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

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 ...

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 ...

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 ...

One of the discoveries that fundamentally distinguished the emerging field of quantum physics from classical physics was the observation that matter behaves differently at the smallest scales. A key ...

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.

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 ...

First experimental observation of matter-wave diffraction in a short-lived electron-positron atom using a graphene-based diffraction grating. (Nanowerk News) One of the discoveries that fundamentally ...

It's extremely rare and usually exists for just 142 billionths of a second. Positronium can generate huge amounts of energy. It can shed light on 'antimatter' which existed at the beginning of the ...

The quenching signal would look the same whether it were due to Ps 2 formation or SEQ, because both of these mechanisms essentially convert long-lived triplet Ps into the short lived singlet state. We ...