Meeting minutes Tuesday 20th May 2003

Present: AB, CG, CR, DH, JR, LB, MA (scribe), ML, ZL

1. Corrections to last weeks minutes: Just spelling errors.

2. Facility mini status report.
	DH: Turbo backing line seems to be working again.
	MA: Preliminary Wobbler results done. There is a strange response
	 in the x-direction, with a cutoff at around +10 mrad in 
	 transmission to FCM and FCF. There is no such cutoff observed at 
	 FCCH and no cutoff observed in Y.
	DH: This could be partially explained by a feature of the optics, 
	 due to intentional sextupole components in one of the quadrapoles.
	JR: Could be due to beam position and direction. If so, possible 
	 solution could be some sort of hardware upstream of target. 
	CR: Possible to use the "good" side of the DSSD to determine proper 
	 transmission, ie. could use symmetry of the reaction. 

3. Status/plans for 12C(a,g)
	JR: Software has been put together which analyzes the elastic data. 
	 The software removes false counts, possibly from pump noise, and 
	 finds "good" runs of elastic data at each energy. The software 
	 finds runs with low noise and which stay more or less constant 
	 through time, but strange features are seen in the spectra. The 
	 elastic cross-section has yet to be converted to countsand the 
	 elstic counts should be checked against known FC4 values. 
	LB: The S-factor plot looks slightly smoother after correcting for 
	 live time. The energy calibration of the detector was found to be 
	 a line. The deviation from this line was then plotted and found to 
	 be very odd. The width of coincidence peaks was looked at and 
	 found to be narrower than theory, and the peak shapes very strange. 
	 These are possibly due to the gamma detector efficiency and 
	 position, or due to the acceptance problems. A possible energy 
	 level at 6.05 MeV could be getting observed.
	ZL: Gamma peak channel number was plotted as a function of energy. 
	 There was a strange deviation from linear, which is possibly 
	 explained by the energy level at 6.05 MeV. Then the recoil 
	 coincidence peak position was examined as a function of energy, 
	 and found to have two peaks at high energy.
	LB: This shape is mirrored in other data.