53-I -129 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20091112 ----JENDL-4.0 MATERIAL 5331 -----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 84-10 Evaluation for JENDL-2 was made by JNDC FPND W.G./1/ 90-03 Modification for JENDL-3 was made/2/. 09-09 The resolved resonance parameters were taken from the work of Noguere et al./3/ with a modification. The total cross section was recalculated 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 Resolved resonance region (RM formula): below 5.1 keV The present evaluation is based on the JEFF-3.1 data obtained by Noguere et al./3/ The energy of a negative resonance was changed to -177.1 eV so as to reproduce the the thermal capture cross section of 30.3+-1.2 b measured by Nakamura et al./4/ Unresolved resonance region : 5.1 keV - 100 keV The parameters were adjusted to reproduce the capture cross section measured by Macklin /5/ and the total cross section calculated with CASTHY /6/. The 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 3.4654E+01 Elastic 4.3365E+00 n,gamma 3.0317E+01 3.3250E+01 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections Below 5.1 keV, resonance parameters were given. Above 5.1 keV, the spherical optical and statistical model calculation was performed with CASTHY/6/, by taking account of competing reactions, of which cross sections were calculated with PEGASUS/7/ 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, changed from r0 and rso of Iijima and Kawai/8/. The OMP's for charged particles are as follows: proton = Perey/9/ alpha = Huizenga and Igo/10/ deuteron = Lohr and Haeberli/11/ helium-3 and triton = Becchetti and Greenlees/12/ Parameters for the composite level density formula of Gilbert and Cameron/13/ were evaluated by Iijima et al./14/ 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 /15/. 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 taken from Ref./16/ no. energy(MeV) spin-parity gr. 0.0 7/2 + 1 0.0278 5/2 + 2 0.2784 3/2 + 3 0.4874 5/2 + 4 0.5596 1/2 + 5 0.6960 11/2 + 6 0.7296 9/2 + 7 0.7689 7/2 + 8 0.8299 3/2 + 9 0.8450 7/2 + 10 1.0470 3/2 + 11 1.0504 7/2 + 12 1.1117 5/2 + 13 1.2100 1/2 + 14 1.2608 5/2 + 15 1.2821 3/2 + 16 1.2922 1/2 + 17 1.4016 9/2 + 18 1.4835 1/2 + Levels above 1.55 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/17/ and normalized to 1 milli-barn at 14 MeV. The gamma-ray strength function (5.13e-03) was adjusted to reproduce the capture cross section of 215 milli-barns at 100 keV measured by Macklin./5/ 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 (= 221.7) was estimated by the formula derived from Kikuchi-Kawai's formalism/18/ 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) 1500.00 mb (systematics of Wen Den Lu+/19/) (n,p) 3.64 mb (systematics of Forrest/20/) (n,alpha) 1.86 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 from 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-125 1.700E+01 5.120E-01 7.883E-01 3.792E+00 1.090E+00 51-SB-126 1.700E+01 5.250E-01 7.566E+00 2.897E+00 0.0 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 52-TE-126 1.706E+01 6.100E-01 5.154E-01 6.554E+00 2.230E+00 52-TE-127 2.004E+01 5.380E-01 3.633E+00 5.165E+00 1.140E+00 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 53-I -127 1.717E+01 6.263E-01 4.458E+00 5.757E+00 1.090E+00 53-I -128 1.715E+01 6.200E-01 2.329E+01 4.542E+00 0.0 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 --------------------------------------------------------------- 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 5.277 for I -129 and 5.0 for I -130. References 1) Aoki, T. et al.: Proc. Int. Conf. on Nuclear Data for Basic and Applied Science, Santa Fe., Vol. 2, p.1627 (1985). 2) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science and Technology, Mito, p. 569 (1988). 3) Noguere G. et al.: Phys. Rev., C74, 054602 (2006). 4) Nakamura S. et al.: J. Nucl. Sci. Technol., 33, 283 (1996). 5) Macklin, R.L.: Nucl. Sci. Eng., 85, 350 (1983). 6) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975). 7) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987). 8) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77 (1983). 9) Perey, F.G: Phys. Rev. 131, 745 (1963). 10) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962). 11) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974). 12) 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). 13) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446 (1965). 14) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984). 15) Gruppelaar, H.: ECN-13 (1977). 16) Matsumoto, J., et al.: JAERI-M 7734 (1978). 17) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 18) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 19) Wen Den Lu and Fink, R.W.: Phys. Rev., C4, 1173 (1971). 20) Forrest, R.A.: AERE-R 12419 (1986).