<P> There are other possibilities in which neutrino could oscillate even if they were massless . If Lorentz symmetry were not an exact symmetry, neutrinos could experience Lorentz - violating oscillations . </P> <P> Neutrinos traveling through matter, in general, undergo a process analogous to light traveling through a transparent material . This process is not directly observable because it does not produce ionizing radiation, but gives rise to the MSW effect . Only a small fraction of the neutrino's energy is transferred to the material . </P> <Table> <Tr> <Th> Antimatter </Th> </Tr> <Tr> <Td> </Td> </Tr> <Tr> <Td> Annihilation </Td> </Tr> <Tr> <Td> Devices (show) <Ul> <Li> Particle accelerator </Li> <Li> Penning trap </Li> <Li> Wilson chamber </Li> </Ul> </Td> </Tr> <Tr> <Td> Antiparticles (show) <Ul> <Li> Positron </Li> <Li> Antiproton </Li> <Li> Antineutron </Li> </Ul> </Td> </Tr> <Tr> <Td> Uses (show) <Ul> <Li> Positron emission tomography </Li> <Li> Fuel </Li> </Ul> </Td> </Tr> <Tr> <Td> Bodies (show) <Ul> <Li> ALPHA Collaboration </Li> <Li> ATHENA </Li> <Li> ATRAP </Li> <Li> CERN </Li> <Li> RHIC </Li> </Ul> </Td> </Tr> <Tr> <Td> People (show) <Ul> <Li> Paul Dirac </Li> <Li> Carl David Anderson </Li> <Li> Andrei Sakharov </Li> </Ul> </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> </Table> <Tr> <Th> Antimatter </Th> </Tr>

The neutrino has no mass no electrical charge and no magnetic field