At the smallest scales of nature, the rules of the world shift in ways that can feel unsettling and beautiful at the same ...

Simultaneous scans: Positronium lifetime image (left) and standardized uptake value image (right) of a phantom containing tumour and adipose tissue samples, recorded using the Jagiellonian-PET scanner ...

Physicists have finally watched positronium, a short‑lived atom made of an electron and its antimatter twin, behave like a rippling quantum wave instead of a tiny billiard ball. In a set of ...

A new measurement of the exotic “atom” — consisting of an electron and its antiparticle, a positron — disagrees with theoretical calculations, scientists report in the Aug. 14 Physical Review Letters.

Most atoms are made from positively charged protons, neutral neutrons and negatively charged electrons. Positronium is an exotic atom composed of a single negative electron and a positively charged ...

All naturally-occurring chemical elements have a similar basic structure: the atomic nucleus contains protons and neutrons, and around it are electron shells. But exotic atoms, like positronium, are ...

Using a highly coherent positronium beam, the researchers observed clear diffraction patterns after transmission through a graphene film, confirming its wave-like behavior. One of the discoveries that ...

Cool experiment: the apparatus used by the AEgIS team to laser-cool positronium. (Courtesy: CERN) Researchers at CERN and the University of Tokyo have independently laser-cooled clouds of positronium.

Physicists have created molecular positronium, an entirely new object in the laboratory. Briefly stable, each molecule is made up of a pair of electrons and a pair of positrons. They made the ...

Positronium is a particle created when you bind together an electron and its antimatter counterpart, the positron. It doesn’t interact with other atoms in the way we would expect, and this discovery ...

Collision physics can be like a game of billiards. Yet in the microscopic world, the outcome of the game is hard to predict. Fire a particle at a group of other particles, and they may scatter, ...

Scientists are puzzled by an unexpectedly large gap in the energy levels of an exotic “atom” called positronium, which consists of an electron and a positron, Emily Conover reported in “Positronium ...