Matter/antimatter collisons between "unlike" particles?

  • #1
10
1
Just about everything I have read about antimatter talks about proton/antiproton, electron/antielectron, and neutron/antineutron annihilation.

But what happens if, for example, a proton and an antineutron collide? Would a weird nucleus be created or would there be a partial annihilation with some leftover quarks and antiquarks? Other outcomes? It is easy to imagine a simple process where the antineutron in a short-lived nucleus undergoes beta decay and the resulting antiproton annihilates the proton ... but does that HAVE to happen?
 

Answers and Replies

  • #2
35,437
11,856
This question gets asked frequently, and you should find various threads discussing it with the search function.

A proton and an antineutron would annihilate very similar to proton plus antiproton or neutron plus antineutron: They produce a few pions. Due to charge conservation, the symmetric annihilation produces as many positive as negative pions, while proton plus antineutron produces one positive pion more than negative pions.

Other combinations can lead to other results, or even no annihilation (e.g. antiprotons and electrons: they just repel each other electromagnetically, nothing else happens).
 
  • #3
10
1
This question gets asked frequently, and you should find various threads discussing it with the search function.

A proton and an antineutron would annihilate very similar to proton plus antiproton or neutron plus antineutron: They produce a few pions. Due to charge conservation, the symmetric annihilation produces as many positive as negative pions, while proton plus antineutron produces one positive pion more than negative pions.

Other combinations can lead to other results, or even no annihilation (e.g. antiprotons and electrons: they just repel each other electromagnetically, nothing else happens).
 
  • #4
10
1
Thanks for your reply. I finally have a day off to read up more on this and this time my search found those pre-existing threads on this topic ... no idea I could have bungled the search I did last week before starting this new thread. Maybe I'll get lucky and a moderator will just delete this thread?
 
  • #5
35,437
11,856
Just let it stay as it is.
 

Related Threads on Matter/antimatter collisons between "unlike" particles?

  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
22
Views
6K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
7
Views
3K
Replies
3
Views
2K
Top