# Photofissions

From: francesca belloni (francesca.belloni2@studenti.unimi.it)
Date: Fri Jul 07 2006 - 08:04:24 CEST

• Next message: Guo Wen: "no decay happened"

Hello!
I'm making calculations about photofission in 238U target.
The geometry is the following:
a 25MeV electron beam impinges on a W slab.
The bremmstrahlung obtained are used to induce photofissions in a
238U target of S=1cm^2 and thickness = 100 microgram/cm^2.
In MCNP I obtained 10^-11 photossions per incident particle,
in Fluka 10^-4.
The geometry is simple and I can't find mistakes.

I use SCORE 220 to find high energy fission and then
look at the results in the end of the output file to see how many high
energy fissions, among those generated, are provoked by photons.
Could someone give a look, please?
Thanks a lot,
best regards,
Francesca Belloni

P.S.
Here (and in attach 'cause spaces here was changed by default)is the file
The only card I inserted in this version is SCORE
In attach there's also the complete file with other bodies.

TITLE
Photofission (50cm between target and converter)
DEFAULTS ICARUS
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
*
* 25 MeV Electron Beam with radius = 0.1 cm
BEAM -25.E-3 0.0 0.0 0.1 0.0 -1.ELECTRON
* The beam starts in point (0,0,549)
BEAMPOS 0.0 0.0 549.0 0.0 0.0 0.0
*
GEOBEGIN COMBINAT
Large box for black-hole
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
RPP 1 -5000.0 +5000.0 -5000.0 +5000.0 -5000.0 +5000.0
* Large box for external vacuum world
RPP 2 -1000.0 +1000.0 -1000.0 +1000.0 -9.57 +1050.0
* Box defining the room
RPP 3 -900.0 +900.0 -900.0 +900.0 140.43 +900.0
* Target
RCC 4 0.0 0.0 600.0 0.0 0.0 0.0000053
1.0
* Converter
RCC 5 0.0 0.0 550.0 0.0 0.0 0.2
2.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
END
*
*
* Region definition
*
*
* Blackhoole
001 6 +1 -2
* Concrete walls
002 6 +2 -3
* Void
003 6 +3 -4 -5
* Target
004 6 +4
* Converter
005 6 +5
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
END
GEOEND +5.0 +5.0 +14.0 0.0 0.0 -0.0 DEBUG
GEOEND 10.0 10.0 140.0 &
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* Material definition
MATERIAL 74.0 184.1472 19.3 26.0 TUNGSTEN
MATERIAL 74.0 186.1488 19.3 27.0 186-W
MATERIAL 0.0 0.0 19.3 28.0 WOLFRAN
MATERIAL 92.0 238.0289 18.9 29.0 238-U
*
*
* WOLFRAN
* Composition: 184-W=53.3% 186W=46.7%
COMPOUND -0.533 26.0 -0.467 27.0 WOLFRAN
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
* Material assignment
ASSIGNMA 1.0 1.0
ASSIGNMA 2.0 2.0
ASSIGNMA 2.0 3.0
ASSIGNMA 28.0 4.0
ASSIGNMA 29.0 5.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
PHOTONUC 1.0 26.0 29.0 1.0
*LAM-BIAS 0.0 -1.0E-0 29.0 7.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
EMFCUT -0.005 0.005 1.0 2.0 5.0
EVENTYPE -2.0 EVAP
PHYSICS 3.0 EVAPORAT
SCORE 219.0 220.0 221.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
RANDOMIZ 1.0
START 1000000.0
STOP

• application/octet-stream attachment: 90deg.inp

• application/octet-stream attachment: 25mev.inp

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