Neutrino


Neutrino

Neutrinos are elusive subatomic particles that result from certain nuclear reactions. Neutrinos have no electrical charge and only a tiny mass, travel at nearly the speed of light, come in three types-electron neutrinos, muon neutrinos, and tau neutrinos-and barely interact with normal matter. Because their interaction rate is so low, neutrinos produced in the core of the Sun fly directly out through the outer layers of the Sun and flood surrounding space, providing direct (though hard-to-intercept) information about nuclear reactions in the Sun's core. In 1968, however, when scientists first tried to detect electron-type neutrinos emitted by the Sun, they found less than half those expected from the then-current theory of nuclear reactions in the Sun. This shortage was known as the solar neutrino problem, and was only resolved in 2001 by elaborate experiments that proved that the Sun is in fact, producing the number of neutrinos predicted by theory, but that some of these neutrinos change type (electron to muon or tau) en route from the core of the Sun to detectors on Earth. The total number of neutrinos detected on Earth is in accord, as it turns out, with the standard model of the solar core.

History

In the 1920s, physicists noticed some discrepancies in beta decay experiments. In beta decay, a neutron decays into a proton by emitting an electron, also termed a beta particle. It was observed that the total momentum and energy of the electron and proton after the decay was sometimes less than the initial momentum and energy of the neutron. Where did the missing momentum and energy go? According to fundamental laws of physics, the total amounts of both momentum and energy must remain constant. Neither can just disappear.

In 1930, the Austrian physicist Wolfgang Pauli (1900-1958) wrote a letter to a gathering of physicists in Tübingen, Germany, in which he suggested the idea of neutrinos as the particles that carry away the missing energy. However, he did not publish the idea for another three years. Pauli originally called his suggested particle the neutron, as neutrons had not been discovered in 1930. When neutrons were discovered, the term "neutron" was taken, so Pauli's particle became the neutrino: literally, the little neutral one.

Italian physicist Enrico Fermi's (1901-1954) 1934 theory of beta decay used the neutrino hypothesis. (This theory, still used for approximate calculations, was only surpassed for more accurate calculations by theories developed in the 1970s.) But did neutrinos really exist? In the 1930s, no experiments to detect them were possible.

In 1956, after a four-year search, U.S. physicists F. Reines (1918-1998) and C. L. Cowan (1919-1974) finally succeeded in detecting neutrinos produced by the Savannah River Reactor in South Carolina. By 1962, a particle accelerator at Brookhaven National Laboratory was generating enough neutrinos to conduct detection experiments. Over several months, physicists observed a few dozen neutrino events and found that there were at least two types of neutrinos. The first one discovered was dubbed the electron neutrino, and the second the muon neutrino. Proof of a long-suspected third type of neutrino, the tau neutrino, were first found in late 1998.

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