular, the study of phenomena arising in nuclei located near or beyond the neutron dripline, such as shell evolution, deformation, halo formation, provides a wealth of information that challenge our current knowledge. The Facility for Rare Isotope Beams (FRIB) offers the unique opportunity to extend such studies to dripline nuclei in the medium-mass region thanks to higher beam intensities. The spectroscopy of unbound states in this region will reveal phenomena at play and probably allow for the discovery of new ones. As a high density of states are expected for such nuclei, the development of a high-resolution and high-luminosity experimental setup for neutron invariant-mass spectroscopy is paramount. The use of a thick liquid target and tracker array at FRIB in combination to the MoNA array would enhance the current capabilities. In this talk, the preliminary design and summary of the expected capabilities in terms of luminosity and resolution will be presented.