Posted by **Phyllis** on Tuesday, December 21, 2010 at 1:18am.

Compute the average number of interactions per bunch crossing for a luminosity L=2.5E31 cms-1,if the total cross section is sigma =20mb and bunch crossing occur every T=4.What is the probability of having zero interactions in a bunch?

- physics -
**drwls**, Tuesday, December 21, 2010 at 1:28am
What is a bunch crossing? Bunch of what?

What are mb units? Millbarnes?

cm/s is not a unit of luminosity

What is T? What are its units?

this is jibberish

- physics -
**Dr Russ**, Tuesday, December 21, 2010 at 5:52am
Trying to sort out the units.

20 mb = 20 millibarns (mbarn)?

the luminosity is presumably cm2 s^-1

because by definition

event rate = luminosity * cross section

Not sure of units of T ns?

## Answer this Question

## Related Questions

- Math - If there's one child that can be zero interactions if there are two ...
- math - A playground is being designed where children can interact with their ...
- Physics - A train 500 m long is moving on a straight track with a speed of 84.2 ...
- physics - A train 400 m long is moving on a straight track with a speed of 80.1 ...
- physics - A train 400 m long is moving on a straight track with a speed of 80.1 ...
- Math - Eight-ninths of a bunch of marbles remain on a table. The square root of ...
- organic chemistry - How many steric interactions are there in CIS-1,3-...
- English - 1) Can you tell me if the word "counter of frozen food, frozen food ...
- CHEM URGENT - liquid methanol, CH3OH is being prepared to be poured into a ...
- Physics - A boat sets off perpendicular to the bank, to cross a river width of ...

More Related Questions