GPS Spin rotation on for simultaneous fit of ZF on 2-1, 3-4 groups
Assume one has a good calibration set: high T with full asymmetry and no internal field, measured in low Transverse Field (e.g. 50G).
This data set can be fitted as decay four independent histograms:
yielding four replica of the two relevant histogram-dependent parameters,
With these eight parameters one can do the following on any new data set of a subsequent ZF temperature scan:
1) determine the two following quantities for each group:
2) Fit the following data compositions:
But this amounts to simply checking the individual earlier fits.
Then, assuming and constant with temperature one could use in the subsequent temperature scan
which is an average asymmetry. The important parameter however is , to eliminate constant terms from the nominator of the fraction in the above expression. The other parameter, , simply produces a different average asymmetry. It is important to use the Fit values in the denominator, and not the values determined from Data.
Now in the double fit of Mulab-2.0 each pair has its own average asymmetry and the UD/FB ratio in the fit parameters takes that into account.
For a new muasymmetry.m
Unfortunately does not seem to converge...