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Can annihilation of matter occur between a positron and neutron?
Wiki User
∙ 14y ago
No, a positron cannot react with a neutron in any kind of annihilation reaction. An electron and a positron can, and the same with a neutron and an anti-neutron, but it does not occur between a positron and a neutron.
Wiki User
∙ 14y ago
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Describe what happens when a position and a electron collide?
The collision of a positron and an electron is either a scattering event or a mutual annihilation event. Remember that the positron is antimatter; it's the antiparticle of the electron. It has a positive charge and will be attracted to electrons (or anything else negative). If a positron has extremely high energy, it will have to "slow down" before it and an electron can "mutually capture" each other and annihilate each other. Let's look at a positron with high kinetic energy that is moving very quickly through some medium like air or water. In scattering, the positron whizzes by an electron of an atom and some energy is exchanged. The positron will give a bit of energy to the electron, and how much will be determined by the energies of the positron and the electron, and some "probabilities" regarding the scattering, which could be either inelastic or elastic scattering. The net result is that the positron will leave the area moving a bit less rapidly. It lost energy (has less kinetic energy), and it is slowing down. As it slows, it experiences an increasing probability that it will be able to combine with an electron. The more it slows down, the more likely the "combining event" will become. When the positron "bumps into" an electron after slowing down, that positron and the electron will "combine" themselves, and all of their mass will be converted into energy. This energy will be carried off by a pair of electromagnetic rays, two gamma rays. And they'll have considerable energy and be moving in opposite directions. Conservation laws will have been upheld in the reaction. The combination of matter and antimatter results in mutual annihilation, and the two particles completely disappear, having had all of their mass converted into energy.
A nuclear particle with no charge?
Atomic particles with no charge are neutrons, and neutrinos.
What is a single point where all matter from an extremely massive neutron star has condensed and from which no light can escape?
Black hole
What is the state of matter that expands the least when heated?
The least compressible state of matter is a solid. But even solids may be compressed slightly.A Neutron Star consists of matter so compressed that it is now composed only of neutrons.And of course, in a Black Hole, things are more compressed again.But both neutron Star and Black Hole are degenerate matter - they are no longer considered ordinary matter.
What contains the densest material in the universe?
as neutrons have heaviest mass in an atom,and also neutrons are major constituents of neutron stars.so neutron stars ae most densest in the universe
What is an annihilation reaction?
Annihilation reaction is when you take matter and anti-matter and try to put them together and they cancel each other out. Try putting an electron and a positron together. What happens? They will cancel each other out.
What is the difference between a positron and an electron?
An electron is the carrier of the negative electrostatic force, and it has a charge of -1. Also, the electron, along with the proton and neutron, are the "basic building blocks" of atoms, and they make up the matter all around us. The positron, on the other hand, is an anti-electron - it's antimatter! And it is the antiparticle of the electron. It has a charge of +1, which is just the opposite of the electron's. The fact that the electron and positron are matter and anti-matter, and that they have a charge of -1 and +1 respectively are the major differences. A positron is an electron's anti-particle, and when the electron and positron come in contact with each other to combine, they annihilate each other in a process called electron-positron annihilation. There is a link below to that related question and to a couple of others.
Why do antimatter and matter react when they touch what's the chemistry of it?
Matter-Antimatter reactions are not chemical reactions. They are very complex sub-atomic reactions, and the nature of the annihilation depends on the matter and anti-matter in the reaction.One of the simplest matter-antimatter annihilations is between an electron and a positron (an anti-electron). The electron has a negative charge and the positron has a positivecharge. When they come in to contact (under the right conditions) they must annihilate, since one cancels out the other.However matter cannot simply dissappear, so it must be converted to energy via E = mc^2 where E is the energy released, m is the combined mass of the electron and positron, and c is the speed of light.In the case of the electron-positron annihilation this results in two gamma rays of a certain energy.As the size and complexity of the matter-antimatter reactions increases so does the complexity of the reactions.
What the difference between positive and negative electrons?
an electron always has a negative chargea positron is identical in all respects to an electron (sometimes it is called a "positive electron"), except it always has a positive charge and is antimatter (not matter)If an electron and a positron meet they will both cease to exist (annihilation) and gamma ray photons will be created.
What would happen if a positron met an electron?
When a positron meets an electron, they annihilate or destroy each other.This phenomena is known as annihilation of matter. During this process two photons of gamma rays are produced that travel in opposite directions.Actually the mass of electron and positron has been converted into energy (gamma rays).
How much does one gram of antimatter?
Anti matter does NOT exist. As soon as it is in contact with matter which is anything ; solid , liquid , gas, they are both annihilated. You can think of antimatter as protons with a negative charge and electrons with as positive charge. So Proton^+ Proton^- = Annihilation (??? Energy) Electron ^- + electron^+(positron) = Annihilation (???? Energy).
Does an electron-positron collision violate the law of conservation of matter?
No, electron-positron collision does not violate the law of the conservation of matter. Momentum and charge are also conserved. Electrons and positrons can collide in what are called scattering events, and they can do this without necessarily undergoing mutual annihilation. Because both these little critters can exist as a wave (particle-wave duality), their behavior can be fairly easily assessed using a "basic tool kit" to analyze electromagnetic wave interaction. But electrons and positrons can annihilate each other rather than scatter. Annihilation doesn't violate the law of conservation of matter, either. And there's a reason for that. The "old" idea of the conservation of matter was that matter could neither be created nor destroyed. But we now know that matter can be converted into energy. That's what happens in annihilation. The article in Wikipedia on the annihilation event touches on electron-positron collision. And there is an article on electromagnetic scattering as well. They aren't that difficult to understand, and the curious person will find links to those posts below.
Why doesn't electrons get destroyed?
They are destroyed in "K capture" decay when a proton in the nucleus captures an electron, becoming a neutron.They are destroyed in matter-antimatter annihilation when they meet a positron, a gamma ray photon is emitted.
What is the anti-matter equivalent of an electron?
No. The antiparticle for the proton is called antiproton. The antiparticle for the electron is called antielectron, also known as positron.
Why do you get photons or other particles in annihilation of subatomic particles?
In annihilation between electron and positron, you should get nothing in your hand. Instead of that you get a pair of photons. The question is that why should you get the pair of photons. So this is not complete annihilation. The answer is simple to this question. When you bring the electron and positron slowly to each other, they will annihilate to each other and will not produce the photons also. But when the particles come with high speed, they carry the energy and have momentum. This energy is converted into photons of different wave length and the electron and positron disappear or get completely annihilated. When you have heavy particles like protons and anti-protons or neutrons and anti-neutrons strike to each other, you get much larger amount of energy that is left. Because they are brought to each other at high speed, they have high momentum and so carry the large amount of energy. This energy is liberated after the annihilation. When enough quantum of energy is there, you have production of electrons, positrons and neutrinos get generated. The rest of the energy is left in the form of photons. When larger molecules of matter and antimatter will collide with each other, you may get smaller molecules of matter and antimatter in your hand.
Does annihilation of anti matter release any photons?
The resulting photon release would vary depending on method of annihilation and/or if said anti matter was in concurrence, at that time, with matter.
What is the flaw in the definition of annihilation by Google?
The definition given by Google fallows. "The conversion of matter into energy, especially the mutual conversion of a particle and an antiparticle into electromagnetic radiation." Now to evaluate the example of electron and positron annihilation. You get two gamma rays as electron and positron annihilation occurs. (1)Gamma ray is a photon travelling at the speed of light.That is photon* C.So photon* C = Gamma ray. (2)The mass of electron = mass of positron. (3)Speed of light is ---- C = 300000000 m/s. (4)Now as per the equation of Einstein.E = m* C square.That is E =(m * C * C.)So 2 E = 2 (m*C*C).By putting the gamma rays and mass of electron or positron into the equation you get2 gamma rays = 2 ( mass of electron* C * C)..... From (1).By putting the value of gamma ray (2) into the equation you get2 (photon * C) = 2 ( mass of electron * C * C )Divide the equation by 2. You getPhoton * C = mass of electron * C * C.Divide the equation by C. You getphoton = mass of electron * C.That isphoton = mass of electron * 300,000,000.This means the photon is as massive as 300,000,000 times one electron.But this is not possible. As the mass of photon is said to be zero.That meas the definition is incorrect. Here the matter is not converted into energy. Here the mass disappears into nothing.From the electron you get gamma ray.From the positron you will logically get one anti- gamma ray.Both gamma ray and anti-gamma rays will annihilate each other into nothing.Hence proved.( So inversely you can get a pair of electron and positron from nothing. Likewise you get proton and anti-proton annihilation into nothing. Here you get equal number of electrons and positrons. Which can eventually disappear into nothing. Likewise neutron and anti-neutron disappear into nothing. So equal quantity of matter and anti-matter disappear into nothing.Vise versa, from nothing, you get equal quantity of matter and anti-matter. There is no limit to the 'time' and 'space'. So there is no limit to the amount of matter and anti-matter that is present in the space at any given time. You have the universe present of matter. That means you have a universe present of anti-matter.The equation of gravity between matter and anti-matter fallows.Force of gravity is proportional to the product of masses and inversely proportional to the square of distance between them. F is proportional to M* minus M / distance square. This equation has got minus value. So force of gravity is negative. That means mater and anti-matter will repel each other. That means the universe of matter and anti-matter will repel each other. Obviously the universe of anti-matter can not be located by today's telescopes. It is lost in the space. But the presence of universe of anti-matter is derived mathematically. There may be end number of universes of matter and anti-matter, that are present in this infinite space. But at any given time the amount of matter and anti-matter is same. Together it's zero.Hence proved.)
