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pair production can not produce in vaccum
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∙ 13y ago
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of containing, producing, or utilizing a partial vacuum
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Why is it that sometimes when a very high energy electron hits a target material a positron and two or more electrons come out of the event?
An electron at high energy entering into a scattering event will bring all that energy with it. All that energy will have to be "dealt with" in the outcome. One way that a big chunk of it can be "handled" is almost magical. A large portion of the energy can be transformed into an electron-positron pair. This event is called pair production. We usually see it when a high energy gamma ray causes it, but it can be one of the outcomes in an energetic electron collision. The production of this pair of particles is the direct result of the conversion of energy into matter, and it will carry off a lot of the energy in the event. The minimum energy need to create the pair is 1.022 MeV. The original electron is still "in one piece" after the event, so it may look like the single electron crashed into a target and two electrons and a positron came away. It was actually the original electron and that electron-positron pair. If the original electron ionized another electron (or more) in the target material (which is possible), they will come away as well. Certainly there are a number of possible outcomes in an energetic electron scattering event, but pair production is one of the possible outcomes, depending on the energies involved and the target material.
Can pair production take place in a vacuum?
== No. In a complete vacuum with nothing there, electromagnetic energy (the gamma ray from which pair production might arise) will proceed unaffected and at the speed of light. The question asks specifically about a vacuum and suggests that there is nothing there to in any way react with the gamma ray. So the answer is that pair production will not take place in, say, the extreme vacuum of deep space where a gamma ray is passing. If we start "tinkering" with the scenario and, say, firing high energy gamma rays down an evacuated pipe through which we pass a magnetic field, pair production might then occur. But it is impossible to have a magnetic field without having the material to create it - moving charges. No moving charges, no magnetic field, no pair production. Pair production will not arise spontaneously from a gamma ray of sufficient energy to facilitate it, and this is almost certainly what the question is asking. Additional information There has been publication of research that suggests that a magnetic field can initiate pair production, but the investigation continues, and the idea of doing this "strays" from what is arguably the true intent of the question. It would have been easy to change the question, but why not leave up what is up? The idea that a magnetic field can initiate pair production is an interesting one.
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