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Effective Nucleon Masses in Compressed and Expanding Neutron-Rich Matter: Motivation. Multiple simulations suggest sensitivity of the n/p single and double ratios to both the nucleon effective mass and symmetry energy Previously, an experiment measured these at one beam energy (50 MeV/A).

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## Effective Nucleon Masses in Compressed and Expanding Neutron-Rich Matter: Motivation

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**Effective Nucleon Masses in Compressed and Expanding**Neutron-Rich Matter: Motivation • Multiple simulations suggest sensitivity of the n/p single and double ratios to both the nucleon effective mass and symmetry energy • Previously, an experiment measured these at one beam energy (50 MeV/A). • Re-measure and add additional beam energy (120 MeV/A) • Symmetric 112,124Sn reactions • Data is cut on central collisions and 70<qC.M.<110 ImQMD: Tsang, PRL 102, 122701 (2009) ImQMD-Sky: Coupland, Ph.D. Thesis (2013) pBUU: Youngs, Ph.D. Thesis (2013) Mike Youngs, Texas A&M University (presenting work from Michigan State University), Low Energy Community Meeting, August 2014**Results**CI = Coalescence Invariant Coupland(2014) Submitted to Science Mike Youngs, Texas A&M University (presenting work from Michigan State University), Low Energy Community Meeting, August 2014**Looking Forward/What’s Needed**• Better understanding of the discrepancies between simulated and experimental data at low emission energy. • A wider collection of neutron kinetic energy spectra • Varying beam energy, mass and asymmetry • NEED a good understanding of background and detection efficiency • Bonus: potentially useful for a better understanding of clustering mechanisms • Potentially useful datasets of neutron spectra: • Symmetric 40,48Ca • Symmetric 64,70Zn • 132Sn+124Sn, 108Sn+112Sn • Useful beam energies: • 15-30 MeV/A for low density regimes (subsaturation) • 50 and 120 MeV/A for comparison to existing measurements • 200 MeV/A or higher for higher density regimes (supersaturation) • Large range of other observables can be measured simultaneously Mike Youngs, Texas A&M University (presenting work from Michigan State University), Low Energy Community Meeting, August 2014

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