Shanghai Institute of ultra-short ultra-short laser successfully generated antimatter

Each particle has an opposite antiparticle. In 1932, Karl Anderson, an American physicist, experimentally confirmed the antiparticle of electrons, that is, the existence of positrons. In 1936, Anderson received the Nobel Prize in Physics for his discovery of positrons. Antimatter research in high-energy physics, the evolution of the universe is of great significance, but also has important applications, such as positron emission tomography (PET) has been widely used in cancer diagnosis.

Shanghai National Institute of Optics and Physics Laser Physics National Laboratory use of femtosecond Pawa laser devices and high pressure gas target interaction (Figure 1), resulting in a large number of high-energy electron, high-energy electron and high Z material target interaction by the radiation mechanism Produce high-intensity gamma rays, gamma rays and then the high-Z nuclei produce positive and negative pairs of electrons. Positron emission tomography was carefully designed to successfully solve the problem of noise caused by gamma rays. By using the different deflection characteristics of the positive and negative electrons in the magnetic field, the positron was successfully observed in the single-shot experiment. This is the first time that our country has reported the use of laser to produce antimatter. [PHYSICS OF PLASMAS 23, 033109 (2016)]

As early as in 2001, Shanghai Institute of Optics and Fine Mechanics began the theoretical research on generating super-short and ultra-short electron pairs, and proposed the use of strong laser and nano-film target interaction to produce positive and negative electron pairs. [PHYSICAL REVIEW E (2001)] This work has gained worldwide attention. Three articles reviewed in REVIEWS OF MODERN PHYSICS (Impact Factor 30) and two in Plasma Phys. Rep At the same time, five papers published in Phys. Rev. Lett. Cite this work.

Ultra-fast super-short laser generated by the fast electron source, nondestructive detection of materials has a major application. (Strong Field Laser Physics State Key Laboratory)

Figure 1: Posterior ultrashort laser positrons generated schematic

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