E865: AN ELEMENTARY PARTICLE PHYSICS 
EXPERIMENT, DONE AT BROOKHAVEN NATIONAL 
LABORATORY, USA

To learn more about elementary particle physics, check the 
poster in the exploratorium.

To learn more about the elementary particle physics of 
E865, look at the "symmetry" folder in this demonstration.

To learn more about  E865 and how  its detectors work 
together to detect the particles studied, see  one of  the 
student writeups (Andrew Willis, high school student, 
Anne Smith or Melinda Nickelson, undergraduates when 
they wrote their papers, now graduate students), or the 
E865 folder.

To learn more about Cerenkov radiation see the Cerenkov 
folder.  

TO LEARN MORE ABOUT HOW RAYS OF LIGHT 
REFLECT FROM THE E865 CERENKOV COUNTER 
MIRRORS,  LOOK AT THE MIRRORS AND TRY IT 
YOURSELF.  REMEMBER, 

ANGLE OF INCIDENCE = ANGLE OF REFLECTION!

          Have fun, and thanks for sharing our mirrors, but.

          DON'T TOUCH THE MIRROR SURFACES!!!!!



WHAT GOOD IS E865 OR   ELEMENTARY PARTICLE 
PHYSICS?

  Nothing obvious at the moment. but then, what was it 
Faraday said when people asked him what good were the 
principles of electromagnetism he was discovering?
"What good is a baby?"  Well, we don't expect that E865 
will be as important as electromagnetism (after all, we 
already 	HAVE  radios, computers, and TV's).  But  who 
knows?  Already we  elementary particle and nuclear 
accelerators  are killing  some kinds of cancer cells.  

But elementary particle  physics is already  important to 
you for the tools it has developed.


Some uses of particle physics technology:

   1. The world wide web:  it was developed by some      
elementary particle physicists who wanted to share their 
data.  Aren't you glad?
  
   2. Medical imaging:  much of it rests on the idea of 
SCATTERING which is at the basis of the way elementary 
particle physicists try to understand the properties of these 
particles so small they can't be seen.

   3.  Superconducting magnets: used in Japan for fast 
trains, and may be a way of transmitting power over long 
distances with  minimal power losses.  Elementary particle 
physicists developed them to practical tools for the high 
energies they needed in their "particle accelerators". 

  4. And Cerenkov counter mirrors and light collection (like 
these in E865) have a lot in common with solar collectors, 
since they do a good job of collecting light at different 
angles.