0
Positron annihilation spectroscopy is a research tool that is being investigated because it may provide a way to look at defects in a solid matrix.
A positron source is set up to direct positrons at a material under investigation. Because of the way positrons behave while slowing down (they usually don't just combine with the first electron they encounter), they tend to find their way into defects in the material structure of the solid into which they have been directed. When the positron does finally hook up with an electron and the annihilation event occurs, the energy and directivity of the gamma rays produced can be used to learn something about the structure of the atomic matrix in which the event occurred.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What radiation is given off when a positron collides with an electron?
When electron-positron annihilation occurs, we see a pairof gamma rays produced. The radiation is roughly, f = 2 (me) c2/ h = 2 x .9-30 x 916 x 1.533 = 2.4320 = 243 exaHertz. Use the link below to the related question for some discussion on electron-positron annihilation.
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 kind of decay that occurs when a nucleus releases a positron?
There is technically no such thing as positron decay. It's a misnomer. The nuclear decay process wherein a positron is emitted from a decaying nucleus is called positron emission or beta plus decay. A link is provided below that question and its answer.
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).
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.
Can annihilation of matter occur between a positron and neutron?
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.
What has the author Andrew Peter Brown written?
Andrew Peter Brown has written: 'Positron annihilation at metal surfaces'
What radiation is given off when a positron collides with an electron?
When electron-positron annihilation occurs, we see a pairof gamma rays produced. The radiation is roughly, f = 2 (me) c2/ h = 2 x .9-30 x 916 x 1.533 = 2.4320 = 243 exaHertz. Use the link below to the related question for some discussion on electron-positron annihilation.
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 kind of decay that occurs when a nucleus releases a positron?
There is technically no such thing as positron decay. It's a misnomer. The nuclear decay process wherein a positron is emitted from a decaying nucleus is called positron emission or beta plus decay. A link is provided below that question and its answer.
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).
If a photon is the product of the Dirac annihilation energy of a virtual electron-positron pair how is the energy dispersed?
In mutual annihilation, a positron and an electron combine. and the masses of both particles are entirely converted into energy. The energy is divided between not one but two gamma rays, each moving in the opposite direction. Only the two photons are produced in this phenomenon, and all quantum mechanical characteristics must be conserved. Additionally, the use of the term "virtual" to describe the electron-positron pair is probably something that might be avoided.We might note that the mutual distruction of an electron-positron pair is called mutual annihilation by physics types. A separate question (and its answer) exist. There is a bit more to this as regards the aspects of conservation, but the essential ideas are all contained here. Use the links below for more information.
What has the author G M Hood written?
G. M. Hood has written: 'The temperature dependence of positron annihilation in a-Hf' -- subject(s): Photochemistry, Titanium, Physics, Zirconium
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).
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.
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 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.
