Why do positron emission and electron capture have the same effect on a nucleus?

already exists.

Would you like to merge this question into it?

already exists as an alternate of this question.

Would you like to make it the primary and merge this question into it?

exists and is an alternate of .

The reason positron emission and electron capture have the same effect on the nucleus of an atom is because the resulting atom undergoes nuclear transformation, and the new element will have one less proton and one more neutron than the precursor element. Both of these nuclear changes are interesting, so let's look a bit more closely.

In positron emission (also called beta plus decay), a proton in the nucleus of an atom "changes" into a neutron and a positron is ejected. This results in one less proton in that nucleus (naturally), and the creation of a new element. And because the proton had become a neutron, the nucleus has the same number of nucleons and a similar atomic weight.

In electron capture, a nucleus with "too many" protons will actually "pull in" an electron and take it into its nucleus. This electron will "combine" with a proton, and a neutron will result. This will reduce the number of protons in the nucleus, and the creation of a new element -- just like in positron emission. Links to related questions can be found below.
3 people found this useful

How far will an electron-positron pair travel in a lead shield if the incident photon is 5 MeV and the pair both have the same energy?

Answer . If the question can be imagined and framed properly, it can be asked, even if it has no "real world" applications. But let's get real with this one. The answer is "not very far" into the lead shield. A sheet of aluminum foil would stop the pair of particles. We've got problems with this (MORE)

How is an atomic nucleus affected when a positron is produced?

Quite simply, the affected atomic nucleus would undergo a "change" from one element to another element. The question refers to so-called beta+ decay, or positron emission, as lots of folks call it. In the case of carbon-11, a proton in the nucleus changes into a neutron, and, because the nucleus' at (MORE)

The process of positron emission results in a change to the atomic nucleus. Is that change a decrease of 1 or a decrease of 2 or an increase of 1 or is there no change?

In positron emission, atomic number decreases by one . That's because a proton in the nucleus of the element that is about to undergo positron emission changes into a neutron. This is beta plus decay, by the way. You'll recall that the atomic number of an element, which is that element's chemical i (MORE)

What happens when a positron and an 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 extreme (MORE)

Positron emission tomogrophy?

This isn't really a question, but here we go... PET technology is used in PET scans in hospitals. It is the largest scale use of antimatter currently available, as the emitted positrons are in fact the anti-particles of electrons. Therefore used improperly it can be extremely dangerous as if a part (MORE)

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 antimatte (MORE)

Do the positron and electron possess the same kinetic energy after the pair production event?

Yes, the positron and electron have the same kinetic energy in pair production. Conservation of the quantum mechanical characteristics (all of them) is a must in this phenomenon, and the particles will "balance" as regards the kinetic energy they come away from the event with. Further, the atom that (MORE)

What happens to the atomic number and mass number of a nucleus when it emits an electron or a positron or a gamma ray?

Any excited atomic nucleus can emit a gamma ray. The gamma ray is a quantum of electromagnetic energy, and it really does nothing to the atomic number or the mass number of the atom. A gamma ray can also be emitted when an atomic nucleus decays, and it will appear with another particle or particles (MORE)

What happens in the positron emission of silicon-26?

Silicon-26 is a synthetic isotope of silicon; it is a man-made isotope. Additionally, silicon-26 is pretty unstable, and it has a half life of only about 2.234 seconds. This unstable isotope of silicon undergoes beta plus decay, which is also called positron emission. The result is the creation of a (MORE)

What happens to an atomic nucleus when a positron is produced?

A positron is an antielectron, and it is produced in beta plus decay when a proton in the nucleus of an atom undergoes a change and becomes a neutron. An up quark in the proton transforms into a down quark through the mediation of the weak interaction or weak force. The proton then becomes a neutron (MORE)

What is the nuclear equation for molybdenum-91 undergoing positron emission?

If molybdenum-91 undergoes beta plus decay, or positron emission, the equation will look like this:. 42 91 Mo => 41 91 Nb + e + + v e . In this reaction, a proton in the nucleus of the Mo-91 atom undergoes a change mediated by the weak interaction or weak force. This involves an up quark ch (MORE)

What is positron emission?

Positron emission occurs in a type of radioactive decay called beta plus decay. In this event, a proton in the nucleus of an atom undergoes a transformation and becomes a neutron. One of the up quarks of the proton becomes a down quark in this event, and a neutron appears where there was a proton. T (MORE)

What happens when a positron reacts with an electron?

A positron is an anti-electron, and it's antimatter. When a positron "gets together" with an electron, the two particles undergo what is called mutual annihilation . In electron-positron annihilation, all of the mass of both particles is converted into energy, and two high energy gamma rays w (MORE)

How does positron emission cause nuclear transmutation?

It is in beta plus decay that we see the positron emitted from the nucleus. (An electron is emitted in beta minus decay.) Within the nucleus of an unstable atom, a proton transforms into a neutron, and a positron is ejected from the nucleus (along with a neutrino). As the nucleus now has one more pr (MORE)

Why don't positrons annihilate the electrons in the same atom when they're released?

The positron released from an atomic nucleus in positron emission (or beta plus decay) appears with high kinetic energy. It's moving very quickly, and because it is, it has an extremely low probability of actually interacting with that atom's electrons in mutual annihilation. That positron will unde (MORE)

Is there a positron in the nucleus of an atom?

There are no positrons in the nucleus of any atom. Positrons are anti-electrons; they are antimatter. They could be said to be the antimatter equivalent of the electron, and, as such, they would be present around the nucleus of an antimatter atom as the electrons are present around the nucleus of (MORE)

Disadvantages of positron emission tomography imaging technique?

My wife has a large arterial malformation on the left side of her brain. Can a arterial cat-scan show where the weakness are and or, where they have leaked?? Also, if there are more weaknesses in the malformation? Would positron emission tomography imaging, give us a clearer picture of what we are d (MORE)

What is positron capture?

The decay of an unstable atom by absorbing a wandering positron into the nucleus, converting a neutron into a proton. One example is how a radioactive form of iodine, 131 I, can use positron capture to become xenon, 131 Xe. This is a stable, so the conversion is a big help.

How do electrons and positrons compare?

It's all quite simple. The electron is a subatomic particle carrying a negative electric charge. It has no known components or substructure, and therefore is believed to be an elementary particle.[2] An electron has a mass that is approximately 1/1836 that of the proton. The positron or antiel (MORE)

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 (MORE)

What radionuclide decays to Br-73 by positron emission?

Work backwards. Positron emission means (essentially) a proton decayed into a neutron/positron pair. The mass number remains the same, but the atomic number goes down one to Bromine. Krypton has an isotope that fits this bill.

What is the difference between a positron and electron and a nutrino?

A positron is like an electron in every way but charge, electrons having -1, positrons having +1. In other words, they're a positron is an electron's antiparticle. Neutrinos are chargeless, pointlike, nearly massless particles associated with electron and positron decays that exist in order to prese (MORE)

Positron and electron have opposite directions?

Not necessarily. They always have opposite electric charges, but you can certainly shoot them both in the same direction through a tube. If they then encounter a magnetic field in the tube, it's true that then they'll curve in opposite directions.

What is the difference between positron emission and electron capture?

In one of them a positron is emitted. In the other an electron is captured. Since positrons are the antiparticles of electrons, it can be difficult in some cases to sort out which of these has actually occurred. Given the preponderance of electrons in normal matter, either way the net effect is goi (MORE)

Why is a neutrino released during positron emission?

To preserve the conservation of; energy, momentum, and angular momentum in beta plus decay. Without the neutrino there is a measurable difference between the energy, momentum, and angular momentum of the initial and final particle. The neutrino rectifies this difference and it's existence was actual (MORE)

Why are protons converted into neutrons during positron emission?

Protons are converted into neutrons during positron emission to satisfy certain conservation laws, like charge and baryon number. The following reaction takes place during positron emission: p + --> n + e + + v e , where p + is a proton, n is a neutron, e + is a positron (antielectron), an (MORE)

How does positron emission tomography work?

A tracer courses through the bloodstream to the target organ, where it emits positrons. The positively charged positrons collide with negatively charged electrons, producing gamma rays.

What is involved in positron emission tomography?

radioactive glucose, a sugar, is injected into the body. The glucose travels to metabolically active sites, including cancerous regions that require large amounts of glucose. The PET scan detects the radioactivity

Positron emission from silicon-26?

You can't detect a positron aka, anti-electron. You have to prove super-symmetry first which will include String theory, otherwise know as M-theory. ( membrane theory) Edit : I'm not answering the question, but I am questioning the answer. As far as I know the positron was first detected about 80 ye (MORE)

Why is a positron emmited from a nucleus?

A positron is one of the beta particles emitted from the nucleus ofa radionuclide during beta decay, mediated by the weak force; theother particle being an electron. In beta-plus decay, a protonemits a positron and becomes a neutron. The reason behind it isbecause of instability in the nucleus; the (MORE)

Why is positron emission tomography a harmful technology?

There basically is no harm because the radiation levels are so lowthat due to its half life, almost all radiation is gone before thepatient leaves the clinic. Any remaining radioactive material iseliminated by urination. A minor risk of the procedure is thatpatients may experience temporary soreness (MORE)

Why a free neutron does not decay into electron and positron?

What makes you think that it should decay precisely into an electron and a positron, rather than some other option? Anyway, in any such particle conversion, certain quantities must be conserved. Some of these conservation laws are strict (no exceptions are known to exist), some not (now and then t (MORE)