DRAGON MEETING  Tues Aug 9  10:45 Board Room
Attending : Strasbourg group, DFOT, DH, JC, AO, LB, JP, Dieter Frekers, 
            PM, GR, CR, MT, MMP, students

1. Report from Strasbourg group
	- 16O + 12C -> 28Si + g at 1.25 MeV/u is giving about 400 recoils
	per hour.  There are more singles gammas than in the previous
	12C + 12C experiment, and the beam current has been limited to
	10 particle-nA (20% dead-time) compared to 40 p-nA for the
	earlier exp't.
	- there is a strong peak at gamma energies 10-11 MeV, which was
	not seen in earlier work by Sandorfi
	- have moved to a second, slightly-higher, off-resonance beam
	energy
	- lost about 5 hr due to failure of polarity switch on HEBT:XCB6
	and several hours due to a DAQ problem [network outage?]
	- BGO gains have been observed to drop roughly 10% from the
	initial calibration of ~30 keV/channel.
	- many of the 12C targets from ANL have small holes in them.
	- next will be to do mass scans with 13C and SiO2 targets.

2.  E989 Progress  CR
 
   a) Benji showing progress in his ROOT tree analysis. basically setting up 
      the analysis machinery
      
      CR points out that entire date set can be processed in <1min, rather 
      than 30 in the old days

      lots of discussion about just how the analysis package works

      JP points out that all the various code functions to do things like 
      determine ion momentum are listed on the DRAGON operator information
      website (maybe under DragonRoot)

      lots of discussion about "learning curve" with new software.  age-old 
	issue that I won't bore you with.

      [images from Benji]


    b) Heather showing latest results of normalization studies

       issue with runs (approx) 14990-15030 where DSSSD was changed
          - not clear what is going on
          - will be treated differently

       for "good" runs, norm error ~11% (much larger ~25% for 'yellow' runs)

       R values for good runs  1375+-15   chi^2=62/54  using ROOT fitting

       [images from Heather]


     c) CR shows plot of DSSSD energy vs Run Number
           -  alpha contamination peak same position after DSSSD change
              BUT other peaks shifted ==>  transmission change (?)

        CR showed plots of "probability" analysis
           - upshot is that the MCP is useful in this run

        CR states that next step is to repeat the above with ROOT


     d)  DH states that after meeting with Vijay and Stu, a plan is in place 
	for a designer to work on an "iris" aperture to remove the ~1% of 
	leaky beam bothering the BGOs


     e)  DH made one "tiny" step towards angular correlation work


3. 22Na report by JC

     a)  a crew will head to Seattle tomorrow to check things out

     b)  JC reports that 2 shifts of implantation runs will happen in 
	 October (if draft beam schedule holds)

     c)  chamber is built and ready for use at UW


4. New business: 
   a) JC said that solution to "NMR-not-locking" problem due to 
	overheating electronics is to open door to rack to let it cool 
 
   b) DH gives agaenda items for next meeting: prep. for 40Ca(a,g) run, 
	status of 20Ne(p,g) analysis and of 11C analysis.
 

meeting adjourned at noon