Tag Archive for 'Compton scattering'

This artist’s concept depicts the central region of the blazar BL Lacertae, a supermassive black hole surrounded by a bright disk and a jet oriented toward Earth. Image credit: NASA / Pablo Garcia.

Interactions between Fast-Moving Electrons and Photons Lead to X-ray Emission from Blazar Jets

May 7, 2025 by News Staff

In new research, astronomers used NASA’s IXPE (Imaging X-ray Polarimetry Explorer) to observe a highly relativistic jet emanating from the blazar BL...

2D display of the quark contribution to the distribution of forces in the proton as a function of the distance from the proton’s center. The light gray shading and longer arrows indicate areas of stronger forces, while the dark shading and shorter arrows indicate areas of weaker forces. Left panel: normal forces as a function of distance from the center; the arrows change magnitude and always point radially outward. Right panel: tangential forces as a function of distance from the center; the force changes direction and magnitude as indicated by the direction and length of the arrow; the forces change sign near 0.4 fm from the proton center. Image credit: Burkert et al., doi: 10.1103/RevModPhys.95.041002.

Physicists Determine Distribution of Strong Force inside Proton

Jan 24, 2024 by News Staff

The physics of the gravitational form factors of the proton, as well as their understanding within quantum chromodynamics, has advanced significantly in...

Proton is a subatomic particle found in the nucleus of every atom. This artist’s impression shows a proton and a neutron. Image credit: Joanna Griffin / Jefferson Lab / Penn State.

Physicists Precisely Measure Electric Polarizability of Proton

Oct 19, 2022 by News Staff

Though widely thought to be a fluke when seen in earlier measurements, the new, more precise measurement has confirmed the presence of the anomaly and...