The physicists calculated the new particle's mass at 6.2 billion electronvolts
, about six times that of a proton and very close to theorists' predictions.
If the Higgs particle has a mass at the high end of its predicted range, about 115 billion to 200 billion electronvolts
, it should be easily detected, its decay products standing out dramatically against the background of particle debris from other processes.
Her team found that the X rays peaked at an energy of 10,000 electronvolts
. Using that information, the team calculated the energy carried by particles in the jets.
As much as I hate to disagree, the "Chart of the Nuclides for Naval Reactors, USDOE, that I have hanging on my wall lists the half-life of bismuth-209 as greater than or equal to 2 x [10.sup.18] years with an alpha-particle-decay mode of 3.07 million electronvolts
One study focuses on lower-energy cosmic rays that originate within our galaxy and have energies up to 1,000 trillion electronvolts
. The findings support the popular notion that the particles are generated by shock waves from supernovas, the explosive death of massive stars.
So-called killer electrons, which are charged particles revved up to energies greater than 1 million electronvolts
, punch through the skin of spacecraft.
148), researchers now report that they've pinned down the origin of the background at energies where it had remained most elusive--above 2,000 electronvolts
. The results suggest that supermassive black holes lurking at the cores of galaxies are far more common than visible-light observations have revealed.
The ions--a searing beam of 30 trillion protons, with energies up to 50 million electronvolts
(MeV)--burst from the far side of the target.