54-Xe-129 JAEA EVAL-FEB22 S.Kunieda, A.Ichihara, K.Shibata+ DIST-MAY10 20100316 ----JENDL-4.0 MATERIAL 5440 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 09-11 Re-evaluation was performed for JENDL-4.0 10-03 Compiled by S.Kunieda 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 2.7 keV Resonance parameters of 69 levels given in JENDL-3.3 were reexaminated on the basis of the measurements by Ribon et al./1/ As a result, a missing level at 1951.3 eV was found. The neutron widths of 70 levels were derived from the measured g*(neutron width) data. Unknown values of total spin j were partly estimated from the difference between total width and radiation width. For the levels whose total width was unknown, the j-values were tentatively estimated with a random number method. For the 9 levels whose the radiation width was unknown, the averaged value 102.1 meV of the radiation widths were adopted. The orbital angular momentum l was assumed to be 0 for all resonance levels. The scattering radius was taken from the graph (fig. 1, Part A) given by Mughabghab et al./2/. The parameters at 9.5 eV were replaced with those at 9.66 eV obtained by Skoy et al./3/ A negative resonance level was added at -50 eV so as to reproduce the thermal capture cross section of 22+-3 barns at 0.0253 eV measured by Lucas et al./4/. - Unresolved resonance region: 1.7 keV - 200 keV The parameters were obtained by fitting to the total and capture cross sections calculated by the POD code /5/. The ASREP code /6/ was employed in this evaluation. The unresolved parameters should be used only for self-shielding calculation. Thermal cross sections & resonance integrals at 300 K ---------------------------------------------------------- 0.0253 eV res. integ. (*) (barns) (barns) ---------------------------------------------------------- Total 2.70758E+01 Elastic 5.06521E+00 n,gamma 2.20106E+01 3.05363E+02 ---------------------------------------------------------- (*) 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 OPTMAN /7/ & POD /5/ calculations. MT= 3 Non-elastic cross section Sum of partial non-elastic cross sections. MT= 4,51-91 (n,n') cross section The OPTMAN /7/ & POD /5/ calculations. MT= 16 (n,2n) cross section MT= 17 (n,3n) cross section MT= 22 (n,na) cross section MT= 28 (n,np) cross section MT= 32 (n,nd) cross section Calculated by the POD code /5/. MT=102 Capture cross section Calculated by the POD code /5/. The value of gamma-ray strength function was determined to reproduce experimental capture cross sections measured by Reifarth et al /8/. MT=103 (n,p) cross section MT=104 (n,d) cross section MT=105 (n,t) cross section MT=106 (n,He3) cross section MT=107 (n,a) cross section Calculated by the POD code /5/. MT=203 (n,xp) cross section Sum of (n,np) and (n,p) MT=204 (n,xd) cross section Sum of (n,nd) and (n,d) MT=205 (n,xt) cross section MT=206 (n,xHe3) cross section Calculated by the POD code /5/. MT=207 (n,xa) cross section Sum of (n,na) and (n,a) MF= 4 Angular distributions of emitted neutrons MT= 2 Elastic scattering The OPTMAN /7/ & POD /5/ calculations. MF= 6 Energy-angle distributions of emitted particles MT= 16 (n,2n) reaction MT= 17 (n,3n) reaction MT= 22 (n,na) reaction MT= 28 (n,np) reaction MT= 32 (n,nd) reaction Neutron spectra calculated by the POD code /5/. MT= 51-90 (n,n') reaction Neutron angular distributions calculated by OPTMAN /7/ & POD /5/. MT= 91 (n,n') reaction Neutron spectra calculated by the POD code /5/. MT= 203 (n,xp) reaction MT= 204 (n,xd) reaction MT= 205 (n,xt) reaction MT= 206 (n,xHe3) reaction MT= 207 (n,xa) reaction Light-ion spectra calculated by the POD code /6/. MF=12 Gamma-ray multiplicities MT= 3 Non-elastic gamma emission Calculated by the POD code /5/. 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 by the POD code /5/.*************************************************************** * Nuclear Model Calculations with POD Code /5/ * *************************************************************** 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 preequilibrium 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. In this evaluation, the OPTMAN code /7/ was employed for neutrons, while the ECIS code /9/ was adopted for charged particles. 2. Optical model & parameters Neutrons: Model: The coupled-channel method based on the rigid-rotor model was adopted. Deformation parameter beta2 was taken from ref./10/ OMP : Coupled-channel optical potential /11/ was applied. Protons: Model: Spherical OMP : Koning and Delaroche /12/ Deuterons: Model: Spherical OMP : Bojowald et al. /13/ Tritons: Mode: Spherical OMP : Becchetti and Greenlees /14/ He-3: Model: Spherical OMP : Becchetti and Greenlees /14/ Alphas: Model: Spherical OMP : A simplified folding model potential /15/ (The nucleon OMP was taken from Ref./11/.) 3. Level scheme of Xe-129 ------------------------------------ No. Ex(MeV) J PI CC ------------------------------------ 0 0.00000 1/2 + * 1 0.03958 3/2 + 2 0.23614 11/2 - 3 0.27428 9/2 - 4 0.31818 3/2 + 5 0.32171 5/2 + 6 0.41150 1/2 + 7 0.44220 5/2 + 8 0.51870 7/2 + 9 0.52526 5/2 + 10 0.57268 5/2 + 11 0.58853 3/2 + * ------------------------------------ Levels above 0.59853 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /16/ were used ---------------------------------------------------------- Nuclei a* Pair Esh T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV ---------------------------------------------------------- Xe-130 16.030 2.105 0.158 0.675 0.108 7.673 2.544 Xe-129 16.580 1.057 0.970 0.676 -1.490 7.279 0.589 Xe-128 15.820 2.121 1.127 0.604 0.631 6.688 1.430 Xe-127 16.373 1.065 1.792 0.646 -1.332 6.940 0.530 I -129 15.256 1.057 -0.097 0.711 -0.934 6.797 1.204 I -128 16.654 0.000 0.643 0.666 -2.328 5.906 0.345 I -127 15.054 1.065 1.076 0.698 -1.170 7.021 0.375 Te-127 18.544 1.065 0.107 0.594 -0.817 6.052 0.764 Te-126 16.022 2.138 0.369 0.688 -0.104 8.045 2.182 Te-125 17.306 1.073 1.254 0.571 -0.575 5.652 1.089 ---------------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Generalized Lorentzian (GLO) /17/ 6. Preequilibrium process Preequilibrium is on for n, p, d, t, He-3, and alpha. Preequilibrium capture is on. References 1) Ribon, P. et al.: CEA-N-1149 (1969). 2) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I, Part A", Academic Press (1981). 3) Skoy, V.R. et al.: Nucl. Instrum. Meth. Phys. Res., B267, 2351 (2009). 4) Lucas, M. et al.: 77Paris, 1, 431 (1977). 5) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 6) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 7) E.Soukhovitski et al., JAERI-Data/Code 2005-002 (2005). 8) Reifarth et al., Phys. Rev. C66, 064603 (2002). 9) J.Raynal, CEA Saclay report, CEA-N-2772 (1994). 10) S.Raman et al., At. Data and Nucl. Data Tables 78, 1 (1995) 11) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007). 12) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 13) Bojowald et al., Phys. Rev. C 38, 1153 (1988). 14) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 15) D.G.Madland, NEANDC-245 (1988), p. 103. 16) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 17) M.Brink, Ph.D thesis, Oxford University, 1955.