= Release note version 1.0.0 =

== Bargmann-Michel-Telegi equation for the spin precession ==

=== equations ===
The treatment of the BMT equation for spin precession has been programmed. 
Let be the polarization defined by a normed vector with 3 components P (each component taking a value between -1 and +1)
The BMT precession equation is the following : 

  [[Image(bmt.png)]] 


The gyromagnetic anomaly a is normally equal to α/2π +O(α2), α being the fine structure constant. With a strong field a is a function of the field strenght, through the parameter : 

[[Image(upsilon.png)]] 

This interpolation for the gyromagnetic anomaly has been programmed with the aid of polynomial approximations. 


=== keywords === 

The BMT precessionis switched on by the keyword '''bmt_precession=1''' in the $PARAMETERS:: field. 

=== modification of the file formats === 
To each particle has been associated the normalized polarization 3-vector. This polarization is added to the file [wiki:BeamFormat beam1(2).dat].

In addition the order in the sequence of the particles have been randomized before output.