Positron positron
, also known as positron, anti-electron, positron, an elementary particle with positive charge, equal to the quality and e is the electron anti-particles. Also called the positron. Was first predicted by the Dirac theory. August 2, 1932, California Institute of Technology's Anderson, who solemnly declared to the world, they discovered the positron. The discovery is the use of positron cloud chamber to observe the. Filled in the cloud chamber gas saturated ether, when the substances emitted are electrons, positrons through the cloud chamber, in positron droplets line appears in orbit, the external magnetic field measured by positron direction and the radius on the deflection know it's charged symbols, and the charge to mass ratio (the ratio with the power and quality) to determine the nature of the positron. The discovery opened up a positron antimatter research in the field.
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Introduction to the definition found in positron theory that discovery of the electron profile was found in Anderson before the fact, there were a couple of scientists - Joliot Curie (Pierre * Pierre and Marie Curie's son and daughter) first observed the existence of the positron, but this did not attract their attention, and thus missed out on this great discovery. This Curies also made outstanding contributions to humanity, in addition to their discovery of the electron is missing, but also as the discovery of the neutron and missed the discovery of nuclear fission, which come in three times the threshold of the Nobel Prize in Physics And finally failed to break into. But their outstanding contribution in the radioactive areas, they still won the 1935 Nobel Prize in Chemistry. Positron, the mass m = 9.1 × 10-31 kg, charge is g = +1.6 × 10-19 Coulomb, spin and electronic same. How is a positron detected it? This requires the help of the electromagnetic field in the cloud chamber. Applications we know that each of these substances are present saturated vapor pressure [1], when the external pressure is greater than the saturated vapor pressure of the substance when the substance of the steam began to condense into droplets. However, if the vapor is pure, then even if the external pressure exceeds its saturation vapor pressure, but does not automatically condensed steam, which becomes saturated gas. If at this time in a saturated gas with a small perturbation, such as the presence of charged particles or other impurities in the presence of impurities in the gas will be the core of this rapidly condenses into small droplets. So when the charged particles in a saturated steam in the flight, the steam will be along the flight track particle coagulation, which we track through the observation of these droplets, you can know the movement of particles, this is the cloud chamber, is by the famous Wilson physicists invented. The definition of positron positron (Positron, e +), also known as positron positron is the antiparticle of electrons, in addition to positive charge, other properties and electronic same. Positron is unstable particles, electrons experience with what happens to annihilation (Annihilation), emits two gamma photons (gamma ray photon), each energy 0.511MeV. When contact is electronic and nuclear, it will happen with the extranuclear electron annihilation, and this is the principle of positron gun. Positron is not a matter of basic components on the planet. Positron is a relatively stable, but one would quickly run into e-annihilation and into a photon can not be easily observed. Positron Annihilation (6) is reminiscent of the discovery of the electron exists antiproton, neutron ......, each particle has now been confirmed that there is a corresponding anti-particle, and it was envisaged, with anti-particle manufacturing antimatter (such as anti-hydrogen atoms), the other particles in the body of the access is to create anti-hydrogen atoms towards the big step. matter and antimatter in the binding of (Annihilation), can release large amounts of energy (than nuclear energy orders of magnitude), the future may bring some kind of spacecraft material and the substance of antimatter as an energy source. To achieve the great human dream of manned exploration of Mars, we need a few tons of chemical fuel, on the contrary, if the use of anti-matter, the only scores mg, theoretical speed limit of up to one-tenth of the speed of light. However, in fact, the birth of this power also comes with a price. Some antimatter reactions produce a large number of high-energy gamma rays. Gamma ray irradiation on steroids like the X-ray, they are able to penetrate the material, the decomposition of intracellular molecules, so they would be harmful. In addition, the high-energy gamma rays because the atomic material would make engine broken, let the engine itself is radioactive. The United States is developing antimatter spacecraft, now has a prototype LY, but can not take people, put up the biological test, you certainly could not guess the result, not just death, is mysteriously disappear, does not exist, the instrument measured the organisms into gamma rays, and so exaggerated the spacecraft which
pilot dare go. Although that theory has been found that theoretical predictions of positron, but the experiment has not been found. At that time the scientific community and the scientific community is now pursuing the discovery of new particles in the atmosphere is different does not readily admit the existence of new particles. At that time only the positively charged proton particles, so it was that the Dirac equation appears in the positively charged proton particles is very likely, or why the experiment did not find it? The idea I have had,
Buy Vibram Five Fingers Bikila, including Dirac. It was found that long after 1932, Dirac's prediction was soon confirmed by experiments, it was Anderson, American physicist (1905-1991) in the study of cosmic ray deflection in the case of the magnetic field detected. At that time, he is working with Millikan (determined by the basic charge) come together to study cosmic rays are electromagnetic radiation or particles in question. Most people agree that Compton was the argument that cosmic rays are charged particles, Millikan am very satisfied. Anderson then trying to figure out into the cosmic ray cloud chamber in a strong magnetic field will not turn. He shot in the cloud chamber in a picture, this photo that he did not sleep a wink all night. He found that cosmic rays enter the cloud chamber through the stereotype, the locus of bending does occur, and, in the high-energy cosmic rays through the stereotype, there is a particle trajectory and the trajectory of e exactly the same, but the direction is bent wrong This means that previously unknown particles and the electron mass the same, but the charge is the opposite, and this is exactly the Dirac predicted anti-electrons. Anderson was not aware of Dirac's prediction, he found the particle called the The next year, Anderson and produced by γ-ray method of positron bombardment, which from the experiment has fully confirmed the existence of positron. Since then, they are formally included in the e-ranks of elementary particles. Positron discovery aroused great interest. Quickly identify, not only exist in the positron in cosmic rays, and radioactive nuclear participate in some nuclear reaction, you can also find the positron track. It was found that the use of energy above 1 MeV γ-ray radiation stereotype, thin metal foil, and other gaseous media are likely to observe the emergence of a positron. And general e-positron pairs always produced the opposite charges carried by them, which always bend in the magnetic field in different directions, in addition, e-annihilation into a photon of argument has also been experimental evidence. Zhao Zhongyao is the first observed antimatter annihilation, is also the first to discover the history of physics, the anti-matter physicist. This discovery won the Nobel Prize enough to Zhao Zhongyao, when the Swedish Royal Society has awarded him the Nobel Prize seriously considered. Unfortunately, there is a physicist working in Germany, the results of Zhao Zhongyao into question, although it turned out the results of Zhao Zhongyao is completely accurate, the error is the question scientists, but it affected the results of Zhao Zhongyao be further confirmation. In 1936, in recognition of the discovery of the positron important achievement, the Royal Swedish Academy of Sciences awarded the Nobel Prize in Physics in 1932, observed in cloud chamber tracks positron Anderson, rather than being first discovered in 1930 Zhao Zhongyao negative electron annihilation. (Anderson also admitted that when his students Zhao Zhongyao experimental results came out, he was next door to the office Zhao Zhongyao, when he realized that Zhao Zhongyao experimental results have shown that people not know that there is a new material, his research is inspired by Zhao Zhongyao was doing.) Of course, later, as the discoverer of the positron is rectification of names (in Zhaolao year before his death, and finally to comfort the people of the world and Zhaolao Spirits of heroes.) Discovery of the electron pair production and annihilation of electron so that people's understanding of elementary particles has undergone major changes,
Vibram 5 Finger Shoe, people have to rethink what is the problem of elementary particles. Originally elementary particles of matter means that these particles are the most basic, the unit can not be divided, as electronics such elementary particles can neither produced nor destroyed. But now finds the right conditions,
Vibram Five Fingers Speed, the positive and negative electrons can generate or annihilate in pairs, that can be transformed into each other. Material changes in various forms with each other, which is no doubt in understanding is a huge leap forward. In this and later found more anti-particles, and thus more facts repeatedly confirmed this law. In 1936, Anderson received the discovery of the positron and the Nobel Prize in Physics, at the age of 31 years. Atlas Atlas entry for more reference materials 1
positron
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Further reading: 1
Zhao Zhongyao observed in the cloud chamber trajectory of the positron, then called the next Anderson colleagues observed
2
http://aimit.blog.edu.cn/2009/229795.html Open Category: universe, science, astronomy, physics, micro
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