No abstract

Nuclear masses have long been recognized as key nuclear physics inputs for calculations of rapid neutron capture, or r-process, nucleosynthesis. Here we investigate how uncorrelated uncertainties in nuclear masses translate into uncertainties in the final abundance pattern produced in r-process simulations. These uncertainties can obscure details of the abundance pattern that in principle could be used to diagnose the r-process astrophysical site. We additionally examine the impact of reductions of mass uncertainties that will come with new experiments.

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ATHENA has been designed as a general purpose detector capable of delivering the full scientific scope of the Electron-Ion Collider. Careful technology choices provide fine tracking and momentum resolution, high performance electromagnetic and hadronic calorimetry, hadron identification over a wide kinematic range, and near-complete hermeticity. This article describes the detector design and its expected performance in the most relevant physics channels. It includes an evaluation of detector technology choices, the technical challenges to realizing the detector and the R&D required to meet those challenges.