EXPTRANS¶

Summary

Requests an exponential transformation (“path stretching”)

NOT YET IMPLEMENTED!!!

WHAT(1) ≥ 0.0:: WHAT(2)…WHAT(5) are used to input a parameter defining the exponential transformation in various regions
< 0.0:: WHAT(2)…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 \(\eta\) (0.0 ≤ |\(\eta\)| < 1.0).

This value can be overridden in user routine UBSSET by assigning a value to variable EXPTR
Default: = 0.0
WHAT(3) =: lower bound (or corresponding name) of the region indices with exponential transformation parameter \(\eta\) = WHAT(2)

(“From region ``WHAT(3)``…”)
Default: = 2.0
WHAT(4) =: upper bound (or corresponding name) 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): and SDUM: not used

For WHAT(1) < 0.0:

WHAT(2) =: lower bound (or corresponding name) of the particle indices to which exponential transformation is to be applied

(“From particle ``WHAT(2)``…”)
Default: = 1.0
WHAT(3) =: upper bound (or corresponding name) 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) and SDUM: not used
Default: (option EXPTRANS not given): no exponential transformation is applied

Example (number based):

*...+....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

The same example, name-based:

EXPTRANS          1.       0.8  tenthReg  eighteen        8.       0.
EXPTRANS         -1.    PHOTON   NEUTRON        0.        0.       0.