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How does they check the number of atoms in BEC?

  1. Jan 2, 2010 #1
    In wikipedia, I read about BEC. so I just wonder in that articles, so I write in this page.
    Adopt that article, " They did this by cooling a dilute vapor consisting of approximately
    two thousand rubidium-87 atoms to below 170nK using a combination of laser cooling
    and magnetic evaporative cooling."

    So I just wonder How they check the "two thousand rubidium-87 atoms"?

    It's my first time for writing in this forum, so maybe I choose wrong category.

    but please, if you understand what I mean, answer under this writing.
  2. jcsd
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