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' atomic number goes down by one because there is now one less proton in there, the atom becomes boron-11. Your positron and a gamma ray (0.966 MeV) will be "fleeing the scene" in the pair production event. Oh, and let's not forget that since the nucleus has one less proton in it, one of the electrons around that nucleus will no longer be "held" in place and will wander off. There is a more detailed explanation in the answer to this question: When an element undergoes positron decay what happens as the new element forms? You can find a link to it below.
The beta plus decay of mercury (a positron emission event) will deliver the daughter nucleus gold.
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 and the positron produced is ejected from the nucleus along with a neutrino. This tranforms the atom from one element into another element because the proton count has gone down by one. Use the links below to learn more.
NUCLEUS.Atomic energy is produced from changes within nucleus of an atom.
The electron is the sub-atomic particle that orbits the nucleus of an atom of matter. For anti-matter the sub-atomic particle that orbits the nucleus is the anti-electron (positron).
This is the atomic nucleus.
The atomic number decreases by 1, but the mass number remains the same.
No, whenever an atom emits a positron its atomic number is decreases by one unit (because a proton is converted into a neutron and a positron) but atomic mass remains the same so phosphorus is converted into silicon atom with same atomic mass.
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 a "regular" atom. Positrons can be produced in atomic nuclei by some kinds of radioactive decay, and they can be observed to be leaving a nuclear reaction called beta plus decay. But the positron leaves the nucleus of an atom as soon as it is created. It does not (cannot) exist in the nucleus of an atom.
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 proton than it did before, its atomic number just went up by one; it is another element.
When the atomic number increases by one there is either 'beta decay' or the nucleus has captured a positron.
There are no positrons in an atom. A positron is an anti-electron - it's antimatter. It will combine with an electron when it can (pretty much as soon as it can) in mutual annihilation. Both it (the positron) and the electron will have their entire mass converted into energy. In translation, that means a positron (antimatter) will not survive in a "regular" matter universe. It won't exist here with us for very long. But the positron can appear here at any time. Let's look at that. A positron can be created in a nuclear (radioactive) decay event. This is beta plus decay, and is addressed in the question about what beta decay is. In short, a proton is converted into a neutron in the nucleus of an atom and a positron is produced and kicked out of that nucleus. It did not exist in there before the event. Links to what beta decay is and other related posts can be found below. A positron could also be created when a high energy gamma ray passes close to an atomic nucleus. This is called pair production. A question exists here that speaks to that and it is linked below. In an antimatter universe, the positron would be in the positron cloud that forms about the nucleus of an antimatter atom. That nucleus would hold the anti-protons and the anti-neutrons.
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 identity, is determined solely by the number of protons in the nucleus. If we "lose" a proton because it changes into a neutron, atomic number will now decrease by one. Check out the links below to related posts.
Decay of an unstable atomic nucleus.
When an atomic nucleus releases a positron, it has undergone beta plus decay. This nuclear transformation event also will release a neutrino. Use the link below for more information.
In alpha decay, the nucleus loses two protons and two neutrons, emitting them as an alpha particle (essentially, a helium nucleus). The atomic number therefore decreases by 2. In ordinary beta decay, a neutron in the nucleus decays into a proton (which remains in the nucleus), an electron (which is emitted and sometimes called a beta particle) and an antineutrino. The atomic number therefore increases by 1. There is another type of beta decay, called beta-plus (β+) decay or positron emission, in which a proton transforms into a neutron, emitting a positron (the antiparticle of the electron) and an neutrino. In this type of decay the atomic number decreases by 1.
After positron emission or electron capture the atomic number is decreased with one.
what is the atomic number of the nucleus?
The atomic number is equal to the number of the protons in the atomic nucleus.
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.
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 in a number of different decay schemes. These decay modes include spontaneous fission, beta decay and alpha decay. As regards a nucleus emitting an electron or positron, these are the two forms of what is called beta decay. A question (with a pretty good answer) can be found by using the link below to the related question, "What is beta decay?"
The minium required energy of a photon that is involved in the creation of an electron-positron pair (which is pair production), is 1.022 MeV.An electron-positron pair has a given probability of being produced when a photon of the stated energy (or a higher energy) passes close the nucleus of an atom. Pair production does not happen "in the presence of a photon" but happens as a direct result of the the actual presence of a photon (having at least the stated energy) in the presence of an atomic nucleus. The presence of an atomic nucleus is necessary to insure conservation of the quantum mechanical characteristics of the event. Said another way, the high energy photon alone cannot spontaneously create the electron-positron pair in pair production. A link can be found below to related questions.
Emitting a positron, turns a proton into a neutron. So the atomic number goes down by 1, while the mass number remains the same.
The atomic number gives the number of protons in the atomic nucleus.
The atomic number is the number of protons in a nucleus.
The atomic nucleus contain protons and neutrons.