TEST 1 -- MATERIAL ORDERED TABLES 0 1 0 1 1 1 0 3 0 0 30 2 34 0 0 3 1 6 1 1 CARBON TUNGST U-235 * */ 1 1 CNAT/ 2 1 W182 .263/ 2 1 W183 .143/ 2 1 W184 .307/ 2 1 W186 .286/ 3 1 U235/ HEAT 1 HEAT 1.602E-19/ CONVERTED TO JOULE-BARNS STOPThe cross sections will be read from a file named
MATXS,
and the neutron tables will be printed and
written onto a file named CARD as 6E12
cards in material
ordering. Fission will be steady state, and the BHS transport
correction will be used. Because two tables are requested (P0
and P1), the BHS correction will be derived from the P2
data on the library. The table length of 34 is enough to
accommodate all 30 groups, the three standard edits ($\sigma_a$,
$\bar{\nu}\sigma_f$, $\sigma_t$), and one special edit. There are no
upscatter positions or thermal groups requested. Three output
materials are defined with the names given. Note that these names
are independent of the isotopes on the library and will only be
used to label the output and to name the materials on the output
file CARD. The materials lie in a region with temperature
300 K (by default) and a blank name, but ``region'' has no other
significance here in the absence of an input flux or
self-shielding. The six mix instructions use default values for
simplicity. This table works as follows: The material
HMIX is multiplied by DENS (default=1.) and added
into mixture IMIX. The names used for HMIX must
correspond exactly to material names on the MATXS library. The
use of atom fractions for DENS in mix 2 produces the
correct microscopic cross sections for natural tungsten. Later
examples will show how to generate mixed macroscopic cross
sections. The response edit ``HEAT'' is intended to give
nuclear heating in watts/cm$^3$ when folded with a flux in a
transport code. The table works just like the mix table. The
cross section HEDNAM from the MATXS library is multiplied
by EDFACT and added into position JEDPOS. The
EDFACT shown here converts KERMA factors from eV-barns to
Joule-barns. Just as for material names, the reaction names
(e.g., HEAT) for HEDNAM must correspond to names
on the library, but the edit name (e.g., HEAT) is only
used for labeling the output. The last card is read as the title
for the next case, but ``STOP'' has the special meaning
of ending the run. The meaning of these input parameters may be
clarified by the partial listings of the OUTPUT and
CARD files here.
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