# Matter/Antimatter annhialation

1. Jan 4, 2010

### trini

i have a question, if i took matter and antimatter of differing quantities, so for example, i took a carbon atom made up of matter and a boron atom made of antimatter, when they annhialate, would i be left with a hydrogen atom made of matter plus energy?

2. Jan 5, 2010

### Staff: Mentor

With that much energy released you probably would not wind with an atom at all, but yes, in the end there would be some matter left over and a lot of energy, assuming complete annihilation of the antimatter.

3. Jan 5, 2010

### Bob S

The only stable hadron (in isolation) is a proton. Hadron number is conserved (as far as we know). With carbon-12 and anti-boron-11, assuming complete annihilation, you will have one proton and one electron left, after the dust settles. With carbon-12 and anti-boron-10, two protons and two electrons, with a very small probability of one deuteron.
Bob S

4. Jan 5, 2010

Staff Emeritus
No it's not. $\rho \rightarrow \pi \pi$. One goes in, two go out.

5. Jan 5, 2010

### matt_crouch

just out of interest if matter can be converted to energy can energy be converted to matter. I was asked this and i think the answer is yes but i cant think of a situation where it would happen

6. Jan 5, 2010

### fahim_naruto

will the remaining matter absorb the energy?

7. Jan 5, 2010

### Bob S

Sorry- I meant baryon number is conserved. The only stable hadron (in isolation) is a proton.
bob s

8. Jan 5, 2010

### Bob S

Fermilab is creating protons and antiprotons at the rate of ~3 x 1011 from energy per hour. See left panel in
http://www-bd.fnal.gov/notifyservlet/www?project=outside
Right now, Fermilab is creating about 28 milliamps (circulating current) of antiprotons per hour.
Bob S