These facilities enable dense flashes of gamma rays through colliding laser pulses, simulating astrophysical conditions. Recent advances in micrometer-scale structured plasma targets have further ...

For that, you need something like this gamma-ray spectroscope. Dubbed the Pomelo by [mihai.cuciuc], the detector is a homebrew solid-state scintillation counter made from a thallium-doped cesium ...

More information: L. T. Glöggler et al, Positronium Laser Cooling via the 13S−23P Transition with a Broadband Laser Pulse, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.132.083402 ...

A high-tech sensor designed and built at the Lawrence Livermore National Laboratory (LLNL) has now traveled farther than 250 ...

That gamma rays under certain experimental conditions appear to become less penetrating as they pass through matter was shown by Dr. Gray in 1913. Recently it has been shown by me (Phil.