Scientists melted a diamond and cracked a secret of ice giants

Scientists at Lawrence Livermore National Laboratory (LLNL) have recreated the process that forms diamonds inside ice giants like Neptune and Uranus. By subjecting a diamond sample to extreme pressures and temperatures, researchers were able to observe how the solid material transitioned into a liquid state, a phenomenon known as "diamond rain."

This discovery not only resolves a 20-year-old scientific mystery but also has implications for increasing the efficiency of nuclear fusion reactors. The experiment, conducted at the University of Rochester's Omega Laser Facility, involved vaporizing the outer layer of the diamond sample and using X-ray diffraction to monitor the interior's response to a shock wave.

The resulting pressures were more than three times that of Earth's core, with temperatures equivalent to the surface of the sun. The key finding was that solid diamond is less dense than liquid metallic carbon, supporting the idea of diamond precipitation in the interiors of ice giants. This could potentially lead to a new weather phenomenon in these planets, where diamond raindrops generate friction and heat, contributing to the planets' excess energy.

Furthermore, the research suggests that diamonds may be more prevalent in the deep interiors of planets than previously thought, with billions of tons of them hidden away. The findings from this experiment could also help LLNL refine the conditions required for nuclear fusion reactions, potentially increasing the energy yield by up to three times in their fusion target experiments.