42-Mo- 94 JAEA EVAL-MAR09 K.Shibata, A.Ichihara, S.Kunieda+ DIST-MAY10 20091210 ----JENDL-4.0 MATERIAL 4231 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 09-03 The data above the resolved resonance region were evaluated by K.Shibata, A.Ichihara, and S.Kunieda /1/. The resolved resonance parameters were evaluated by T.Nakagawa. 09-12 Compiled by K.Shibata MF= 1 General information MT=451 Descriptive data and directory MF= 2 Resonance parameters MT=151 Resolved and unresolved resoannce parameters Resolved resonance region: below 20 keV Based on the experimental data of Weigmann et al./2/, Musgrove /3/, and Wang et al./4/. A negative resonance was placed so as to reproduce the capture cross section recommended by Mughabghab./5/ Unresolved resonance region: 20 keV - 1 MeV The parameters were obtained by fitting to the evaluated total and capture cross sections mentioned below. The unresolved parameters should be used only for self-shielding calculation. Thermal cross sections and resonance integrals at 300 K ---------------------------------------------------------- 0.0253 eV res. integ. (*) (barns) (barns) ---------------------------------------------------------- Total 6.1975E+00 Elastic 5.8583E+00 n,gamma 3.3923E-01 1.4745E+00 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. MF= 3 Neutron cross sections MT= 1 Total cross section Sum of partial cross sections. MT= 2 Elastic scattering cross section The POD calculations were not accepted, since a considerable underestimate was shown in the benchmark results with molybdenum reflectors for fast neutrons. As a result, the data were taken from JENDL-3.3. MT= 3 Non-elastic cross section Sum of partial non-elastic cross sections. MT= 4,51-91 (n,n') cross section Calculated with POD code /6/. MT= 16 (n,2n) cross section Calculated with POD code /6/. MT= 17 (n,3n) cross section Calculated with POD code /6/. MT= 22 (n,na) cross section Calculated with POD code /6/. MT= 28 (n,np) cross section Calculated with POD code /6/. MT= 32 (n,nd) cross section Calculated with POD code /6/. MT=102 Capture cross section Calculated with POD code /6/. MT=103 (n,p) cross section Calculated with POD code /6/. MT=104 (n,d) cross section Calculated with POD code /6/. MT=105 (n,t) cross section Calculated with POD code /6/. MT=106 (n,He3) cross section Calculated with POD code /6/. MT=107 (n,a) cross section Calculated with POD code /6/. MT=203 (n,xp) cross section Calculated with POD code /6/. MT=204 (n,xd) cross section Calculated with POD code /6/. MT=205 (n,xt) cross section Calculated with POD code /6/. MT=206 (n,xHe3) cross section Calculated with POD code /6/. MT=207 (n,xa) cross section Calculated with POD code /6/. MF= 4 Angular distributions of emitted neutrons MT= 2 Elastic scattering Calculated with POD code /6/. MF= 6 Energy-angle distributions of emitted particles MT= 16 (n,2n) reaction Neutron spectra calculated with POD/6/. MT= 17 (n,3n) reaction Neutron spectra calculated with POD/6/. MT= 22 (n,na) reaction Neutron spectra calculated with POD/6/. MT= 28 (n,np) reaction Neutron spectra calculated with POD/6/. MT= 32 (n,nd) reaction Neutron spectra calculated with POD/6/. MT= 51 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 52 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 53 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 54 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 55 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 56 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 57 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 58 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 59 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 60 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 61 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 62 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 63 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 64 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 65 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 66 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 67 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 68 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 69 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 70 (n,n') reaction Neutron angular distributions calculated with POD/6/. MT= 91 (n,n') reaction Neutron spectra calculated with POD/6/. MT= 203 (n,xp) reaction Proton spectra calculated with POD/6/. MT= 204 (n,xd) reaction Deuteron spectra calculated with POD/6/. MT= 205 (n,xt) reaction Triton spectra calculated with POD/6/. MT= 206 (n,xHe3) reaction He3 spectra calculated with POD/6/. MT= 207 (n,xa) reaction Alpha spectra calculated with POD/6/. MF=12 Gamma-ray multiplicities MT= 3 Non-elastic gamma emission Calculated with POD code /6/. MF=14 Gamma-ray angular distributions MT= 3 Non-elastic gamma emission Assumed to be isotropic. MF=15 Gamma-ray spectra MT= 3 Non-elastic gamma emission Calculated with POD code /6/.*************************************************************** * Nuclear Model Calculations with POD Code /6/ * *************************************************************** 1. Theoretical models The POD code is based on the spherical optical model, the distorted-wave Born approximaiton (DWBA), one-component exciton preequilibrium model, and the Hauser-Feshbach-Moldauer statis- tical model. With the preequilibrim model, semi-empirical pickup and knockout process can be taken into account for composite-particle emission. The gamma-ray emission from the compound nucleus can be calculated within the framework of the exciton model. The code is capable of reading in particle transmission coefficients calculated by separate spherical or coupled-channel optical model code. 2. Optical model parameters Neutrons: Coupled-channel optical model parameters /7/ Protons: Koning and Delaroche /8/ Deuterons: Lohr and Haeberli /9/ Tritons: Becchetti and Greenlees /10/ He-3: Becchetti and Greenlees /10/ Alphas: Lemos /11/ potentials modified by Arthur and Young /12/ 3. Level scheme of Mo- 94 ------------------------- No. Ex(MeV) J PI ------------------------- 0 0.00000 0 + 1 0.87110 2 + 2 1.57372 4 + 3 1.74250 0 + 4 1.86429 2 + 5 2.06762 2 + 6 2.12100 3 + 7 2.29520 4 + 8 2.32200 6 + 9 2.39322 2 + 10 2.42346 6 + 11 2.53410 3 - 12 2.56680 4 + 13 2.58000 3 - 14 2.61150 5 - 15 2.70300 3 - 16 2.73982 1 + 17 2.76810 4 + 18 2.80580 2 + 19 2.83590 3 - 20 2.85300 4 + ------------------------- Levels above 2.86300 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /13/ were used ---------------------------------------------------------- Nuclei a* Pair Esh T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV ---------------------------------------------------------- Mo- 95 13.125 1.231 0.096 0.761 -0.609 6.814 1.808 Mo- 94 12.185 2.475 -0.706 0.937 -0.368 10.169 2.853 Mo- 93 12.764 1.244 -1.843 0.892 -0.799 7.716 2.755 Mo- 92 11.967 2.502 -2.668 0.919 1.160 8.213 3.962 Nb- 94 12.820 0.000 0.583 0.682 -1.167 4.340 1.257 Nb- 93 11.549 1.244 0.114 0.953 -1.794 9.243 1.950 Nb- 92 11.929 0.000 -1.398 0.865 -1.533 5.684 1.717 Zr- 92 11.702 2.502 -0.002 0.862 0.426 8.855 3.325 Zr- 91 11.895 1.258 -1.229 0.879 -0.489 7.274 3.167 Zr- 90 11.748 2.530 -1.944 0.719 2.381 5.622 4.223 ---------------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Generalized Lorentzian (GLO) /14/ 6. Preequilibrium process Preequilibrium is on for n, p, d, t, He-3, and alpha. Preequilibrium capture is on. References 1) K.Shibata, A.Ichihara, S.Kunieda, J. Nucl. Sci. Technol., 46, 278 (2009). 2) H.Weigmann et al., 1971 Knoxville, 749 (1971). 3) A.R.de L.Musgrove, Nucl. Phys., A270, 108 (1976). 4) T.F. Wang et al., Nucl. Instrum. Meth. Phys. Research B, 266, 561 (2008). 5) S.F. Mughabghab, "Atlas of Neutron Resonances," Elsevier (2006). 6) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 7) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007). 8) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 9) J.M.Lohr, W.Haeberli, Nucl. Phys. A232, 381 (1974). 10) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 11) O.F.Lemos, Orsay Report, Series A, No.136 (1972). 12) E.D.Arthur, P.G.Young, LA-8626-MS (1980). 13) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 14) J.Kopecky, M.Uhl, Nucl. Sci. Eng. 41, 1941 (1990).