Sentences with phrase «kev neutrino»

The nucleosynthesis calculations are still affected by the memory of the presence of the 17 keV neutrino.

However, if the lifetime of the 17 keV neutrino was so short that it has decayed at an early stage of the big bang, this could explain present helium levels.

So in the very early Universe, some 17 keV neutrinos could have been transformed into electron neutrinos before they could decay, adding to the pressure of the big bang.

Not exact matches

Under laboratory conditions, the neutrinos emitted in this reaction have an energy of 861.84 kiloelectronvolts (keV).

But Bahcall calculates on the basis of the standard astrophysical theory of the conditions at the heart of the Sun, the solar neutrinos produced in this reaction will have a higher energy of 862.27 keV (Physical Review Letters, vol 71, p 2369).

The evidence for a neutrino with a mass of 17 keV came from particle physicists who observed the decay of some atomic nuclei and found a «kink» in the energy spectrum of neutrinos produced.

Although the mass of such a neutrino is small (17 keV compared with about 500 keV for an electron), neutrinos are thought to be so common in the Universe that they could have a profound influence on the way the Universe has evolved.

Does a «heavy» neutrino exist with a mass of 17 kiloelectronvolts (keV)?

One is likely a 7.1 keV sterile neutrino, and the other appears to be a 35 GeV WIMP.