Minutes of DRAGON Meeting, Jan 31st 2006.
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Present: DH, DO, JC, LB, DF, GR, MT, JP (recorder).

1.  Previous minutes were accepted without alterations.

2.  JP - Acceptance measurements.  Measurements are progressing;
    trying to understand data taken so far.  Moved back to TP7
    position to understand asymmetry in source spot.  Also had to
    implement detector cooling.

3.  LB - 12c(a,g) paper.
    MT - Previous simulations with GEANT-altered quads did not have
    the same results in reality.  Simulation has evolved, but has not
    predicted reality well in this one case.  Need to ask CR what is
    happening with GEANT and current status of code.
    LB - We get the same cross-section as Rolfs + ERNA, and this is
    predicted by GEANT.
    DH - Need to check what errors are given by the simulations etc,
    given that there are two papers (LB + CR) coming out soon.  What
    about checking simulation input-cards?  MT volunteers to do this.
    JC - Is uncertainty in acceptance within uncertainty of
    cross-section?  Does GEANT have fringe fields in quads?  It uses
    Ray-Trace.
    LB - Paper assumes 10% more in error than what GEANT predicts.
    Transmission of GEANT is ~80%, if it was higher cross-section
    would go up.

4.  GR - 22Na decay.
    See attachment of setup.  Claus Rolfs expected half-life to
    decrease if ions are implanted in a metallic environment.  Due to
    screening effect, can be understood well for say alphas but not
    for betas.  Rolfs expected 40% decrease in half-life at 10 K for
    22Na; from this it was concluded that you should see at least 9%
    at LN2 temperatures if it scales with sqrt(T) as given by the
    Debye-Huckel model.  Experiment took place in the DRAGON area on a
    table and had a 60Co reference source.  Analysis used rate
    differences between spectra to make the changes observable.  60Co
    lines show nothing but a statistical change.  For 22Na, there are
    no changes that are correlated to the temperature, probably more
    to do with activity in the ISAC hall (511 keV line affected by
    sources in the vicinity).  There could also be an effect due to
    the source-detector distance which can be sensitive to changes of
    1mm.  So, down to 1% level, effect does not appear real.

5.  AOB.
    DH - Accepted Joel Zylerberg, from SFU, as the summer student.
    Considering a second student.  Need to be prepared with projects
    suitable for summer students to work on e.g. acceptance
    measurements or 21Ne(p,g).
    JC - Ceramic tubes have been ordered for the ED's.  Tooling fee
    will be lost if this company (Morgan Advanced Ceramics) fails to
    construct the tubes - another company is 5-10 times more
    expensive.