Present-day research opportunities with γ-quasimonochromatic beams

An overview of the main directions of present-day studies with γ quasimonochromatic beams are discussed with an emphasis on the research opportunities which will be offered at the Extreme Light Infrastructure Nuclear Physics (ELI-NP) facility at Magurele near Bucharest in Romania. Experiments with γ beams at the extremes of high temperature and high neutron-to-proton ratios are outlined. Some of the experimental setups for nuclear structure, reaction and astrophysics studies, which are available at ELI-NP, are described. Perspectives for studies of exotic nuclei within the Gamma Factory experiment at CERN are discussed. The expected fission-fragment yields at the Gamma Factory are presented. The perspectives for nuclear structure studies with γ rays with orbital angular momentum are outlined. Key Words: active-target experiments, ion trapping, ion transport, multidetector arrays, nuclear astrophysics, nuclear structure, photonuclear reactions, photofission, quasimonochromatic γ beams, twisted photons. (author)