53-I -131 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20091112 ----JENDL-4.0 MATERIAL 5337 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT =========================================================== JENDL-3.2 data were automatically transformed to JENDL-3.3. Interpolation of spectra: 22 (unit base interpolation) (3,251) deleted, T-matrix of (4,2) deleted, and others. =========================================================== History 90-03 New evaluation for JENDL-3 was completed by JNDC FPND W.G./1/ 09-09 The uresolved resonance parameters were recalcualted up to 160 keV. The total cross section was recalcualted from partial cross sections. The data were compiled by K.Shibata (jaea). mf = 1 General information mt=451 Comments and dictionary mf = 2 Resonance parameters mt=151 Resolved and unresolved resonance parameters No resolved resonance parameters Unresolved resonance region : 30 eV - 160 keV The parameters were obtained by fitting to the total and capture cross sections calculated with the CASTHY code /2/. The parameters obtained 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 8.3669E+01 Elastic 3.6146E+00 n,gamma 8.0035E+01 7.7809E+01 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections Below 30 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 taken from Ref./3/, and the scattering cross section was estimated from r = 5.4 fm. Above 30 eV, the spherical optical and statistical model calculation was performed with CASTHY, by taking account of competing reactions, of which cross sections were calculated with PEGASUS/4/ standing on a preequilibrium and multi-step evaporation model. The OMP's for neutron given in Table 1 were determined to reproduce a systematic trend of the total cross section by changing r0 and rso of Iijima-Kawai potential/5/. The OMP's for charged particles are as follows: proton = Perey/6/ alpha = Huizenga and Igo/7/ deuteron = Lohr and Haeberli/8/ helium-3 and triton = Becchetti and Greenlees/9/ Parameters for the composite level density formula of Gilbert and Cameron/10/ were evaluated by Iijima et al./11/ More extensive determination and modification were made in the present work. Table 2 shows the level density parameters used in the present calculation. Energy dependence of spin cut-off parameter in the energy range below E-joint is due to Gruppelaar /12/. mt = 1 Total Spherical optical model calculation was adopted. mt = 2 Elastic scattering Calculated as (total - sum of partial cross sections). mt = 4, 51 - 91 Inelastic scattering Spherical optical and statistical model calculation was adopted. The level scheme was based on Evaluated Nuclear Structure Data File (1987 version)/13/ and Nuclear Data Sheets/14/. no. energy(MeV) spin-parity gr. 0.0 7/2 + 1 0.1497 5/2 + 2 0.4927 3/2 + 3 0.6020 5/2 + 4 0.7737 11/2 + 5 0.8522 9/2 + 6 0.8767 1/2 + 7 1.0058 7/2 + 8 1.0597 9/2 + 9 1.0983 3/2 + 10 1.1469 5/2 + 11 1.1489 7/2 + 12 1.2840 5/2 + 13 1.2982 3/2 + 14 1.3152 9/2 + 15 1.3465 1/2 + Levels above 1.377 MeV were assumed to be overlapping. mt = 102 Capture Spherical optical and statistical model calculation with CASTHY was adopted. Direct and semi-direct capture cross sections were estimated according to the procedure of Benzi and Reffo/15/ and normalized to 1 milli-barn at 14 MeV. The gamma-ray strength function (1.97e-03) was determined from the systematics of radiation width (0.12 eV) and the average s-wave resonance level spacing (60.7 eV) calculated from the level density parameters. mt = 16 (n,2n) cross section mt = 17 (n,3n) cross section mt = 22 (n,n'a) cross section mt = 28 (n,n'p) cross section mt = 32 (n,n'd) cross section mt = 33 (n,n't) cross section mt =103 (n,p) cross section mt =104 (n,d) cross section mt =105 (n,t) cross section mt =107 (n,alpha) cross section These reaction cross sections were calculated with the preequilibrium and multi-step evaporation model code PEGASUS. The Kalbach's constant k (= 274.9) was estimated by the formula derived from Kikuchi-Kawai's formalism/16/ and level density parameters. Finally, the (n,2n), (n,p) and (n,alpha) cross sections were normalized to the following values at 14.5 MeV: (n,2n) 1710.00 mb (systematics of Wen Den Lu+/17/) (n,p) 1.99 mb (systematics of Forrest/18/) (n,alpha) 1.10 mb (systematics of Forrest) mt = 251 mu-bar Calculated with CASTHY. mf = 4 Angular distributions of secondary neutrons Legendre polynomial coefficients for angular distributions are given in the center-of-mass system for mt=2 and discrete inelas- tic levels, and in the laboratory system for mt=91. They were calculated with CASTHY. For other reactions, isotropic distri- butions in the laboratory system were assumed. mf = 5 Energy distributions of secondary neutrons Energy distributions of secondary neutrons were calculated with PEGASUS for inelastic scattering to overlapping levels and for other neutron emitting reactions. TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM) ---------------------- ------------ --------------- V = 45.97-0.199E R0 = 6.481 A0 = 0.62 WS = 6.502 RS = 6.926 AS = 0.35 VSO= 7.0 RSO= 6.49 ASO= 0.62 THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE. TABLE 2 LEVEL DENSITY PARAMETERS NUCLIDE A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING --------------------------------------------------------------- 51-SB-127 1.700E+01 5.120E-01 6.326E-01 3.902E+00 1.200E+00 51-SB-128 1.468E+01 5.600E-01 4.264E+00 2.658E+00 0.0 51-SB-129 1.596E+01 5.040E-01 5.308E-01 3.333E+00 1.040E+00 51-SB-130 1.566E+01 5.000E-01 3.630E+00 2.154E+00 0.0 52-TE-128 1.800E+01 6.090E-01 6.586E-01 7.010E+00 2.340E+00 52-TE-129 2.015E+01 5.350E-01 3.588E+00 5.141E+00 1.140E+00 52-TE-130 1.800E+01 5.470E-01 2.657E-01 5.735E+00 2.180E+00 52-TE-131 1.846E+01 5.360E-01 1.800E+00 4.651E+00 1.140E+00 53-I -129 1.720E+01 6.200E-01 3.436E+00 5.762E+00 1.200E+00 53-I -130 1.640E+01 6.000E-01 1.297E+01 3.896E+00 0.0 53-I -131 1.600E+01 6.330E-01 2.958E+00 5.342E+00 1.040E+00 53-I -132 1.550E+01 6.000E-01 8.595E+00 3.552E+00 0.0 --------------------------------------------------------------- Spin cutoff parameters were calculated as 0.146*sqrt(a)*a**(2/3). In the CASTHY calculation, spin cutoff factors at 0 MeV were assumed to be 6.433 for I -131 and 5.0 for I -132. References 1) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science and Technology, Mito, p. 569 (1988). 2) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975). 3) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I, Part A", Academic Press (1981). 4) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987). 5) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77 (1983). 6) Perey, F.G: Phys. Rev. 131, 745 (1963). 7) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962). 8) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974). 9) Becchetti, F.D., Jr. and Greenlees, G.W.: Polarization Phenomena in Nuclear Reactions ((Eds) H.H. Barshall and W. Haeberli), p. 682, the University of Wisconsin Press. (1971). 10) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446 (1965). 11) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984). 12) Gruppelaar, H.: ECN-13 (1977). 13) ENSDF: Evaluated Nuclear Structure Data File (June 1987). 14) Nuclear Data Sheets, 17, 573 (1976). 15) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 16) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 17) Wen Den Lu and Fink, R.W.: Phys. Rev., C4, 1173 (1971). 18) Forrest, R.A.: AERE-R 12419 (1986).