NP Highlights

A photon is absorbed by the ground state of helium-4. This excites the transition to the first excited state of helium-4, which sits just above the energy threshold for separation into a proton and a hydrogen-3 nucleus.
New calculations confirm recent experimental results on the transition between the alpha particle and its first excited state.
Physicists modeled gold-gold collisions at different energies to probe fluid properties over a range of temperatures and baryon densities. The dashed line represents the region where ordinary nuclear matter is expected to transition to free quarks and gluons.
Scientists use a large-scale statistical analysis to extract the viscosity of hot, dense nuclear matter created at different heavy ion collision energies.