1 Maryvonne De JésusIlias/N3/WG5 meeting Neutron studies in Edelweiss “Suite” Valencia (Espana)15/04/2005.

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Presentation transcript:

1 Maryvonne De JésusIlias/N3/WG5 meeting Neutron studies in Edelweiss “Suite” Valencia (Espana)15/04/2005

2 Plan Germanium nuclear recoil angular distribution in Geant 3 Rock spectra propagation with Geant 3 and MCNPX

3 Angular distribution with Geant 321 Code THALYS used to calculate differential cross sections in the CM with Koning-Delaroche set of parameters and spherical nuclei (O. Bersillon, private communication : Proper reference to the code TALYS A.J. Koning, S. Hilaire and M. Duijvestijn, TALYS: Comprehensive nuclear reaction modeling Proceedings of the International Conference on Nuclear Data for Science and Technology - ND2004 Sep Oct. 1, Santa Fe, USA, to be published Proper reference to the optical model parameters for germanium A.J. Koning and J.P. Delaroche Local and global nucleon optical models from 1 keV to 200 MeV Nuclear Physics A 713 (2003) ) Correction :

4 Modification in the SUBROUTINE COLISN IF (KZI.eq.32) call MYCANG

5 Edelweiss-I neutron calibration with 232 Cf Simulation with modified Geant-321  Ratio Data/Simulation [15, 200 ] keV : 1.5  Data vs. simulation : good agreement in the nuclear recoil spectra

6 Propagation of neutrons through the LSM rock : Geant3 and MCNPX Initial rock spetra : - Spectrum calculated by V.Chazal ( Astroparticle Phys.9 (1996) ) Neutron production in the rock :  1.143x10e -7 n/s/cm 3  Neutron flux in lab reevaluated ( G.Chardin et al IDM 2002 ) En > 2 MeV :  1.6x10 -6 n/s/cm 2 -Spectrum calculated by R.Lemrani with code SOURCES : Neutron production in the rock :  1.133x10e -7 n/s/cm 3 Rock composition introduced in Geant 3 Measured rock composition : Density :  =2.65 g/cm 3

7 Geometries for simulations with geant3 : LabRock Air or PE Plane geometry

8 Results : LSM Geometry with scatterring LSM Geometry without scatterringPlane Geometry LSM Geometry with scatterring MCNPX V.Chazal SOURCES Geant 3 MCNPX V.Chazal SOURCES Geant 3 MCNPX V.Chazal SOURCES Geant 3

9 FLuxx10 -6 >1 MeV>2 MeV LSM DirectGeant 3V.Ch SOURCES MCNPXSOURCES LSM TotalGeant 3V.Ch SOURCES MCNPXSOURCES PLANEGeant3V.Ch SOURCES MCNPXSOURCES Plane + 60 cm polyethylene : reduction factor of ~  ~ 13x Results :

10 Summary and outlook - Relatively good agreement between the 2 codes G3 and MCNP -Continue code comparisons to understand the remaining discrepancies -Propagate the lab n spetrum through EDW-1 and EDW-II geometries to get correct nuclear recoil spectra for Germanium.