Noun
an elementary, electrically neutral particle with a very small mass
Source: WordNetSpace-time in an expanding universe changes over time, so the full quantum description of a neutrino. in that type of universe is different in the past and the future. Neutrinos would behave in both expanding and unchanging "steady state" universes. Jayant Narlikar
I turned my attention for a while to gamma ray astronomy and soon began the first in a continous series of experiments at the Savannah River site to study the properties of the neutrino. Frederick Reines
Accelerator neutrinos Some particle accelerators have been used to make neutrino beams. Source: Internet
Although Super-K had beaten SNO to the punch, having published evidence for neutrino oscillation as early as 1998, the Super-K results were not conclusive and did not specifically deal with solar neutrinos. Source: Internet
Although their density is quite high, they have not yet been observed in the laboratory, as their energy is below thresholds of most detection methods, and due to extremely low neutrino interaction cross-sections at sub-eV energies. Source: Internet
A neutrino is still emitted in this process, and a proton changes to a neutron. Source: Internet