Femtometre

The hydrogen atom was once considered the simplest atom in nature, composed of a structureless electron and a structured proton. However, as research progressed, scientists discovered a simpler type of atom, consisting of structureless electrons, muons, or tauons and their equally structureless antiparticles. These atoms are bound together solely by electromagnetic interactions, with simpler structures than…

Study by the University of Bonn and the TU Darmstadt suggests errors in the interpretation of older measurements. A few years ago, a novel measurement technique showed that protons are probably smaller than had been assumed since the 1990s. The discrepancy surprised the scientific community; some

A team of chemists and physicists with members from Kyoto University, the Nishina Center for Accelerator-Based Science, RIKEN, Rikkyo University and Tohoku University, all in Japan, have for the first time observed electron scattering from radioisotopes that do not occur naturally. The study is published in the journal Physical Review Letters.

This new particle is so small it makes an atom look enormous.

With the help of shape-shifting ghost particles, 'DUNE' could unlock all-new physics.

Three-body nuclear systems are key to many aspects of modern nuclear physics, such as understanding the equation of state of high-density nuclear matter and the composition of neutron star cores.

Long-anticipated experiments that use light to mimic gravity are revealing the distribution of energies, forces, and pressures inside a subatomic particle for the first time.

This is the first time that electron scattering has been observed and recorded.

2.) Nuclear scales. On femtometer (~10^-15 m) scales, individual nucleons, composed of quarks and gluons, bind together. 4.) Molecular scales. Nanometers (~10^-9 m) and larger, molecules contain…

A first-of-its-kind probe brings physicists one step closer to solving the proton radius puzzle

The novel method relies on particles of light that surround gold ions as they speed around the collider and a new type of quantum entanglement that's never been seen before.

Physicists with the ALICE Collaboration at CERN's Large Hadron Collider (LHC) have seen the first ever evidence of antihyperhelium-4, which is composed of two antiprotons, an antineutron and an antilambda.

A newly discovered interaction related to quantum entanglement between dissimilar particles opens a new window into the nuclei of atoms

First-ever observation of quantum interference between dissimilar elementary particles offers new approach for mapping distribution of gluons in atomic nuclei—and potentially more.

MIT researchers find that when measuring a nucleus with a certain "magic" number of neutrons — 82 — the magnetic field of the nucleus exhibits a drastic change, and the properties of these very complex nuclei appear to be governed by just one of the protons of the nucleus.

Inside every cellphone lies a tiny mechanical heart, beating several billion times a second. These micromechanical resonators play an essential role in cellphone communication. Buffeted by the cacophony of radio frequencies in the airwaves, these resonators select just the right frequencies for transmitting and receiving signals between mobile devices.

Quantum electrodynamics (QED) atoms are composed of unstructured and point-like lepton pairs bound together by the electromagnetic force.

Physicists from the Eötvös Loránd University (ELTE) have been conducting research on the matter constituting the atomic nucleus utilizing the world's three most powerful particle accelerators. Their focus has been on mapping the "primordial soup" that filled the universe in the first millionth of a second following its inception.

To study atomic nuclei and subatomic particles, scientists use the Large Hadron Collider (LHC) to collide heavy ions—atomic nuclei completely stripped of their surrounding electrons. In these collisions, the quarks and gluons that normally make up nucleons (protons and neutrons) melt into a new state of matter called a quark-gluon plasma (QGP).

In neutron stars, astrophysicists see a form of matter like none other.