Tag Archive for 'Antimatter'

Enoto et al describe how gamma rays from lightning react with the air to produce radioisotopes and even positrons. Image credit: Teruaki Enoto, Kyoto University.

Lightning Strikes Produce Antimatter Particles in Earth’s Atmosphere

Nov 23, 2017 by News Staff

Scientists from Japan and Singapore report in the November 23 issue of the journal Nature that they observed positron (antimatter counterpart of the electron)...

HAWC map for the region around Geminga (about 815 light-years away in the constellation Gemini) and PSR B0656+14 (about 940 light-years away). Image credit: John Pretz.

Nearby Pulsars Shed Light on Origin of Excess Antimatter

Nov 17, 2017 by News Staff

Astrophysicists using the High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory in Mexico have detected the extended emission of high-energy gamma...

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

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,...

This composite image shows the central region of the Milky Way Galaxy. Image credit: NASA / JPL-Caltech / ESA / CXC / STScI.

Astrophysicists Solve Mystery of How Most Antimatter in Milky Way Galaxy Forms

May 30, 2017 by News Staff

Australian National University astrophysicist Dr. Roland Crocker and his colleagues from Europe, New Zealand, Australia and the United States have shown...

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...

CERN Physicists Observe Light Spectrum of Antimatter for the First Time

Dec 19, 2016 by News Staff

Physicists from CERN’s ALPHA experiment today report the first ever measurement on the optical spectrum of an antimatter atom. Artist’s impression...

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...

An artist's conception of a Majorana fermion floating at the surface of the Fermi sea. Image credit: Alexey Drjahlov.

Majorana Fermion: Physicists Observe Elusive Particle

Oct 6, 2014 by News Staff

The Majorana fermion – a mysterious particle that is its own antiparticle – has been observed for the first time. An artist’s conception...

ASACUSA's experimental apparatus. Image credit: CERN.

CERN Scientists Create Antihydrogen Atoms

Jan 22, 2014 by News Staff

Physicists from CERN’s Atomic Spectroscopy and Collisions Using Slow Antiprotons (ASACUSA) project say they have produced at least 80 atoms of antihydrogen. Hydrogen’s...

Scientists Detect Antimatter Particles in Solar Flares

Jul 9, 2013 by Sergio Prostak

Researchers from the United States and Russia analyzing microwave and magnetic-field data from solar-dedicated facilities and spacecraft have reported...

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...

The B0 and B0s meson decays into K and π mesons were studied by CERN scientists. The decay into a negative K meson red track and a positive π green track is show here (LHCb experiment)

CERN Physicists Observe New Matter-Antimatter Difference

Apr 25, 2013 by Sergio Prostak

Scientists from CERN’s Large Hadron Collider beauty (LHCb) experiment have reported the first observation of matter-antimatter asymmetry in the decays...

The International Space Station taken during STS-134 mission's fourth spacewalk. The Alpha Magnetic Spectrometer (AMS) was installed one week earlier during the mission's first spacewalk (NASA)

Antimatter Hunter aboard International Space Station Detects Hints of Dark Matter

Apr 4, 2013 by Natali Anderson

An international team of scientists using the Alpha Magnetic Spectrometer aboard the International Space Station has announced the first results in the...

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....