Minutes: 22 April 2003

Present: JR, JD, HO, AC, AO, CW, CR, SE, AB, ML, ZL, LB, WL, DO, DG and DH.
Recorder: CJ

-There was a brief discussion regarding that fact that lin01 was getting 
 full, and files needed to be moved or deleted.

-Since the new scaling routine works, we shall use it instead of the old 
 routine.

-LB noted that people are neglecting to record important numbers like gas 
 target pressure readings and FC4 currents in the logbook.

-JR recommends that people type the gs target pressure, beam energy, FC4 
 current, etc. in the comment line when starting a run.

-CR noted that the new tune scaling program provided bad NMR settings. 
 DH said that the poor settings were probably due to use of a poor 
 reference tune.

-It was suggested that we all agree on a good reference tune, and write 
 its filename on the white board in the counting room.

-AO is leaving until 24 May.

-DH and HO recommended that when we change energies, we should begin tuning
 by recalling a "gold standard" reference tune.

-JR analysed the energies of the gammas that cascades and ground state 
 transitions produced.

	+He displayed three figures, all of which are attached to the 
	 minutes. The first figure (attachment 1) contained several offline
	 spectra of the cg0 E. The second (attachment 2) was a plot of Beam
	 EreQ (MeV/u) versus gamma-yield per (FCM2*P)(counts*torr)-1 for 12
	 C(a,g)16O. The third (attachment 3) was of several off-line 
	 spectra of cg0 E x cg1 E.

	+There was a discussion of the distribution of gamma energies for
	 various possibilities of direct and gamma-cascade transition
	 combination.

-Future plans for 12C

	+We have 10 more days of 12C beam.

	+JR would like to look at the left side of the resonance 
	 (E < 1.05 MeV/u).

	+LB recommended that we try to run at two energies per day. He said
	 that if you can obtain an energy change by noon, that you should
	 request another change at 7 or 8 pm.

	+LB suggested we measure the charge state distributions for the 12C
	 beam and for the recoils at the 2+ state.

	+DH said that, since ED2 is not conditioned for it, that 
	 measurements for q = 5+ would be difficult.

	+LB predicted that we should get about 20 0 counts in 2 hours. He
	 said that at the top of the resonance curve, he would like to
	 obtain 3,000 to 6,000 counts.

	+Next week, we may consider installing the MCP, and moving to lower 
	 energies.

-HO and JR fixed the elastics with a mesh that produces a field-free region.
 They also changed the voltage to 40 V to pull back the elections.

-WL presented his proposal for the 11C(p,g)12N experiment. A copy of his 
 presentation is attached (attachment 4) to the minutes.