Tag Archive for 'Antiproton'

Illustration of the production of antihyperhelium-4 in lead-lead collisions. Image credit: J. Ditzel with AI-assistance.

CERN Physicists Find First Ever Evidence of Antihyperhelium-4

Dec 16, 2024 by News Staff

Physicists with the ALICE Collaboration at CERN’s Large Hadron Collider (LHC) have seen the first ever evidence of antihyperhelium-4, which is composed...

An artistic representation of antihyperhydrogen-4 created in a collision of two gold nuclei. Image credit: Institute of Modern Physics.

Physicists Observe Antihyperhydrogen-4 for First Time

Aug 22, 2024 by News Staff

Physicists from the STAR Collaboration have observed the antimatter hypernucleus antihyperhydrogen-4 — composed of an antihyperon, an antiproton...

Artist’s impression of a cloud of trapped antihydrogen atoms. Image credit: Chukman So.

Antimatter Responds to Gravity in Same Way as Regular Matter, New Experiments Suggest

Jan 6, 2022 by News Staff

The Standard Model of particle physics is both incredibly successful and glaringly incomplete. Among the questions left open is the striking imbalance...

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 Proton’s Magnetic Moment

Nov 27, 2017 by Enrico de Lazaro

In a paper published in the journal Science, a team of physicists from Japan and Germany reports the most precise measurement ever made of the magnetic...

CERN’s BASE Experiment Reports 350-Fold Improved Measurement of Antiproton’s Magnetic Moment

Oct 19, 2017 by News Staff

In a paper published this week in the journal Nature, the BASE collaboration at CERN reports the most precise measurement ever made of the magnetic moment...

Physicists Observe Hyperfine Spectrum of Antihydrogen

Aug 7, 2017 by News Staff

In a paper published in the August 3, 2017 issue of the journal Nature, physicists with the ALPHA collaboration, a multinational project based at CERN,...

Top: schematic of the Penning trap set-up used in CERN’s BASE experiment; a cloud of antiprotons is stored in the reservoir trap (RT), which supplies single particles to the co-magnetometer trap (CT) and the analysis trap (AT) when required; the CT is used for continuous magnetic field measurements; the AT is the trap with the strong superimposed magnetic bottle, which is used to measure the cyclotron frequency and the Larmor frequency. All traps are equipped with radio-frequency excitation electronics and highly sensitive superconducting detection systems. Bottom: results of the six g-factor measurements carried out during CERN’s 2015/2016 accelerator shutdown between February 20 and March 5, 2016; based on this set of measurements H. Nagahama et al extract gp/2=2.7928465(23), as indicated by the red line; the green lines show the 95% confidence level error, the blue line represents the currently accepted value of the proton g-factor gp/2=2.792847350(9); the error bars of the individual measurements are based on the uncertainties of the individual frequency measurements, which are dominated by the random walk in the magnetron mode. Image credit: H. Nagahama et al, doi: 10.1038/ncomms14084.

Physicists Precisely Measure Magnetic Moment of Antiproton

Jan 22, 2017 by News Staff

An international team of physicists led by RIKEN researcher Stefan Ulmer has found that the magnetic moment of the antiproton is extremely close to that...

A new measurement by the STAR collaboration reveals that the force between antiprotons (p) is attractive and strong. Image credit: Brookhaven National Laboratory.

Physicists Measure Force of Interaction between Antiprotons

Nov 5, 2015 by News Staff

According to a large international team of physicists, the attractive force between antiprotons is similar to that between protons. A new measurement by...

The times and vertical (y) annihilation locations (green dots) of 10,000 simulated antihydrogen atoms in the decaying magnetic fields. There is a tendency for the anti-atoms to annihilate in the bottom half of the trap, as shown by the black solid line. The blue dotted line includes the effects of detector azimuthal smearing on the average; the smearing reduces the effect of gravity observed in the data. The red circles are the annihilation times and locations for 434 real anti-atoms, as measured by the particle detector (A. E. Charman, the ALPHA Collaboration)

Physicists Attempt to Measure Gravitational Mass of Antihydrogen

May 1, 2013 by News Staff

A team of researchers working with CERN’s Antihydrogen Laser Physics Apparatus (ALPHA) has reported the first direct measurement of gravity’s effect...

Physicists Measure Magnetic Moment of Single Antimatter Particle

Mar 26, 2013 by Sergio Prostak

A research team led by Harvard University scientists has measured the magnetic moment of the antiproton more accurately than ever before. Antiproton annihilation....