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64 papers · 1 filter
An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations
Rana Ezzeddine, Thibault Merle, Bertrand Plez +3
We investigate the role of hydrogen collisions in NLTE spectral line synthesis, and introduce a new general empirical recipe to determine inelastic charge transfer (CT) and bound-b…
Ultra metal-poor stars: Spectroscopic determination of stellar atmospheric parameters using iron Non-LTE line abundances
Rana Ezzeddine, Anna Frebel, Bertrand Plez
We present new ultra-metal-poor (UMP) stars parameters with [Fe/H]<-4.0 based on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an up-to-date iron model a…
Tracing the first stars and galaxies of the Milky Way
Brendan F. Griffen, Gregory A. Dooley, Alexander P. Ji +3
We use 30 high-resolution dark matter halos of the simulation suite to probe the first stars and galaxies of Milky Way-mass systems. We quantify the environment of th…
-particle energy-summing correction for -delayed proton emission measurements
Z. Meisel, M. del Santo, H. L. Crawford +6
A common approach to studying -delayed proton emission is to measure the energy of the emitted proton and corresponding nuclear recoil in a double-sided silicon-strip detector (…
The Origin of the Heaviest Metals in Most Ultra-Faint Dwarf Galaxies
Ian U. Roederer
The heaviest metals found in stars in most ultra-faint dwarf (UFD) galaxies in the Milky Way halo are generally underabundant by an order of magnitude or more when compared with st…
Symmetry Parameter Constraints From A Lower Bound On The Neutron-Matter Energy
Ingo Tews, James M. Lattimer, Akira Ohnishi +1
We propose the existence of a lower bound on the energy of pure neutron matter (PNM) on the basis of unitary-gas considerations. We discuss its justification from experimental stud…