Hi Adrian,
I have seen the punch-through threshold in the data, just not from
pure elastic events. Once the momentum resolution is up to par, we
will be able to compare the TOF threshold momentum with the wire-
chamber momentum for these particles (on the radiative tail?).
--Chris
On Jan 13, 2006, at 16:11:13, Adrian T Sindile wrote:
> Hi John,
> I indeed had pre-commissioning GEANT simulations for both e-p and e-
> d elastic (which I just checked and they agree with our conclusion
> today, but we had all 8 Cerenkovs there at the time so I do not
> want to confuse matters more by sending outdated plots), I also had
> a comparison with real data from commissioning.
>
> However, at the time of that comparison we had out-bending field.
> So protons were inbending at that time, which meant slower, more
> backward protons were still reaching some TOFs... and they were
> stopped completely in the TOFs.
> With inbending field, that does not happen anymore.
>
> Adrian
>
> On Fri, 13 Jan 2006, John Calarco wrote:
>
>>
>> What I may be remembering are some GEANT simulations for recoil
>> deuterons
>> from elastic ed scattering. The most backward recoil protons from
>> coincident ep with forward angle electrons have ~55 MeV at the
>> target.
>> They can drop as much as 20 MeV on the way to the TOF and still punch
>> through. So I agree with you and Genya.
>>
>>
>
> --
>
> -------------------------------
> 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/
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