Abstract The Gamma Factory (GF) is an ambitious proposal, currently explored within the
CERN Physics Beyond Colliders program, for a source of photons with energies up to≈ 400 …

Quantum optics with X-rays has long been a somewhat exotic activity, but it is now rapidly
becoming relevant as precision x-ray optics and novel X-ray light sources, and high-intensity …

X-ray-driven gamma emission describes processes that may release nuclear energy in a
'clean'way, as bursts of incoherent or coherent gamma rays without the production of …

The fundamentals of a consistent approach, based on a relativistic energy formalism
(adiabatic Gell-Mann and Low formalism) and the multiphoton emission and absorption …

The direct interaction of nuclei with superintense laser fields is studied. We show that
present and upcoming high-frequency laser facilities, especially together with a moderate …

Group velocity control is demonstrated for x-ray photons of 14.4 keV energy via a direct
measurement of the temporal delay imposed on spectrally narrow x-ray pulses. Subluminal …

A newly developed dual Mössbauer spectrometer with an integrated time-to-digital converter
(TDC) is described in detail. This spectrometer enables variety of Mössbauer experiments in …

The coherent storage and phase modulation of x-ray single-photon wave packets in the
resonant scattering of light off nuclei is theoretically investigated. We show that by switching …

A significant reduction of absorption for single gamma photons has been experimentally
observed by studying Mössbauer spectra of F 57 e in a F e CO 3 crystal. The experimental …

Generation of single-photon entanglement is discussed in nuclear forward scattering. Using
successive switchings of the direction of the nuclear hyperfine magnetic field, the coherent …