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opticsguy
sage


Reged: 02/02/09

Loc: Washington State
new project, - understanding sub-atomic particles
      #5796306 - 04/13/13 10:12 AM

My brain is too small to get a clear understanding of the complexities of sub atomic particles and my project is wanting to make up a spread sheet listing all the known sub atomic particles, organized into groups, sub groups, etc.

My "spread sheet" would be a very large piece of paper that I can draw on, move things around and possibly make connections of forces etc.

Any recommended web sites that has already done this?

Thank you


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JKoelman
professor emeritus


Reged: 05/16/11

Loc: Bangalore, India
Re: new project, - understanding sub-atomic particles new [Re: opticsguy]
      #5796712 - 04/13/13 02:29 PM

You might find this site useful.

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deSitter
Still in Old School


Reged: 12/09/04

Re: new project, - understanding sub-atomic particles new [Re: JKoelman]
      #5797277 - 04/13/13 06:19 PM

This sounds like fun. Rather than simply consult a catalog, I would suggest looking over the history of atomism from Democritus to now. You will meet many interesting characters along the way. Dalton will meet you at the front door. Maxwell will take your coat. Boltzmann will have a sherry with you. You'll meet Rutherford, Chadwick, and they will introduce you to Dirac and Einstein. There's a gnome named Gell-Mann, but he doesn't bite that hard. Weinberg and Glashow will entertain you. Did I mention that Mendeleev will be there? And then there's Fowler and Hoyle. Finally a curtain will be drawn back to reveal Pauli, the Mephistopheles behind all. Have fun.

-drl


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opticsguy
sage


Reged: 02/02/09

Loc: Washington State
Re: new project, - understanding sub-atomic particles new [Re: deSitter]
      #5801836 - 04/16/13 12:39 AM

This is too complicated!!! Nuetrinos are left handed?

Time is quantized? There was no Big Bang, just a before and after??


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Rick Woods
Postmaster
*****

Reged: 01/27/05

Loc: Inner Solar System
Re: new project, - understanding sub-atomic particles new [Re: opticsguy]
      #5801917 - 04/16/13 02:16 AM

I'd be happy just to figure out where I left my keys.

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buddyjesus
Carpal Tunnel
*****

Reged: 07/07/10

Loc: Davison, Michigan
Re: new project, - understanding sub-atomic particles new [Re: Rick Woods]
      #5802005 - 04/16/13 05:18 AM

learn something every day.

Can someone explain why a meson can be formed by matter and antimatter combined without annihilation?


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deSitter
Still in Old School


Reged: 12/09/04

Re: new project, - understanding sub-atomic particles new [Re: buddyjesus]
      #5802028 - 04/16/13 06:07 AM

BuddyJ,

They do in fact annihilate when the pairs involved are conjugate. If you consult this table you will see that mesons made from conjugate quark-antiquark pairs, like the pi_0 and the eta, have very short lifetimes compared to the ones made from dissimilar pairs like the pi_+. An "up" quark can only annihilate with an "up" anti-quark. So the up-anti-down pair is relatively stable.

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

It is also possible also to make a bound state from a positron and an electron. This material, "positronium", is short-lived, but has been confirmed to exist.

-drl


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buddyjesus
Carpal Tunnel
*****

Reged: 07/07/10

Loc: Davison, Michigan
Re: new project, - understanding sub-atomic particles new [Re: deSitter]
      #5802693 - 04/16/13 01:31 PM

k thanks for the clarification. that is what I thought but wanted to verify!

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