Meeting minutes Tuesday May 6th 2003

Present: AB, AH, CJ, CR, CW, DG, DH, DO, JDA, LB, MA, SE, recorder ML (scribe).

First we would like to welcome Mr. (Mike) Anderson to our group for the summer.

Corrections to last weeks minutes:
	DH: The first item from the facility hardware is singular and is being 
	machined, it is not finished. June is an ambitious finish time. Thus it 
	should be changed to read: the side plate for the solid target is being 
	machined.
	DH also noted his explanation for the double humped peak was wrong for a 
	high energy resonance. DH had analyzed a low energy run. LB's explanation 
	of the angular distribution is correct.
	The second sentence of item 2 should be changed to read: 'The following 
	points were made: -cooling detectors may allow the use of previously 
	damaged ones....'
	Separator is misspelled in the second last sentence of item 2 in the 
	section 12C Experiment Update.
	The second point in the second sentence of the third item in the section 
	12C Experiment Update, should be change to read: phi plot shows a large 
	gap at the position of the pumping tube.

Plans for wobbler studies:
	DH: we wish to explore the energy acceptance of DRAGON, these runs could 
	be done in less than a week.

Status of 12C(a,g)16O run:
	LB: There is a background in the singles spectra, which is always behind 
	the singles peak. DH suggested it might be 16O accelerated at 4/3 the 12C 
	energy. Later on in the meeting DH said if this scenario is correct we 
	could scale the ED's by 4/3 after tuning the beam to look for the 16O. 
	Another suggestion by SE and JDA was to make use of the IC and its mass 
	separation super powers on attenuated beam.
	LB: We still want to run at 0.81 and 0.75MeV/u, the 0.81MeV/u point should 
	be strong.
	LB: Flips through several gamma spectra and illustrates the possibility of 
	a 6.0MeV gamma transition present in all the low yield runs. The BGO cannot 
	distinguish between the 6.1 and the 6.0MeV gammas or the 6.9 and 7.1MeV 
	gammas. We may have to bring in some germanium detectors, and do a proper 
	analysis to show that the 6.0MeV gamma exists. This would be a very nice 
	feather in our cap.
	LB also plotted the FCCH to FC4 readings taken in the logbook. He shows 
	that there is up to 30% scatter in these ratios, and points out that 
	normalization is extremely difficult. Normally one might be able to use 
	the elastics to FCM2 readings but the elastics are poor which complicates 
	matters.
	LB may give a report to the EEC with among other things, hinting on more 
	beam to resolve the bone thrown our way regarding item 3c.
	Attached is a plot of the progress so far. The plot shown is 
	counts/FCM2/pressure vs. energy.

DG reports on his work:
	DG has been doing tests with a single NaI crystal and a known Cs source 
	strength, he wishes to show that calculated tables (Marion and Young or 
	GEANT) agree with his results.
	DG also simulated different Aluminum cover thicknesses, his results are 
	shown in the attachments. He shows that the required Aluminum thickness is 
	too big.
	DG also presents a list of things to do, see attachments.  

CR talks about GEANT simulation he will be working on:
	The DRAGON separator is split into three distinct sections, see attachments.
	Most of what was done previously is still OK. However there are a few notable 
	changes, namely the gas target, BGO and the end detectors which all need to be 
	updated.  

SE 21Na 545KeV runs:
	There is a low yield for these energy runs however they seem to agree 
	statistically. SE obtains an wg of 4.13 ±0.41stat ±0.43sys meV (see attachments).