TSL-PWXS

Summary

sets the correspondence between the Fluka and the pointwise low energy neutron Thermal Scattering Law data sets

​​

WHAT(1)

isomer code of the target (Z x 10000 + A x 10 + m) Z, A, m, are the atomic, mass and isomer number of the isotope; no default, a value \(< 0\) resets the association to null. If WHAT(1) = 1.0, it is interpreted as to let FLUKA choose the correct Thermal Scattering Law data sets for all isotopes of the elements defined by WHAT(4)-WHAT(6).

WHAT(2)

material index for the Thermal Scattering Law, there is no default.

Currently supported (not all already implemented) for a specific isotope (WHAT(1) \(>\) 10000):

		=	1:	\(^1\)H in water (H\(_2\)O)
		=	2:	\(^1\)H in para-hydrogen
		=	3:	\(^1\)H in ortho-hydrogen
		=	7:	\(^1\)H in ZrH
		=	10:	\(^1\)H in ice
		=	11:	\(^2\)H in D\(_2\)O
		=	12:	\(^2\)H in para-deuterium
		=	13:	\(^2\)H in ortho-deuterium
		=	18:	\(^{40}\)Ar in Liquid Argon
		=	26:	\(^{27}\)Al in metallic Aluminum
		=	30:	\(^{12}\)C in crystalline graphite
		=	31:	\(^{12}\)C in reactor graphite, 10% porosity
		=	37:	\(^1\)H in polyethylene (CH\(_2\))
		=	43:	Si in Silicon Carbide (SiC)
		=	44:	C in Silicon Carbide (SiC)
		=	50:	\(^{16}\)O in Ice
		=	56:	\(^{56}\)Fe in metallic Iron
		=	58:	Zr in ZrH

For a generic association (WHAT(1) \(=\) 1):

		=	1:	Generic for XX in water (H\(_2\)O)
		=	2:	Generic for XX in para-hydrogen
		=	3:	Generic for XX in ortho-hydrogen
		=	7:	Generic for XX in ZrH
		=	10:	Generic for XX in ice
		=	18:	Generic for XX in Liquid Argon
		=	26:	Generic for XX in metallic Aluminum
		=	30:	Generic for XX in crystalline graphite
		=	31:	Generic for XX in reactor graphite, 10% porosity
		=	37:	Generic for XX in polyethylene (CH\(_2\))
		=	43:	Generic for XX in Silicon Carbide (SiC)
		=	44:	Generic for XX in Silicon Carbide (SiC)
		=	56:	Generic for XX in metallic Iron

WHAT(3)

pointwise xsec temperature (def.\(=296\), 0 is ignored, \(< 0\) resets to default), actually 0 or \(< 0\) behave the same

WHAT(4)

= from material “WHAT(4)” …. (def. 3)

WHAT(5)

= …. to material “WHAT(5)” …. (def. WHAT(4))

WHAT(6)

= …. in step of “WHAT(6)” (def. 1)

SDUM

=SDUM10 = extra string defining the release for the TSL cross sectionfile

(default=blank, the code will select which release to use if more then one are available).

The file name looked for by FLUKA in the directory

\(\$\)FLUPRO/pwxs is composed as:

\(<\)isomer code\(>\)-tsl-\(<\)bound mat\(>\)-\(<\)releasey\(>\)-\(<\)temp\(>\).pwx

where \(<\)bound mat\(>\) is defined in association with WHAT(2)

Notes

1. If pointwise Thermal Scattering Laws are requested for a compound the request is ignored. This card works only for elements, nevertheless it will silently ignore possible compounds included in the list defined by WHAT(4)-WHAT(6)

2. ​ The list of available isotopes and temperatures, as well as of the originating evluated data file can be easily obtained looking in the \(\$\)FLUPRO/pwxs directory for files \(...\)-tsl=\(...\)

Examples:

Associate the TSL for hydrogen in Ice at 228.15 K to all materials.
It will apply to both 1-H in hydrogen and 16-O in Oxygen since this TSL
exists for both, selecting the endfb8r0 release file:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
TSL-PWXS         1.0      10.0    228.15  HYDROGEN  @LASTMAT          endfb8r0

Associate the TSL for para-hydrogen at 20 K to the PARAHYD material. It
will apply to both 1-H and 2-H since the this TSL exists for both, which
release to use will be decided by FLUKA:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
MATERIAL         1.0             0.07085                              PARAHYD
TSL-PWXS         1.0       2.0      20.0   PARAHYD   PARAHYD