(no subject)

From: John Clem (JMClem@comcast.net)
Date: Wed Feb 26 2003 - 04:02:03 CET


Zhen wu,

I assume you are referring to the standard FLUKA materials:
Fluka Fluka
 name number
BLCKHOLE 1
 VACUUM 2

Blackhole is defined as a material with a zero absorbing length or an infinite cross-section. All of the geometry regions must be contained within a surrounding blackhole region so that particles escaping the geometry of interest are stopped. The FLUKA vacuum has the expected opposite characteristics. It has a zero density and therefore a zero cross-section for all physical interactions. Only particle decay can occur..

John

  ----- Original Message -----
  From: wuzhen
  To: fluka-discuss@mi.infn.it
  Sent: Tuesday, February 25, 2003 21:45

  Dear fluka user,
  Who knows the difference between BLCKHOLE and VACUUM, these two Fluka materials?

  Best regards,
  Zhen wu



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