54-Xe-131 JAEA EVAL-FEB22 S.Kunieda, A.Ichihara, K.Shibata+ DIST-DEC21 20100316 ----JENDL-5 MATERIAL 5446 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT History 09-11 Re-evaluation was performed for JENDL-4.0 10-03 Compiled by S.Kunieda 21-11 revised by O.Iwamoto (MF8/MT4,16,17,22,28,32,41,102-104,107) JENDL/AD-2017 adopted (MF8/MT105,106) added (MF10/MT4,17,22,28,104) JENDL/AD-2017 based 21-11 above 20 MeV, JENDL/ImPACT-2018 merged by O.Iwamoto 21-11 (MF6/MT5) recoil spectrum added by O.Iwamoto 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 2.25 keV Resonance parameters of JENDL-3.3 were mainly based on the data measured by Ribon et al./1/. The neutron orbital angular momentum l was assumed to be 0 for all the 40 resonance levels up to 4 keV. The neutron widths of the 40 levels were derived from the g*(neutron width) data measured by Ribon et al. However, the value of total spin j for each resonance level was unknown except 24 levels assigned by Ribon et al. In JENDL-3.3, the total spin j of 16 resonance levels was tentatively estimated with a random number method. The radiation widths of 24 resonance levels were given by Ribon et al.; those of 6 levels were obtained from the difference between total and neutron widths. For the remaining 10 levels, the weighted average radiation width of 111.94 meV was derived from the above 24 radiation widths, and was assigned to them. A negative resonance level was added at -84 eV so as to reproduce the thermal capture cross section of 85+-10 barns given by Mughabghab et al./2/ The scattering radius was also taken from the graph (fig. 1, Part A) given by Mughabghab et al. In JENDL-4, the values of total spin j at 49.508 eV, 992.98 eV, 1884.6 eV, and 2082.7 eV were changed in order to keep the consistency among the neutron, radiation, and total widths. With the change of the j-values, the widths at some resonance levels were modified. The weighted average value of radiation widths was also slightly modified from 111.94 eV to 111.84 eV. The data of p-wave resonance measured at 3.2 eV by Skoy et al./3/ were compiled in this edition. Moreover, the parameters at 14.41 eV were replaced with those at 14.47 eV obtained by Skoy et al./4/ The negative resonance level was modified so as to reproduce the thermal capture cross section of 100+-6 barns at 0.0253 eV measured by lucas et al./5/. - Unresolved resonance region: 3.6 keV - 150 keV The parameters were obtained by fitting to the total and capture cross sections calculated by the POD code /6/. The ASREP code /7/ 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 1.31493E+02 Elastic 3.18080E+01 n,gamma 9.96848E+01 9.09207E+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 /8/ & POD /6/ calculations. MT= 3 Non-elastic cross section Sum of partial non-elastic cross sections. MT= 4,51-91 (n,n') cross section The OPTMAN /8/ & POD /6/ 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 /6/. MT=102 Capture cross section Calculated by the POD code /6/. The value of gamma-ray strength function was set to the recomendation value by Mughabghab /9/. 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 /6/. 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 /6/. 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 /8/ & POD /6/ 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 /6/. MT= 51-90 (n,n') reaction Neutron angular distributions calculated by OPTMAN /8/ & POD /6/. MT= 91 (n,n') reaction Neutron spectra calculated by the POD code /6/. 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 /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 by the 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 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 /8/ was employed for neutrons, while the ECIS code /10/ 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./11/ OMP : Coupled-channel optical potential /12/ was applied. Protons: Model: Spherical OMP : Koning and Delaroche /13/ Deuterons: Model: Spherical OMP : Bojowald et al. /14/ Tritons: Mode: Spherical OMP : Becchetti and Greenlees /15/ He-3: Model: Spherical OMP : Becchetti and Greenlees /15/ Alphas: Model: Spherical OMP : A simplified folding model potential /16/ (The nucleon OMP was taken from Ref./12/.) 3. Level scheme of Xe-131 ------------------------------------ No. Ex(MeV) J PI CC ------------------------------------ 0 0.00000 3/2 + * 1 0.08019 1/2 + 2 0.16393 11/2 - 3 0.34114 9/2 - 4 0.36449 5/2 + * 5 0.40481 3/2 + 6 0.56519 1/2 + 7 0.63699 7/2 + 8 0.66693 7/2 - 9 0.69990 3/2 + ------------------------------------ Levels above 0.70990 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /17/ were used ---------------------------------------------------------- Nuclei a* Pair Esh T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV ---------------------------------------------------------- Xe-132 16.240 2.089 -1.146 0.723 0.006 8.026 2.425 Xe-131 16.786 1.048 -0.172 0.686 -1.237 7.025 0.700 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 I -131 15.458 1.048 -1.637 0.769 -1.003 7.186 1.623 I -130 15.945 0.000 -0.675 0.824 -3.544 8.206 0.070 I -129 15.256 1.057 -0.097 0.711 -0.934 6.797 1.204 Te-129 20.892 1.057 -1.456 0.590 -0.837 6.047 0.360 Te-128 15.820 2.121 -0.935 0.757 -0.307 8.631 2.488 Te-127 18.544 1.065 0.107 0.594 -0.817 6.052 0.764 ---------------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Generalized Lorentzian (GLO) /18/ 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. Phys. Rev., C53, 2573 (1996). 4) Skoy, V.R. et al.: Nucl. Instrum. Meth. Phys. Res., B267, 2351 (2009). 5) Lucas, M. et al.: 77Paris, 1, 431 (1977). 6) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 7) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 8) E.Soukhovitski et al., JAERI-Data/Code 2005-002 (2005). 9) S.F.Mughabghab, "Atlas of Neutron Resonances", Elsevier (2006). 10) J.Raynal, CEA Saclay report, CEA-N-2772 (1994). 11) S.Raman et al., At. Data and Nucl. Data Tables 78, 1 (1995) 12) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007). 13) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 14) Bojowald et al., Phys. Rev. C 38, 1153 (1988). 15) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 16) D.G.Madland, NEANDC-245 (1988), p. 103. 17) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 18) M.Brink, Ph.D thesis, Oxford University, 1955.