STERNHEIme

Summary

Allows to input Sternheimer density effect parameters ​​

​

See also MAT–PROP
WHAT(1) =

Sternheimer -C (\(\bar{C}\)) parameter

WHAT(2) =

Sternheimer X0 (X\(_0\)) parameter

WHAT(3) =

Sternheimer X1 (X\(_1\)) parameter

WHAT(4) =

Sternheimer AFACT (a) parameter

WHAT(5) =

Sternheimer SK (m) parameter

WHAT(6) =

Sternheimer DELTA0 (\(\delta_0\)) parameter (only for single elements)

SDUM

= index of the material to which the above Sternheimer parameters apply. Exceptionally, here SDUM must be an integer number, in free format, rather than a character string.

Default

(option STERNHEIme not given): density effect parameters are computed according to the Sternheimer-Peierls ​​ general formula

Notes

  1. For gases the parameters are supposed to be given at 1.0 atm (NTP)​; the code takes care to scale them to the actual pressure as given by the MAT–PROP card.

  2. MAT–PROP can be used also to override the value of the average ionisation potential​ used by the program. Recommended Sternheimer parameters and ionisation potentials are automatically provided by the program for elemental materials. For compounds and mixtures, see [Ste84].

  3. STERNHEIme is one of the two FLUKA options where SDUM is used to input numerical data. (Actually, the material number is first read as a string and then an internal reading is performed on the string to get the number).

Example:

*...+....1....+....2....+....3....+....4....+....5....+....6....+....7...+...8
MATERIAL         29.       0.0      8.96       12.       0.0       0. COPPER
STERNHEIme    4.4190   -0.0254    3.2792   0.14339    2.9044      0.08  12
*  Use the copper Sternheimer parameters published in At. Data Nucl. Data
*  Tab. 30, 261-271 (1984)