41-Nb- 95 JAEA EVAL-NOV09 A.Ichihara, K.Shibata, S.Kunieda+ DIST-MAY10 20100209 ----JENDL-4.0 MATERIAL 4131 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 09-11 The data above the neutron energy 25 eV were calculated by the POD code/1/. 09-11 Compiled by A.Ichihara. MF= 1 General information MT=451 Descriptive data and directory MF= 2 Resonance parameters MT=151 Unresolved resonance region : 25 eV - 500 keV The unresolved resonance parameters were calculated using the ASREP code/2/. The 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 1.277E+01 Elastic 5.731E+00 n,gamma 7.003E+00 5.868E+01 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. MF= 3 Neutron cross sections Below 25 eV, the capture and elastic scattering cross sections were assumed to be in 1/v form and constant, respectively. The capture cross section at 0.0253 eV was adopted from ref./3/ and the scattering cross section was calculated from R = 6.7 fm. Unresolved resonance parameters were given in the energy range from 25 eV to 500 keV. MT= 1 Total cross section Calculated with POD code /1/. MT= 2 Elastic scattering cross section Calculated as (total - sum of partial cross sections). MT= 3 Non-elastic cross section Calculated as sum of partial cross sections. MT= 4,51-91 (n,n') cross section Calculated with POD code /1/. MT= 16 (n,2n) cross section Calculated with POD code /1/. MT= 17 (n,3n) cross section Calculated with POD code /1/. MT= 22 (n,na) cross section Calculated with POD code /1/. MT= 28 (n,np) cross section Calculated with POD code /1/. MT= 32 (n,nd) cross section Calculated with POD code /1/. MT=102 Capture cross section The gamma-ray strength function for s-wave resonances was estimated to be 45.5 (10^-4) in the POD code/1/. MT=103 (n,p) cross section Calculated with POD code /1/. MT=104 (n,d) cross section Calculated with POD code /1/. MT=105 (n,t) cross section Calculated with POD code /1/. MT=106 (n,He3) cross section Calculated with POD code /1/. MT=107 (n,a) cross section Calculated with POD code /1/. MT=203 (n,xp) cross section Calculated with POD code /1/. MT=204 (n,xd) cross section Calculated with POD code /1/. MT=205 (n,xt) cross section Calculated with POD code /1/. MT=206 (n,xHe3) cross section Calculated with POD code /1/. MT=207 (n,xa) cross section Calculated with POD code /1/. MF= 4 Angular distributions of emitted neutrons MT= 2 Elastic scattering Calculated with POD code /1/. MF= 6 Energy-angle distributions of emitted particles MT= 16 (n,2n) reaction Neutron spectra calculated with POD/1/. MT= 17 (n,3n) reaction Neutron spectra calculated with POD/1/. MT= 22 (n,na) reaction Neutron spectra calculated with POD/1/. MT= 28 (n,np) reaction Neutron spectra calculated with POD/1/. MT= 32 (n,nd) reaction Neutron spectra calculated with POD/1/. MT= 51 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 52 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 53 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 54 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 55 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 56 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 57 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 58 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 59 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 60 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 61 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 62 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 63 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 64 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 65 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 66 (n,n') reaction Neutron angular distributions calculated with POD/1/. MT= 91 (n,n') reaction Neutron spectra calculated with POD/1/. MT= 203 (n,xp) reaction Proton spectra calculated with POD/1/. MT= 204 (n,xd) reaction Deuteron spectra calculated with POD/1/. MT= 205 (n,xt) reaction Triton spectra calculated with POD/1/. MT= 206 (n,xHe3) reaction He3 spectra calculated with POD/1/. MT= 207 (n,xa) reaction Alpha spectra calculated with POD/1/. MF=12 Gamma-ray multiplicities MT= 3 Non-elastic gamma emission Calculated with POD code /1/. 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 /1/.*************************************************************** * Nuclear Model Calculations with POD Code /1/ * *************************************************************** 1. Theoretical models The POD code is based on the spherical optical model, the distorted-wave Born approximation (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: Koning and Delaroche /4/ Protons: Koning and Delaroche /4/ Deuterons: Lohr and Haeberli /5/ Tritons: Becchetti and Greenlees /6/ He-3: Becchetti and Greenlees /6/ Alphas: Lemos /7/ potentials modified by Arthur and Young /8/ 3. Level scheme of Nb- 95 Nuclear discrete levels were obtained from RIPL-2/9/. ------------------------- No. Ex(MeV) J PI ------------------------- 0 0.00000 9/2 + 1 0.23568 1/2 - 2 0.72420 7/2 + 3 0.73000 5/2 + 4 0.75673 7/2 + 5 0.79900 3/2 - 6 1.01100 5/2 - 7 1.08800 1/2 + 8 1.21900 3/2 - 9 1.27300 5/2 - 10 1.36400 7/2 - 11 1.43000 3/2 + 12 1.51400 7/2 - 13 1.58900 3/2 - 14 1.59000 3/2 + 15 1.62300 5/2 + 16 1.64500 3/2 - ------------------------- Levels above 1.65500 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /10/ were used --------------------------------------------------- Nuclei a* Pair T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV --------------------------------------------------- Nb- 96 12.360 0.000 0.731 -1.875 5.488 1.537 Nb- 95 11.759 1.231 0.764 -0.621 6.845 1.645 Nb- 94 12.822 0.000 0.711 -1.426 4.810 1.405 Nb- 93 11.549 1.244 0.969 -1.995 9.571 2.037 Zr- 95 11.637 1.231 0.686 0.201 5.420 2.372 Zr- 94 12.185 2.475 0.769 0.465 8.300 2.908 Zr- 93 12.414 1.244 0.757 -0.394 6.540 2.548 Y - 93 11.549 1.244 0.710 0.014 5.795 2.070 Y - 92 11.929 0.000 0.493 0.199 1.501 2.900 Y - 91 11.338 1.258 0.772 0.115 5.977 2.689 --------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Standard Lorentzian (SLO) /11/ The position and width parameters in the E1 radiation were taken from the tabulation of Dietrich and Berman/12/. 6. Preequilibrium process Preequilibrium is on for n, p, d, t, He-3, and alpha. The single particle state density parameters were 8.222, 7.801, 7.640, 7.390, 7.990, 7.742, 7.612 (MeV^-1) for Nb-96, Nb-95, Zr-95, Y-92, Zr-94, Zr-93, and Y-93. Effects of the particle pickup (and knockout for alpha) were estimated using the semi-empirical formulas by Kalbach/13/. These components were multiplied by a factor of two and added to the statistical model calculation. Preequilibrium capture is on (the parameters were obtained from /12/). References 1) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 2) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 3) S.F.Mughabghab et al., "Neutron Cross Sections, Vol. I, Part A," Academic Press (1981). 4) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 5) J.M.Lohr, W.Haeberli, Nucl. Phys. A232, 381 (1974). 6) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 7) O.F.Lemos, Orsay Report, Series A, No.136 (1972). 8) E.D.Arthur, P.G.Young, LA-8626-MS (1980). 9) T.Belgya et al., IAEA-TECDOC-1506 (2006). 10) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 11) M.Brink, Ph.D thesis, Oxford University, 1955. 12) S.S.Dietrich, B.L.Berman, Atom. Data Nucl. Data Tables, 38, 199 (1988). 13) C.Kalbach, Z. Phys. A283, 401 (1977).