lehpron
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What Are The Products Of An Antimatter Fussion?

Wed Sep 19, 2007 7:45 am

When an electron and positron come together, what is the outcome, what energy particles?
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IFEMaster
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RE: What Are The Products Of An Antimatter Fussion?

Wed Sep 19, 2007 8:22 am

Antimatter chopsticks. Don't cross them!:

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LTU932
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RE: What Are The Products Of An Antimatter Fussion?

Wed Sep 19, 2007 8:32 am

Do you want to build a warp drive?  Wink
 
vikkyvik
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RE: What Are The Products Of An Antimatter Fussion?

Wed Sep 19, 2007 8:32 am

As someone once put it, that question is "eminently Googleable":

http://physics.pdx.edu/~egertonr/ph311-12/pair-p&a.htm
I'm watching Jeopardy. The category is worst Madonna songs. "This one from 1987 is terrible".
 
Yellowstone
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RE: What Are The Products Of An Antimatter Fussion?

Wed Sep 19, 2007 11:36 am

matter+antimatter=photons (generally of the gamma-ray energy level)
Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
 
lehpron
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 4:11 am

So there is radiation no matter what...and here I was thinking that antimatter reactor would allow nuclear energy without radioactive waste...  Yeah sure
The meaning of life is curiosity; we were put on this planet to explore opportunities.
 
David L
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 5:58 am

Quoting Lehpron (Reply 5):
and here I was thinking that antimatter reactor would allow nuclear energy without radioactive waste...

I see you're still working on that ultra-power supply for your PC.  biggrin 
 
Arniepie
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 6:18 am

Quoting David L (Reply 6):
I see you're still working on that ultra-power supply for your PC.

Yeah, and it still won't be strong enough to run FSX without looking like a slide-show.
[edit post]
 
Klaus
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 6:38 am

Quoting David L (Reply 6):
I see you're still working on that ultra-power supply for your PC.

Too bad he'll need that ultra-long keyboard extension and a telescope for the screen...!
 
MD11Engineer
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 6:47 am

Quoting Lehpron (Reply 5):
So there is radiation no matter what...and here I was thinking that antimatter reactor would allow nuclear energy without radioactive waste... Yeah sure

In a matter-antimatter reaction, both particles convert completely into energy, which usually appears in the shape of high energy photons (gamma rays). This is actually a form of energy conversion, since mass is a form of energy as well, see E=mc^2).

Jan
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Yellowstone
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 7:59 am

Quoting MD11Engineer (Reply 9):
This is actually a form of energy conversion, since mass is a form of energy as well, see E=mc^2).

To give a sense of the energies we're talking about, the Hiroshima nuclear bomb, at 15 kilotons TNT equivalent, released about 63,000,000,000,000 (63 trillion) joules of energy. To get the same energy from a matter-antimatter annihilation, you would have to mix just .35 mg matter with .35 mg antimatter. Mixing 70 mg of each yields as much energy as the US's most powerful nuclear warhead currently in service.
Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
 
Go3Team
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 8:03 am

As I've always wondered, where can one find antimatter?
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Yellowstone
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 8:07 am

Quoting Go3Team (Reply 11):
As I've always wondered, where can one find antimatter?

High-energy particle collisions. Alternately, the decay of certain isotopes generates positrons (antielectrons).
Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
 
Klaus
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RE: What Are The Products Of An Antimatter Fussion

Thu Sep 20, 2007 8:12 am

Quoting Go3Team (Reply 11):
As I've always wondered, where can one find antimatter?

Nowhere near, fortunately!

Antimatter is only synthesized in the lab - and even there usually just particle by particle, much rarer and more difficult a few atoms made up of those particles.

The energy invested into the huge accelerators and other machinery to create them by far exceeds the energy resulting in the antimatter particles annihilating themselves on contact with regular matter...

It's barely enough to confirm some basic properties, but certainly not enough to do actual macroscopic damage.
 
Go3Team
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 9:08 am

Quoting Klaus (Reply 13):
Nowhere near, fortunately!

Well damn, I need something for my dylithium chamber project...
Yay Pudding!
 
MD11Engineer
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RE: What Are The Products Of An Antimatter Fussion

Thu Sep 20, 2007 4:20 pm

Quoting Klaus (Reply 13):
Nowhere near, fortunately!

Antimatter is only synthesized in the lab - and even there usually just particle by particle, much rarer and more difficult a few atoms made up of those particles.

The main problem is how to store the anti matter, since any contact with regular matter will result in spectacular fireworks. A recent development is a magnetic trap, in which individual antimatter ions are suspended in a magnetic field, to facilitate study.

Quoting Yellowstone (Reply 10):
To give a sense of the energies we're talking about, the Hiroshima nuclear bomb, at 15 kilotons TNT equivalent, released about 63,000,000,000,000 (63 trillion) joules of energy. To get the same energy from a matter-antimatter annihilation, you would have to mix just .35 mg matter with .35 mg antimatter. Mixing 70 mg of each yields as much energy as the US's most powerful nuclear warhead currently in service.

Don't forget that in the Hiroshima bomb maybe at maximum 5% of the nuclear fuel actually reacted before the heat blew the rest of the bomb apart and so stopped the reaction. Then, nuclear fision is using only part of the total mass to be converted into energy. Most of the total mass remains in form of fission products.

A pure matter-anti,atter reaction will leave no matter products, all mass will be converted into energy (photons). Unlike fission or fusion, there will also be no free neutrons roaming around to irradiate materials.

Jan
Je Suis Charlie et je suis Ahmet aussi
 
Klaus
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RE: What Are The Products Of An Antimatter Fussion

Thu Sep 20, 2007 5:33 pm

Quoting Go3Team (Reply 14):
Well damn, I need something for my dylithium chamber project...

When you've got your dilithium crystals already, I'm sure many physicists would be most fascinated and interested in dropping by...!

After all, controlled matter/antimatter reactions are pretty much the strongest energy source we could think of. Unfortunately the military would probably be among the first to have an "application"...  yuck 
 
Yellowstone
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RE: What Are The Products Of An Antimatter Fussion?

Thu Sep 20, 2007 11:05 pm

Quoting Klaus (Reply 16):
When you've got your dilithium crystals already, I'm sure many physicists would be most fascinated and interested in dropping by...!

Actually, a common exercise in chemistry classes when molecular orbitals are introduced is to see if dilithium can exist (i.e. if it is energetically favorable for two lithium atoms to bond). In fact, it can.
Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
 
MD11Engineer
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RE: What Are The Products Of An Antimatter Fussion?

Fri Sep 21, 2007 12:15 am

Quoting Yellowstone (Reply 17):
Quoting Klaus (Reply 16):
When you've got your dilithium crystals already, I'm sure many physicists would be most fascinated and interested in dropping by...!

Actually, a common exercise in chemistry classes when molecular orbitals are introduced is to see if dilithium can exist (i.e. if it is energetically favorable for two lithium atoms to bond). In fact, it can.

Sure, you are filling up the 2s orbitals, which become energetically stable if they are occupied by two electrons.
since lithium has 3 electrons, the 1s orbital is fully occupied, while the 2s orbital only contains one electron. To become energetically stable, it needs another electron. This is why it reacts as a alkaline metal. Lithium is very willing to bond with any other element, which can donate another electron, e.g. oxygen or any halogene element.
Lithium is, at room temperature, a metallic solid with a cristalline structure. In this form all the 1s electrons will migrate through the whole cristall as an electron gas and thus stabilise he individual atoms. In gas form I could imagine lithium to form two atom molecules, just like hydrogen, the only caveat would be if the thermic energy at this temperature would exceed the bonding energy between the two atoms.

Jan
Je Suis Charlie et je suis Ahmet aussi
 
lehpron
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RE: What Are The Products Of An Antimatter Fussion?

Sat Sep 22, 2007 6:14 am

Quoting David L (Reply 6):
I see you're still working on that ultra-power supply for your PC.

I will concede that that was humorous. Big grin

Quoting MD11Engineer (Reply 9):
In a matter-antimatter reaction, both particles convert completely into energy, which usually appears in the shape of high energy photons (gamma rays).



Quoting MD11Engineer (Reply 15):
A pure matter-anti,atter reaction will leave no matter products, all mass will be converted into energy (photons). Unlike fission or fusion, there will also be no free neutrons roaming around to irradiate materials.

It was my understanding that gamma rays can kill us, but if lack of free nuetrons means no irradiated materials; could land decimated by an antimatter bomb be rebuilt upon in a decent amount of time, unlike with a regular nuke, waiting thousands of years? Or we simply do not have the understanding to even guess at those conclusions?
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