are neutrinos their own antiparticles?
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If neutrinos are their own antiparticles, it's possible that the antineutrinos emitted during double beta decay could annihilate one another and disappear, violating lepton number conservation. This is called neutrinoless double beta decay. Such a process would favor matter over antimatter, creating an imbalance.
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The weak interaction acts on both hadrons and leptons. Hadrons are viewed as being composed of quarks, either as quark-antiquark pairs (mesons) or as three quarks (baryons).
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The 12 elementary particles of matter are six quarks (up, charm, top, Down, Strange, Bottom) 3 electrons (electron, muon, tau) and three neutrinos (e, muon, tau). Four of these elementary particles would suffice in principle to build the world around us: the up and down quarks, the electron and the electron neutrino.
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Protons and neutrons are made of quarks, but electrons aren't. As far as we can tell, quarks and electrons are fundamental particles, not built out of anything smaller. ... It's not just matter: light is also made of particles called photons.
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Muons were formerly called "mu mesons", but are not classified as mesons by modern particle physicists (see § History), and that name is no longer used by the physics community. ... Because muons have a greater mass and energy than the decay energy of radioactivity, they are not produced by radioactive decay.
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Neutrinos—ghostly subatomic particles—may have been observed traveling faster than the speed of light, scientists announced this week.
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You can make matter out of nothing, but when every you do you also create an antiparticle which would destroy the matter once they make contact. The reason being that mass-energy must be conserved. ... One gets sucked in, and the other get spit out, resulting in some matter being created from 'nothing'.
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There are two types of subatomic particles: elementary and composite particles. There are 36 confirmed fundamental particles, including anti-particles, according to Professor Craig Savage from the Australian National University.
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Hadrons. Nearly all composite particles contain multiple quarks (antiquarks) bound together by gluons (with a few exceptions with no quarks, such as positronium and muonium).
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The key is that our universe is mostly made of regular matter, so antimatter cannot stick around for very long. Very soon after antimatter is created, it bumps into regular matter and gets destroyed again. ... Dark matter is matter that does not interact electromagnetically, and therefore cannot be seen using light.
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Beta particles are high energy electrons. These electrons are not electrons from the electron shells around the nucleus, but are generated when a neutron in the nucleus splits to form a proton and an accompanying electron. Beta particles are negatively charged. ... Gamma rays have no electrical charge associated with them.
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In beta minus decay, a neutron decays into a proton, an electron, and an antineutrino: n Æ p + e - +. In beta plus decay, a proton decays into a neutron, a positron, and a neutrino: p Æ n + e+ +n. ... However within a nucleus, the beta decay process can change a proton to a neutron.
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ELEMENTARY, MY DEAR PARTICLE Scientists refer to elementary particles as "fundamental." There are three types of elementary particles: quarks, leptons, and bosons. hadrons are made of quarks and therefore are not fundamental.
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Because neutrinos are particles and have mass then yes, they are affected by gravity. ... Since we can see that photons bend their stream while passing planets and other large gravitational masses it lends credence to the idea that invisible neutrinos will bend in gravitational fields as well.
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Neutrons and protons are in the nucleus. There are no electrons in the nucleus. Note that a neutron is not composed of a proton and an electron. Some other particles that are not in the nucleus: positrons, neutrinos, antineutrinos, antiprotons, antineutrons, muons, etc.
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The second mediator particle discovered (after the photon) was the pion. In 1935, Japanese physicist Hideki Yukawa (1907–1981) formulated the idea that protons and neutrons were held together by a nuclear force that was mediated by a particle called the pion.
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Alpha particles are energetic (fast) helium nuclei, beta particles are smaller and have half the charge, being energetic electrons (or positrons) only the gamma particles are photons, i.e., they are not massive particles at all, they are a form of electromagnetic radiation, a form more energetic than X-rays.