Where are the recrunched runs from v3_4_4, specifically, 11252-12013?
They're not in /net/data/9/Analysis/data/v3_4_4
Quoting Michael Kohl <kohlm@mit.edu>:
> Attending EG,VZ,TA,BT,CC,AS,MK
>
> -We should have a rate monitor for (e,e'p, e,e'd, e,e'n) candidate
> events per Coulomb and log this run-by-run.
>
> -Discussing the beam blowup effect. The beam blowup has been
> quantified by VZ for the neutron trigger by comparing the normalized
> quasielastic (e,e'n) rates for empty target and for hydrogen target
> (there is no quasielastic e,e'n production rate from the proton
> target ...). Therefore this is sensitive to any additional production
> from cell walls when the target is filled with hydrogen. The result
> is that the blowup factor is very close to 1.
>
> -It may be that the beam blowup effect is different for e,e'p from
> hydrogen. In principle, one would have to look at a channel that is
> forbidden in the reaction under consideration. One such channel could
> be the (e,e'pi-) rate which would require the presence of neutrons in
> the target. A comparison of (e,e'pi-) with empty and with hydrogen
> target could be an alternative way to quantify the blowup effect in
> the charged-trigger channel trig=1
>
> -Another way to quantify the background for p(e,e'p) is to vary the
> cuts on the elastic peak while looking at the observables, or to
> sample the elastic peak and tail region. Pure radiative-tail events
> should exhibit the same asymmetry like elastic events (radiative
> effect is mostly independent of polarization), while any change of
> the
> background contribution may dilute the asymmetry (unpolarized
> background) or change the asymmetry (polarized background, e.g. from
> pion production events that range in)
>
> -The cell background fraction is different for the (e,e'p) and (e,e'n)
>
> channels: N_empty/N_deut (e,e'p) > N_empty/N_deut (e,e'n). A possible
>
> reason could be that the ratio of e,e'p/e,e'n is different for
> scattering from aluminum and for deuterium.
>
> -The missing momentum in p(e,e'p) is also sensitive to background
> from other sources than hydrogen. It should peak at a very small value
>
> suggested by the resolution (20?? MeV/c?) whereas in quasielastic
> scattering it should peak around 50 MeV/c for deuterium and 80-100MeV/c
>
> for heavier nuclei.
>
>
>
> -The definition of the dataset for the next release of preliminary
> data will be "BLAST 2004", including all deuterium and hydrogen data
> of 2004. This will be the data shown at coming conferences and on
> other occasions. It extends the previous preliminary dataset on
> deuterium by about four weeks of running in Sept/Oct 2004, and for
> hydrogen it will be extended by the whole run of Oct-Dec 2004.
> The 2005 data is not at a stage where a preliminary version may
> be released. Nevertheless at next week's collaboration meeting the
> present status of the analysis also of the 2005 data shall be
> discussed. People should therefore prepare results separately for the
> BLAST 2004 dataset and the 2005 or 2004+2005 data!
> We shall have a projected gain of the figure-of-merit for the 2005 run
> by
> next week that may be quoted in presentations.
>
> -Plan is to have all data calibrated and recrunched by the next
> collaboration meeting end of June / early July (= pre-final data)
>
> -After this some fine-tuning may still be necessary. We shall push hard
> to
> get final results for the "key reactions" (GEn, T20, A_ed^V(e,e'p),
> GEp/GMp by fall!
>
>
> -I will send out an agenda for the coming big meeting on Wednesday 4/6
>
> soon.
>
>
> Regards,
>
> Michael
>
> --
>
> +-------------------------------------+--------------------------+
> | Office: | Home: |
> |-------------------------------------|--------------------------|
> | Dr. Michael Kohl | Michael Kohl |
> | Laboratory for Nuclear Science | 5 Ibbetson Street |
> | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 |
> | Middleton, MA 01949 | U.S.A. |
> | U.S.A. | |
> | - - - - - - - - - - - - | - - - - - - - - -|
> | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de |
> | Work: +1-617-253-9207 | Home: +1-617-629-3147 |
> | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 |
> | http://blast.lns.mit.edu | |
> +-------------------------------------+--------------------------+
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
--------------------------------------------------------------------------
Eugene Geis
PhD Student, Physics Department, ASU
Research Affiliate, MIT-Bates Laboratory of Nuclear Science
eugene.geis@asu.edu
--------------------------------------------------------------------------
http://quickreaction.blogspot.com
This archive was generated by hypermail 2.1.2 : Mon Feb 24 2014 - 14:07:32 EST