[BLAST_SHIFTS] shifts summary 21th A

From: vitaliy ziskin (vziskin@yahoo.com)
Date: Sat Dec 21 2002 - 07:51:37 EST


Smoothly took data on deuterium. I asked for the target holding field
to be turned off and BLAST field to be on full. By doing this the ops
actualy improved both current and lifetime. I collected about 12000
"neutrons" and 160660 "protons". This is after I require a Cerenkov on
the left (electron) side. If I do not require Cerenkov I get a lot more
"neutrons". Also I tried to cruedly correct for the acceptence
differences, the number of "protons" reduces to about 127000. If I look
at the events from the electron in three forward scintilators the
situation is following: "protons" - 34855 and "neutrons" - 4565. The
crossection ratio is 5:1 on top of the quesi-elestic peak. The
direction of the q-vector for the first three paddles is 60-52 which
corresponds to which tofs? At any rate, it seems that we might have too
many "neutrons", but more analysis is needed. It would be nice to have
tracking since the kinematics is not as simple as in hydrogen case.
Also I was unable to find (e,e'd) events. Presumable those events
should have a similar co-planiarity signature.

                                Cheers, Vitaliy



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