54-Xe-128 JAEA EVAL-FEB22 S.Kunieda, A.Ichihara, K.Shibata+ DIST-DEC21 20100316 ----JENDL-5 MATERIAL 5437 -----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/MT4,16,17,22,28,32,102-104,107) JENDL/AD-2017 adopted (MF8/MT105,106) added (MF9/MT102,107) JENDL/AD-2017 adopted (MF10/MT16) 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 1.7 keV The parameters were mainly taken from JENDL-3.3. A resona- nce was added at 3441.3 eV. The capture width of a negative resonance was changed to 60.3 meV so as to reproduce the capture cross section recommended by Mughabghab/1/. The JENDL-3.3 evaluations is as follows: ***** JENDL-3.3 evaluation ******************************** Resonance parameters were based on the data given by Mughabghab et al./2/, except neutron width of the 3rd level which was derived from the value of g*(reduced neutron width) estimated on the basis of the systematics of those for neighboring levels. Radiation width of 66 meV for the 1st level was obtained from the total and neutron widths. Average radiation width of 70 meV close to that of the 1st level was adopted for the other levels. Neutron orbital angular momentum l was assumed to be 0 for all resonance levels. A negative resonance was added at -100 eV so as to reproduce the thermal capture cross section given by Mughabghab et al. Scattering radius was taken from the graph (fig. 1, Part A) given in ref./2/. ************************************************************ - Unresolved resonance region: 1.7 keV - 300 keV The parameters were obtained by fitting to the total and capture cross sections calculated by the POD code /3/. The ASREP code /4/ 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 1.62385E+01 Elastic 1.10340E+01 n,gamma 5.20447E+00 1.11142E+01 ---------------------------------------------------------- (*) 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 /5/ & POD /3/ calculations. MT= 3 Non-elastic cross section Sum of partial non-elastic cross sections. MT= 4,51-91 (n,n') cross section The OPTMAN /5/ & POD /3/ 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 /3/. MT=102 Capture cross section Calculated by the POD code /3/. The value of gamma-ray strength function was determined to reproduce experimental capture cross sections measured by Reifarth et al /6/. 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 /3/. 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 /3/. 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 /5/ & POD /3/ 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 /3/. MT= 51-90 (n,n') reaction Neutron angular distributions calculated by OPTMAN /5/ & POD /3/. MT= 91 (n,n') reaction Neutron spectra calculated by the POD code /3/. 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 /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 by the 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 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 /5/ was employed for neutrons, while the ECIS code /7/ 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./8/ OMP : Coupled-channel optical potential /9/ was applied. Protons: Model: Spherical OMP : Koning and Delaroche /10/ Deuterons: Model: Spherical OMP : Bojowald et al. /11/ Tritons: Mode: Spherical OMP : Becchetti and Greenlees /12/ He-3: Model: Spherical OMP : Becchetti and Greenlees /12/ Alphas: Model: Spherical OMP : A simplified folding model potential /13/ (The nucleon OMP was taken from Ref./9/.) 3. Level scheme of Xe-128 ------------------------------------ No. Ex(MeV) J PI CC ------------------------------------ 0 0.00000 0 + * 1 0.44291 2 + * 2 0.96947 2 + 3 1.03315 4 + * 4 1.42956 3 + 5 1.58297 0 + 6 1.60341 4 + 7 1.73704 6 + * 8 1.87732 0 + 9 1.99655 5 + 10 1.99965 2 + 11 2.12706 2 - 12 2.22903 5 - 13 2.25289 4 + 14 2.27285 2 + 15 2.28090 6 - 16 2.36180 1 + 17 2.42108 3 + 18 2.43069 1 + 19 2.44392 4 + 20 2.48251 2 + 21 2.50077 5 - 22 2.51071 2 + 23 2.51254 8 + 24 2.52137 4 - 25 2.55067 2 + 26 2.56478 0 + 27 2.58317 5 - 28 2.59157 1 + 29 2.59858 0 + 30 2.63300 2 + ------------------------------------ Levels above 2.64300 MeV are assumed to be continuous. 4. Level density parameters Energy-dependent parameters of Mengoni-Nakajima /14/ were used ---------------------------------------------------------- Nuclei a* Pair Esh T E0 Ematch Elv_max 1/MeV MeV MeV MeV MeV MeV MeV ---------------------------------------------------------- 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 Xe-126 15.610 2.138 1.767 0.603 0.517 6.851 1.867 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 I -126 15.530 0.000 1.628 0.670 -2.309 5.892 0.146 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 Te-124 15.190 2.155 1.314 0.681 -0.046 7.968 2.521 ---------------------------------------------------------- 5. Gamma-ray strength functions M1, E2: Standard Lorentzian (SLO) E1 : Generalized Lorentzian (GLO) /15/ 6. Preequilibrium process Preequilibrium is on for n, p, d, t, He-3, and alpha. Preequilibrium capture is on. References 1) S.F.Mughabghab, "Atlas of Neutron Resonances", Elsevier (2006). 2) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I, Part A", Academic Press (1981). 3) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007). 4) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 5) E.Soukhovitski et al., JAERI-Data/Code 2005-002 (2005). 6) Reifarth et al., Phys. Rev. C66, 064603 (2002). 7) J.Raynal, CEA Saclay report, CEA-N-2772 (1994). 8) S.Raman et al., At. Data and Nucl. Data Tables 78, 1 (1995) 9) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007). 10) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003). 11) Bojowald et al., Phys. Rev. C 38, 1153 (1988). 12) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization Phenomena in Nuclear Reactions," p.682, The University of Wisconsin Press (1971). 13) D.G.Madland, NEANDC-245 (1988), p. 103. 14) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151 (1994). 15) M.Brink, Ph.D thesis, Oxford University, 1955.