Timeline for How is momentum conserved in pair production?
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4 events
| when toggle format | what | by | license | comment | |
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| Mar 11, 2020 at 0:50 | comment | added | JEB | pair producing $\gamma$'s like the large $Z^2$ of a heavy nucleus, but the heavy part is not important, for $\hbar\omega > 4m_ec^2$. At that threshold, pair production in the fields of atomic electrons also occurs. See: rcwww.kek.jp/research/shield/photon_r.pdf | |
| Mar 10, 2020 at 23:44 | comment | added | S. McGrew | Except that gamma ray - gamma ray interactions have a very low cross section. "Very" is an understatement. | |
| Mar 10, 2020 at 21:36 | comment | added | infinitezero | Or just another gamma ray (which might as well come from a nucleus) | |
| Mar 10, 2020 at 21:19 | history | answered | S. McGrew | CC BY-SA 4.0 |