34-Se- 82 JAEA EVAL-MAY09 S.Kamada, K.Shibata, A.Ichihara+ DIST-MAY10 20091117 ----JENDL-4.0 MATERIAL 3449 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 09-05 Evaluated by S. Kamada (TIT), K. Shibata (JAEA), A. Ichihara (JAEA) and S. Kunieda (JAEA) 09-10 Compiled by K. Shibata. MF= 1 General information MT=451 Descriptive data and directory MF= 2 Resonance parameters MT=151 Resolved and unresolved resonance parameters Resolved resonance region (MLBW formula) : below 18 keV Resonance energies were based on the experimental data by Browne and Berman/1/. The values of neutron orbital angular momentum L and total spin J were assumed to be 0 and 0.5 for all resonance levels, respectively. Reduced neutron width of each resonance level was roughly estimated on the basis of the description for resonance structures given by Browne and Berman, and of the reduced neutron widths given by Mughabghab et al./2/ in the first stage. Next, thermal scattering cross section was calculated using the roughly estimated reduced neutron widths, and a normalization factor was obtained so as to reproduce the experimental data of 5.0+-0.2 barns given by Mughabghab et al. The final neutron widths were determined by using this normalization factor and the resonance energies given by Browne and Berman. Scattering radius was taken from Mughabghab et al. Average radiation width was also determined so as to reproduce thermal capture cross section of 44.2 mb given by Mughabghab et al. A negative resonance was added at -120 eV in the present analysis. Unresolved resonance region: 18 keV - 1 MeV The parameters were obtained by fitting to the total and capture cross sections calculated from POD /3/. 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 5.0757E+00 Elastic 5.0315E+00 n,gamma 4.4214E-02 7.0976E-01 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. MF= 3 Neutron cross sections MT= 1 Total cross section Calculated with POD code /3/. MT= 2 Elastic scattering cross section Obtained by subtracting non-elastic cross sections from total cross sections. 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 /3/. MT= 16 (n,2n) cross section Calculated with POD code /3/. MT= 17 (n,3n) cross section Calculated with POD code /3/. MT= 22 (n,na) cross section Calculated with POD code /3/. MT= 28 (n,np) cross section Calculated with POD code /3/. MT=102 Capture cross section Calculated with POD code /3/. MT=103 (n,p) cross section Calculated with POD code /3/. MT=104 (n,d) cross section Calculated with POD code /3/. MT=105 (n,t) cross section Calculated with POD code /3/. MT=106 (n,He3) cross section Calculated with POD code /3/. MT=107 (n,a) cross section Calculated with POD code /3/. MT=203 (n,xp) cross section Calculated with POD code /3/. MT=204 (n,xd) cross section Calculated with POD code /3/. MT=205 (n,xt) cross section Calculated with POD code /3/. MT=206 (n,xHe3) cross section Calculated with POD code /3/. MT=207 (n,xa) cross section Calculated with POD code /3/. MF= 4 Angular distributions of emitted neutrons MT= 2 Elastic scattering Calculated with POD code /3/. MF= 6 Energy-angle distributions of emitted particles MT= 16 (n,2n) reaction Neutron spectra calculated with POD/3/. MT= 17 (n,3n) reaction Neutron spectra calculated with POD/3/. MT= 22 (n,na) reaction Neutron spectra calculated with POD/3/. MT= 28 (n,np) reaction Neutron spectra calculated with POD/3/. MT= 51 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 52 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 53 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 54 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 55 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 56 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 57 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 58 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 59 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 60 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 61 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 62 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 63 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 64 (n,n') reaction Neutron angular distributions calculated with POD/3/. MT= 91 (n,n') reaction Neutron spectra calculated with POD/3/. MT= 203 (n,xp) reaction Proton spectra calculated with POD/3/. MT= 204 (n,xd) reaction Deuteron spectra calculated with POD/3/. MT= 205 (n,xt) reaction Triton spectra calculated with POD/3/. MT= 206 (n,xHe3) reaction He3 spectra calculated with POD/3/. MT= 207 (n,xa) reaction Alpha spectra calculated with POD/3/. MF=12 Gamma-ray multiplicities MT= 3 Non-elastic gamma emission Calculated with POD code /3/. 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 /3/.*************************************************************** * Nuclear Model Calculations with POD Code /3/ * *************************************************************** 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 /4/ Protons: Koning and Delaroche /5/ Deuterons: Lohr and Haeberli /6/ Tritons: Becchetti and Greenlees /7/ He-3: Becchetti and Greenlees /7/ Alphas: Lemos /8/ potentials modified by Arthur and Young /9/ 3. Level scheme of Se- 82 ------------------------- No. Ex(MeV) J PI ------------------------- 0 0.00000 0 + 1 0.65469 2 + 2 1.40990 0 + 3 1.73130 2 + 4 1.73499 4 + 5 2.55010 4 + 6 2.62570 3 - 7 2.89356 5 - 8 3.00980 3 - 9 3.10500 4 + 10 3.29300 4 + 11 3.38400 3 - 12 3.44900 0 + 13 3.45403 5 - 14 3.58600 2 + ------------------------- Levels above 3.59600 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /10/ were used ---------------------------------------------------------- Nuclei a* Pair Esh T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV ---------------------------------------------------------- Se- 83 12.088 1.317 0.801 0.772 -0.514 6.837 1.331 Se- 82 10.867 2.650 1.071 0.699 1.874 6.455 3.586 Se- 81 10.589 1.333 1.999 0.755 -0.063 6.204 2.253 Se- 80 10.645 2.683 2.442 0.815 0.539 8.768 3.226 As- 82 10.840 0.000 0.258 0.718 -0.630 3.694 0.250 As- 81 10.293 1.333 1.087 0.887 -0.699 7.642 1.672 As- 80 10.620 0.000 1.706 0.844 -2.110 6.181 0.361 Ge- 80 10.645 2.683 0.595 0.756 1.750 6.939 3.515 Ge- 79 11.220 1.350 1.398 0.797 -0.544 7.026 1.187 Ge- 78 10.422 2.717 1.923 0.879 0.265 9.473 2.439 ---------------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Generalized Lorentzian (GLO) /11/ 6. Preequilibrium process Preequilibrium is on for n, p, d, t, He-3, and alpha. Preequilibrium capture is on. References 1) J.C.Browne, B.L.Berman, Phys. Rev. C26, 969 (1982). 2) S.F.Mughabghab et al., "Neutron Cross Sections, Vol. I, Part A", Academic Press (1981). 3) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 4) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007). 5) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 6) J.M.Lohr, W.Haeberli, Nucl. Phys. A232, 381 (1974). 7) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 8) O.F.Lemos, Orsay Report, Series A, No.136 (1972). 9) E.D.Arthur, P.G.Young, LA-8626-MS (1980). 10) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 11) J.Kopecky, M.Uhl, Nucl. Sci. Eng. 41, 1941 (1990).