pion (pī`ŏn) or pi meson, lightest of the meson meson (mē`zŏn) [Gr.,=middle (i.e.
..... Click the link for more information. family of elementary particles elementary particles, the most basic physical constituents of the universe.
Molecules are built up from the atom , which is the basic unit of any chemical element .
..... Click the link for more information. . The existence of the pion was predicted in 1935 by Hideki Yukawa, who theorized that it was responsible for the force force, commonly, a "push" or "pull," more properly defined in physics as a quantity that changes the motion, size, or shape of a body. Force is a vector quantity, having both magnitude and direction.
..... Click the link for more information. of the strong interactions strong interactions, actions between elementary particles mediated, or carried, by gluons. They are responsible for the binding of protons and neutrons in the nucleus and interactions between quarks.
..... Click the link for more information. holding the atomic nucleus nucleus, in physics, the extremely dense central core of an atom .
Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons.
..... Click the link for more information. together. It was first detected in cosmic rays cosmic rays, charged particles moving at nearly the speed of light reaching the earth from outer space. Primary cosmic rays consist mostly of protons (nuclei of hydrogen atoms), some alpha particles (helium nuclei), and lesser amounts of nuclei of carbon, nitrogen,
..... Click the link for more information. by C. F. Powell in 1947. The pion is actually a multiplet of three particles. The neutral pion, π0, has a mass about 264 times that of the electron. The charged pions, π+ and π−, each have a mass about 273 times that of the electron. The neutral pion is its own antiparticle antimatter, composed of atoms made up of antiprotons and antineutrons in a nucleus surrounded by positrons. A very simple type of "atom" incorporating antiparticles is positronium, a brief pairing of a positron and an electron that may occur before their annihilation.
..... Click the link for more information. , while the negative pion is the antiparticle of the positive pion. It is now known that each pion (and, more generally, each meson) consists of a quark bound to an antiquark. Free pions are unstable. The charged pions decay with an average lifetime of 2.55 × 10−8 sec into a muon muon (my
..... Click the link for more information. of like charge and a neutrino neutrino (n
trē`nō) [Ital.
..... Click the link for more information. or antineutrino; the neutral pion decays in about 10−15 sec, usually into a pair of photons but occasionally into a positron-electron pair and a photon.
pion, pi meson
pion [′pī‚än]
..... Click the link for more information. family of elementary particles elementary particles, the most basic physical constituents of the universe.
Basic Constituents of Matter
Molecules are built up from the atom , which is the basic unit of any chemical element .
..... Click the link for more information. . The existence of the pion was predicted in 1935 by Hideki Yukawa, who theorized that it was responsible for the force force, commonly, a "push" or "pull," more properly defined in physics as a quantity that changes the motion, size, or shape of a body. Force is a vector quantity, having both magnitude and direction.
..... Click the link for more information. of the strong interactions strong interactions, actions between elementary particles mediated, or carried, by gluons. They are responsible for the binding of protons and neutrons in the nucleus and interactions between quarks.
..... Click the link for more information. holding the atomic nucleus nucleus, in physics, the extremely dense central core of an atom .
The Nature of the Nucleus
Composition
Atomic nuclei are composed of two types of particles, protons and neutrons, which are collectively known as nucleons.
..... Click the link for more information. together. It was first detected in cosmic rays cosmic rays, charged particles moving at nearly the speed of light reaching the earth from outer space. Primary cosmic rays consist mostly of protons (nuclei of hydrogen atoms), some alpha particles (helium nuclei), and lesser amounts of nuclei of carbon, nitrogen,
..... Click the link for more information. by C. F. Powell in 1947. The pion is actually a multiplet of three particles. The neutral pion, π0, has a mass about 264 times that of the electron. The charged pions, π+ and π−, each have a mass about 273 times that of the electron. The neutral pion is its own antiparticle antimatter, composed of atoms made up of antiprotons and antineutrons in a nucleus surrounded by positrons. A very simple type of "atom" incorporating antiparticles is positronium, a brief pairing of a positron and an electron that may occur before their annihilation.
..... Click the link for more information. , while the negative pion is the antiparticle of the positive pion. It is now known that each pion (and, more generally, each meson) consists of a quark bound to an antiquark. Free pions are unstable. The charged pions decay with an average lifetime of 2.55 × 10−8 sec into a muon muon (my
..... Click the link for more information. of like charge and a neutrino neutrino (n
trē`nō) [Ital...... Click the link for more information. or antineutrino; the neutral pion decays in about 10−15 sec, usually into a pair of photons but occasionally into a positron-electron pair and a photon.
pion, pi meson
Physics a meson having a positive or negative charge and a rest mass 273.13 times that of the electron, or no charge and a rest mass 264.14 times that of the electron
pion [′pī‚än]
(particle physics)
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