BLAST detector subframe was open, presumably since the collimator was
installed, so no conclusions can be drawn about the effect of the
collimator on the detector. Any work done with just the BQMs is fine, as
the BQMs are attached to the beampipe, not the detector subframe. We'll
take more data today on empty and H2. Then we can make a new plot of z
distribution on empty, compare with and without the collimator.
Karen
At 04:59 PM 9/29/2003 -0400, Tancredi Botto wrote:
>Hello,
>
>I've attached two vertex spectra of normalized yields measured on an
>empty cell. In red, runs taken last week before the collimator went in.
>In blue the same data with collimator in. No cuts have been applied.
>
>The yield of reconstructed events decreased by more than 1/20. This is
>a remarkable result !!
>
>More to come when similar spectra will be made and compared for similar
>data taken at different beam/slits position. Regards,
>
>-- tancredi
>________________________________________________________________________________
>Tancredi Botto, phone: +1-617-253-9204 mobile:
>+1-978-490-4124
>research scientist MIT/Bates, 21 Manning Av Middleton MA,
>01949
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
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