Antimatter

[Ashish]

What is antimatter?

 

Can anyone tell me completely about antimatter.

[insane_alien]

same as normal matter but with reversed charge. reacts violently when contacting normal matter by annihilation into two or more gamma photons. thats really about it unless you want more specific examples.

[timo]

For a relatively (compared to a typical forum post) long explanation, the people on WP already put quite some effort into giving a good answer for the non-further specified question "what is X". So you'd best look up the term there and then ask further questions here (further questions on WP itself are generally not welcome except when they serve the purpose to improve the respective article).

[Ashish]

same as normal matter but with reversed charge. reacts violently when contacting normal matter by annihilation into two or more gamma photons. thats really about it unless you want more specific examples.

 

That means if ever any antimatter get in contact with an noraml matter it will annihilation into two or more gamma photons, or their are some constraints.

[YT2095]

http://www.scienceforums.net/forum/showthread.php?t=30710

 

it`s a good idea to use the Search Engine!

[Ashish]

Well thanks

so can I have a conclusion from ur answer that photon are also a particle or not

[YT2095]

no idea, it would be interesting if it Did work that way, but the other thread hasn`t got that far yet.

 

although from the little I do know about Physics, I find it hard to envisage an Anti-Photon.

[timo]

That means if ever any antimatter get in contact with an noraml matter it will annihilation into two or more gamma photons, or their are some constraints.

 

It's actually not true that they necessarily annihilate into purely photons (try that with an up-quark and an anti-down quark). Constraints come from conserved quantum numbers (most notably energy and momentum) and for practical purposes also from the probability of the interaction.

[thedarkshade]

That means if ever any antimatter get in contact with an noraml matter it will annihilation into two or more gamma photons, or their are some constraints.

That's just a physicist way of confusing you. If you have never really heard of antimatter in a more detailed way before, than the very first thing you need to know is that the contact matter-antimatter results in annihilation, the complete (100%) release of the energy stored in the forces between the atoms!

 

Like IA said, the difference of antimatter is the opposite charge compared with normal matter (electrons + and protons -). It's just a concept to refer to opposite charged matter. Perhaps antimatter is the real matter and ours is the anti one, but you can't really exactly define! It's all relative!

[ydoaPs]

Like IA said, the difference of antimatter is the opposite charge compared with normal matter (electrons + and protons -). It's just a concept to refer to opposite charged matter. Perhaps antimatter is the real matter and ours is the anti one, but you can't really exactly define! It's all relative!

It's more than just charge. There are other things like opposite spin.

[swansont]

That's just a physicist way of confusing you. If you have never really heard of antimatter in a more detailed way before, than the very first thing you need to know is that the contact matter-antimatter results in annihilation, the complete (100%) release of the energy stored in the forces between the atoms!

 

Not the forces — they are typically quite small (the electrostatic forces of positronium in its ground state only release 13.6 eV). It's the conversion of all of the mass, if you get photons out of the reaction. You can get other paricle/antiparticle pairs created as well, if you started with particles more massive than electrons.

[antimatter]

I'm sure other people have given you reasonable definitions of antimatter, but a simple definition is matter that is essentially reversed. Electrons have a positive charge, thus becoming Positrons, and Protons become negatively charged. If antimatter comes into contact with any matter at all it annihilation, because the charges cancel out.

Using antiparticle de-accellerators, scientists have actually been able to create anti-hydrogen using two antiparticles.

[Riogho]

no idea, it would be interesting if it Did work that way, but the other thread hasn`t got that far yet.

 

although from the little I do know about Physics, I find it hard to envisage an Anti-Photon.

 

That's because a photon is it's own anti-particle, just as with gluons

 

Antimatter is Matter with an identical, but opposite wave function, so that when they collide you get destructive interference.

[YT2095]

I guess that would make Sense since Charge isn`t a property of a Photon, and so it must be something Else that makes it what it is, in this case the Wave form.

 

Thanks

[Klaynos]

I guess that would make Sense since Charge isn`t a property of a Photon, and so it must be something Else that makes it what it is, in this case the Wave form.

 

Thanks

 

Neutrons and antineutrons exist, neutrons have no charge....

[antimatter]

Then what properties of Neutrons are changed?

[Daecon]

Neutrons are made of 2 downs and 1 up quark, so I would guess an anti-neutron is made of 2 anti-downs and 1 anti-up quark?

 

A down quark has a -1/3 (negative) charge, and an up quark has a +2/3 (positive) charge, so

(-1/3) & (-1/3) & (+2/3) = 0 charge for a neutron.

 

An anti-down as a +1/3 (positive) charge, and an anti-up quark has a -2/3 (negative) charge, so

(+1/3) & (+1/3) & (-2/3) = 0 charge for an anti-neutron.

 

(For reference, a proton has 2 up quarks and 1 down quark, making a total charge of +1 and an anti-proton has 2 anti-up quarks and 1 anti-down quark, making a total charge of -1.)

[Klaynos]

An antineutron has a positive magnetic moment, a neutrons is negative.

 

OK so the neutron is made up of quarks lets go smaller, neutrino and antineutrino... no charge again...

[antimatter]

So essentially it has the same behavior of a normal neutron, just the quarks are reversed?

 

If there is no charge how can it be postively magnetic?

[swansont]

Because there are quarks, which are charged and have spin. Even though the neutron has no net charge, there is a charge distribution within.

[antimatter]

Ah okay, that makes more sense.

Does a negative charge affect the neutron's behavior in anyway?

[thedarkshade]

Ah okay, that makes more sense.

Does a negative charge affect the neutron's behavior in anyway?

No it doesn't (AFAIK), neutron is simply neutral!

[iNow]

Ah okay, that makes more sense.

Does a negative charge affect the neutron's behavior in anyway?

 

 

http://en.wikipedia.org/wiki/Neutron

 

The neutron interacts through all four fundamental interactions: the electromagnetic, weak nuclear, strong nuclear and gravitational interactions.

 

Although the neutron has zero net charge, it may interact electromagnetically in two ways: first, the neutron has a magnetic moment of the same order as the proton (see neutron magnetic moment);[3] second, it is composed of electrically charged quarks. Thus, the electromagnetic interaction is primarily important to the neutron in deep inelastic scattering and in magnetic interactions.

 

The neutron experiences the weak interaction through beta decay into a proton, electron and electron antineutrino. It experiences the gravitational force as does any energetic body; however, gravity is so weak that it may be neglected in particle physics experiments.

 

The most important force to neutrons is the strong interaction. This interaction is responsible for the binding of the neutron's three quarks into a single particle. The residual strong force is responsible for the binding of neutrons and protons together into nuclei. This nuclear force plays the leading role when neutrons pass through matter. Unlike charged particles or photons, the neutron cannot lose energy by ionizing atoms. Rather, the neutron goes on its way unchecked until it makes a head-on collision with an atomic nucleus. For this reason, neutron radiation is extremely penetrating.

[antimatter]

Oh okay thanks.

So essentially all the particles behave the same way?

[Riogho]

Not just charge, is opposite, but lepton and baryon numbers are also opposite for anti-matter.

 

Pi-0 are also their own antiparticle.