- #1

cemtu

- 99

- 7

- TL;DR Summary
- When electron-positron pair is created their KE is not necessarily shared equally, for example, if the energy of the incoming gamma ray is 1022 keV the pair of positron and electron does not have to be 511 keV each; one can be 501 keV while the other can have 521 keV. Why is that?

We know that when a high energy gamma ray(E >= 1022 keV because the total energy of 1 electron at rest and 1 positron at rest is 511 keV) passes near a high Z(atomic weight) atomic nucleus interacts with the electrical field of the nucleus and there is a probability that this high energetic gamma-ray will create positron and electron pairs in order to conserve the linear momentum.

However, when the total energy of the incoming gamma ray is bigger than 1022 keV, this pair is created their total energy is not necessarily shared equally, there can be a difference in the KE shared by the electron-positron pair. For example, if the total energy of the incoming gamma ray is 1044 keV the pair of positron and electron does not have to be 522 keV each; one can be 523 keV while the other can have 521 keV. Why is that?

What does determine which particle will have which value for total energy for pair of electron and positron?

(Any remaining energy of more than 1022 keV will be given to each particle of pair as KE.)

My source(free): https://www.nrc.gov/docs/ML1122/ML11229A667.pdf (62th page of 110)

However, when the total energy of the incoming gamma ray is bigger than 1022 keV, this pair is created their total energy is not necessarily shared equally, there can be a difference in the KE shared by the electron-positron pair. For example, if the total energy of the incoming gamma ray is 1044 keV the pair of positron and electron does not have to be 522 keV each; one can be 523 keV while the other can have 521 keV. Why is that?

What does determine which particle will have which value for total energy for pair of electron and positron?

(Any remaining energy of more than 1022 keV will be given to each particle of pair as KE.)

My source(free): https://www.nrc.gov/docs/ML1122/ML11229A667.pdf (62th page of 110)

Last edited: