The second level trigger requires at least one charged particle in
the wire chambers, so the BATS can't be used for protons in a (gamma, pn)
event -- no wire chamber coverage in front of the BATS, no track from the
neutron.
Karen
At 09:50 PM 9/7/2004 -0400, Zilu Zhou wrote:
>Hi Pete,
>
>nice to see that you are trying to attack the photo-channel(s), and
>nice to see that you have made some progresses already.
>for the moment, i personally do not have many suggestions or comments
>other than encouraging you to fish for more and cleaner event samples.
>
>with this said, i do have a couple of simple comments:
>
>1, although it is interesting to select events with gamma energy higher
> in the delta production region, i would personally be more interested
> at events with gamma energy lower than or similar to 100 MeV region.
> the event rates for the lower energy region is much higher.
> these events having lower proton and neutron momenta can be easierly
> selected using tof information. the only problem, i am not sure, is
> whether you can use the BAT scintillators for the protons going
> into the far backward angles. without BAT, it might be just the
> down-stream
> half of the target (trying to use this cut as well) is visible and hence
> the blast acceptance is really very small unfortunately for the
> photo channels.
> one may argue to utilize the reversed blast field to get some
> phase-space
> back for the lower energy protons in the back angles. so, the lower
> energy side is important if with the forward bending low-energy protons.
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