requests an exponential transformation ("path stretching")
*******************************************
* (not implemented yet!!!!!!!!) *
*******************************************
WHAT(1) >= 0.0 : WHAT(2) to WHAT(5) are used to input a parameter
defining the exponential transformation in various
regions
< 0.0 : WHAT(2) to WHAT(5) are used to define the particles
to which the exponential transformation must be
applied
Default = 0.0
For WHAT(1) >= 0.0 :
WHAT(2) = exponential transformation parameter ETA
( 0 =< |ETA| < 1 )
This value can be overridden in the user routine UBSSET
(argument EXPTR in the calling list, see 13})
Default = 0.0
WHAT(3) = lower bound of the region indices with exponential
transformation parameter ETA = WHAT(2)
("From region WHAT(3)...")
Default = 2.0.
WHAT(4) = upper bound of the region indices with exponential
transformation parameter equal to WHAT(2)
("...to region WHAT(4)...")
Default = WHAT(3)WHAT(5) = step length in assigning indices. ("...in steps of
WHAT(5)").
Default = 1.0
WHAT(6), SDUM : not used
For WHAT(1) < 0 :
WHAT(2) = lower bound of the particle indices to which exponential
transformation is to be applied
("From particle WHAT(2)...")
Default = 1.0.
WHAT(3) = upper bound of the particle indices to which exponential
transformation is to be applied
("...to particle WHAT(3)...")
Default : = WHAT(2) if WHAT(2) > 0.0, otherwise = 40.0
(low-energy neutrons)
WHAT(4) = step length in assigning indices. ("...in steps of
WHAT(4)"). Default: 1.0
WHAT(5), WHAT(6), SDUM : not used
Default (option EXPTRANS not given): no exponential transformation
Example:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
EXPTRANS 1. 0.8 10. 18. 8. 0.
EXPTRANS -1. 7. 8. 0. 0. 0.
* Exponential transformation is requested for photons (particle no. 7)
* and neutrons (particle 8), in regions 10 and 18 with an ETA parameter
* equal to 0.8
