53-I -127 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20091112 ----JENDL-4.0 MATERIAL 5325 -----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/. 93-09 JENDL-3.2 was made by JNDC FPND W.G. ***** modified parts for JENDL-3.2 ******************** (2,151) Upper boundary of resolved resonance region was changed from 4.252 keV to 2 keV. *********************************************************** 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 5.2 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 -39.25 eV so as to reproduce the the thermal capture cross section of 6.40+-0.29 b measured by Katoh et al./4/ Unresolved resonance region : 5.2 keV - 100 keV The parameters were determined to reproduce the total and capture cross sections calculated with CASTHY /5/. The parameters should be used only for self-shielding calculation.The effective scattering Thermal cross sections and resonance integrals at 300 K ---------------------------------------------------------- 0.0253 eV res. integ. (*) (barns) (barns) ---------------------------------------------------------- Total 9.6571E+00 Elastic 3.2545E+00 n,gamma 6.4026E+00 1.5391E+02 ---------------------------------------------------------- (*) Integrated from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections Below 5.2 keV, resonance parameters were given. Above 5.2 keV, the spherical optical and statistical model calculation was performed with CASTHY/5/, by taking account of competing reactions, of which cross sections were calculated with PEGASUS/6/ 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/7/. The OMP's for charged particles are as follows: proton = Perey/8/ alpha = Huizenga and Igo/9/ deuteron = Lohr and Haeberli/10/ helium-3 and triton = Becchetti and Greenlees/11/ Parameters for the composite level density formula of Gilbert and Cameron/12/ were evaluated by Iijima et al./13/ 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 /14/. 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./15/ no. energy(MeV) spin-parity gr. 0.0 5/2 + 1 0.0576 7/2 + 2 0.2028 3/2 + 3 0.3750 1/2 + 4 0.4179 5/2 + 5 0.6184 3/2 + 6 0.6286 7/2 + 7 0.6510 9/2 + 8 0.7165 11/2 + 9 0.7446 9/2 + 10 0.9910 3/2 + Levels above 1.1 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/16/ and normalized to 1 milli-barn at 14 MeV. The gamma-ray strength function (8.29e-03) was adjusted to reproduce the capture cross section of 760 milli-barns at 25 keV measured by Yamamuro et al./17/ 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 =106 (n,he3) 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 (= 185.0) 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) 1800.00 mb (recommended by Bychkov+/19/) (n,p) 16.00 mb (recommended by Forrest/20/) (n,alpha) 1.50 mb (recommended by 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 SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING --------------------------------------------------------------- 51-SB-123 1.585E+01 6.213E-01 1.285E+00 5.469E+00 1.430E+00 51-SB-124 1.696E+01 5.600E-01 1.090E+01 3.433E+00 0.0 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 52-TE-124 1.784E+01 6.740E-01 1.452E+00 8.479E+00 2.570E+00 52-TE-125 1.992E+01 5.590E-01 5.035E+00 5.527E+00 1.140E+00 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 53-I -125 * 1.789E+01 5.895E-01 2.042E+00 5.696E+00 1.430E+00 53-I -126 * 1.763E+01 5.871E-01 1.981E+01 4.127E+00 0.0 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 --------------------------------------------------------------- syst: * = ldp's were determined from systematics. 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 7.0 for I -127 and 5.0 for I -128. 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.: J. Nucl. Sci. Technol., 29, 195 (1992). 3) Noguere G. et al.: Phys. Rev., C74, 054602 (2006). 4) Katoh T. et al.: J. Nucl. Sci. Technol., 36, 223 (1999). 5) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991). 6) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987). 7) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77 (1983). 8) Perey, F.G: Phys. Rev. 131, 745 (1963). 9) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962). 10) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974). 11) 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). 12) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446 (1965). 13) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984). 14) Gruppelaar, H.: ECN-13 (1977). 15) Matsumoto, J., et al.: JAERI-M 7734 (1978). 16) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 17) Yamamuro, N., et al.: J. Nucl. Sci. Technol., 17, 582 (1980). 18) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 19) Bychkov, V.M. et al.: INDC(CCP)-146/LJ (1980). 20) Forrest, R.A.: AERE-R 12419 (1986).