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TheNE

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- TL;DR Summary
- Does MCNP 6.2 produce recoil fission products (capable of transport)?

I am trying to simulate fission product ejection from thin fissile films in gas filled detectors (fission chamber). Does MCNP 6.2 produce recoil fission products that will be transported through the system?

I have enabled "heavy ion physics" (#), tried options 3 and 5 for NCIA on the neutron physics card, tried KCODE, BURN, and nothing seems to transport the fission products in my problem (measured with a F4:# tally in a void immediately beyond the fissile mass).

Thank you very much in advance for your assistance with this.

MCNP INPUT

c test for fp production and subsequent transport

c cell cards

1 1 -19 -10 VOL=523.6 imp:n=1 imp:#=1

2 0 -11 10 imp:n=1 imp:#=1

3 0 11 imp:n=0 imp:#=0

c surface cards

10 so 5

11 so 10

12 so 15

c data cards

c SDEF ERG=2.5E-6 PAR=1 POS= 6 0 0

c NPS 5E6

KCODE 1E6 0.4 0 10

KSRC 4.9 0 0

c BURN TIME=10 MAT=1 POWER=1

MODE N # P

PHYS:N 100 0 0 j j j 5 -1 j j j 0 0

MPHYS ON

c U-235 / rho=19g/cc

m1 92235 1

c ===================================

F14:# 2

F24:# 1

F34:P 2

I have enabled "heavy ion physics" (#), tried options 3 and 5 for NCIA on the neutron physics card, tried KCODE, BURN, and nothing seems to transport the fission products in my problem (measured with a F4:# tally in a void immediately beyond the fissile mass).

Thank you very much in advance for your assistance with this.

MCNP INPUT

c test for fp production and subsequent transport

c cell cards

1 1 -19 -10 VOL=523.6 imp:n=1 imp:#=1

2 0 -11 10 imp:n=1 imp:#=1

3 0 11 imp:n=0 imp:#=0

c surface cards

10 so 5

11 so 10

12 so 15

c data cards

c SDEF ERG=2.5E-6 PAR=1 POS= 6 0 0

c NPS 5E6

KCODE 1E6 0.4 0 10

KSRC 4.9 0 0

c BURN TIME=10 MAT=1 POWER=1

MODE N # P

PHYS:N 100 0 0 j j j 5 -1 j j j 0 0

MPHYS ON

c U-235 / rho=19g/cc

m1 92235 1

c ===================================

F14:# 2

F24:# 1

F34:P 2