Minutes from target meeting held September 5 2008 in 892-1-B09

These minutes are available also from:

http://wwwcompass.cern.ch/compass/detector/target/Minutes/2008/

a) Jaakko: program to calculate materials in ammonia target
http://wwwcompass.cern.ch/compass/detector/target/NMR/manNtools/nh3table.txt

The solid materials stayed the same like before
http://wwwcompass.cern.ch/elog/target_polar/64
but the amount of liquid helium-3 and helium-4 changed. The error in helium 
comes from considering possible cases of perfect mixing and perfect phase 
separation. Main contribution to the error is the uncertainty of the ammonia 
density. The volume of the target cells at low temperatures is not known to 
very high precision either.  

Buoyancy due to dense nitrogen gas around 100 K during material weighing 
gives small 0.3 - 0.6 g correction to the measured masses.

b) Jaakko: hydrogen bond scalar coupling gives NMR shifts of a fraction Hertz.
This can be observed in high resolution NMR studies and gives information on
the hydrogen bond in different molecules. 

A.J. Dingley et. al., An Introduction to Hydrogen Bond Scalar Couplings, 
Concepts in Magnetic Resonance 13 (2001) 103

N.F. Ramsey, Electron Coupled Interactions between Nuclear Spins in Molecules,
Phys. Rev. 91 (1953) 303