On July 2, in their final analysis, Fermilab physicists reported that they could narrow the Higgs mass range only to between 115 billion and 135 billion electron volts
, with a statistical significance of 2.
9 percent of the speed of light, creating a beam with a total energy of 11 million electron volts
Combined data from two experiments at Fermilab's Tevatron particle accelerator indicate that the elusive Higgs boson does not have a mass between 158 and 175 billion electron volts
The first high-energy beam was achieved using ALICE's photoinjector, which fired a beam of electrons into a superconducting linear accelerator, creating a particle beam with a total energy of nearly four and a half million electron volts
5 electron volts
(the energy units that are commonly used to express tiny masses).
18 trillion electron volts
, obliterating the previous record of 0.
A year's worth of observations by the satellite's Energetic Gamma Ray Experiment Telescope (EGRET) were combined to produce this false-color view of the cosmos at energies above 100 million electron volts
12~ electron volts
were found coming from a much closer object: the dwarf binary star AE Aquarii, 275 light-years distant and well known to amateur variable star observers for a half century.
One of the craft's detectors recorded a 100-fold surge in the intensity of certain charged particles--electrons greater than 350,000 electron volts
and protons ranging in energy from 40,000 eV to more than 70 million eV.
Compton's Energetic Gamma Ray Experiment Telescope detected photons from this event with energies exceeding a billion electron volts
05 electron volts
(eV), or about a 10-millionth the mass of the electron.
The instrument counted photons with energies greater than 100 million electron volts
, produced when high-energy cosmic-ray particles (electrons and atomic nuclei) collide with interstellar material.