Hi Adrian,
I think you really mean that none of the coincident protons punch
through the TOFs. However, I remember that a few years ago, you did
some GEANT simulations and did see a punch through peak. Perhaps
that's because energy loss before the YOFs was not taken into account
properly. Do you remember?
John
On Fri, 13 Jan 2006, Adrian T Sindile wrote:
> Hi,
> I have taken a look at the idea of isolating a well known kinematic region
> by studying the peak of the proton energy loss in the TOFs.
>
> I started by plotting the individual TOF ADCs versus proton momentum (please
> see attached leftPrEnLoss.gif and righPrEnLoss.gif files). Looking at them,
> I realized I should combine all the TOFs, since that way I could see a
> broader kinematic region. So I combined all of the TOFs (separate for left
> and right) in the attached enLoss.gif file.
>
> Since there was no "peak" in these plots (it seemed all the protons were
> punching through the TOF material) I asked Genya's opinion... in the end we
> realized the expected "peak" should appear for e-p elastic in a more
> backward region than the one covered by our TOFs.
>
> I should probably add that the study was done on the GOOD e-p events (after
> all cuts we use now when we plot asymmetries and Ge/Gm). I used about 10% of
> our data.
>
> Adrian
>
> -------------------------------
> Adrian Sindile
> Research Assistant
> Nuclear Physics Group
> University of New Hampshire
> phone: (603)862-1217
> FAX: (603)862-2998
> email: asindile@unh.edu
> http://einstein.unh.edu/~adrian/
>
-- John R. Calarco Dept. of Physics Univ. of New Hampshire Durham, NH 03824 phone: (603)862-2088 FAX: (603)862-2998 email: calarco@unh.edu
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