Source Problem. Point Californium-252 fission source in a water cylinder c ip.txt c M. Ragheb c University of Illinois at Urbana-Champaign c 2/9/2006 c ****************************************************************************** c Cells specifications c ****************************************************************************** 1 1 -1.0 -1 -2 3 $ Water cylinder, density 1.0 [gm/cm3] 2 0 1:2:-3 $ Outside world with zero importance c ****************************************************************************** c Surfaces specifications c ****************************************************************************** 1 cy 20.0 $ Cylinder about y axis 2 py 10.0 $ Plane along y axis, top of cylinder 3 py -10.0 $ Plane along y axis, bottom of cylinder c ****************************************************************************** c Data Input c ****************************************************************************** c Problem type mode n p $ Coupled neutron and photon problem phys:p $ Photon physics default values c Source definition sdef erg=d1 pos=0 0 0 $ Cf-252 point source at origin sp1 -3 1.025 2.926 $ Watt fission spectrum for Cf-252 c Importances imp:n 1 0 $ Neutron importances imp:p 1 0 $ Photon importances c Materials m1 1001 0.66667 8016 0.33333 $ Water using atomic fractions mt1 lwtr $ S(a,b) H2O thermal neutrons treatment c Tallies f1:n 1 2 3 (1 2 3) $ Neutron current on each surface and total f11:p 1 2 3 T $ Photon current on each surface and total f4:n 1 $ Average neutron flux in H2O cell f14:p 1 $ Average photon flux in H2O cell c Number of particle histories nps 10000 $ Run number of particle histories c Printing Results print $ Print all details of calculation c Execution Instructions using MCNP5 command prompt in Program files c C:\Program Files\LANL\MCNP5>mcnp5 i=ip.txt o=output1 xsdir=xsdir