44-Ru-104 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20091210 ----JENDL-4.0 MATERIAL 4449 -----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/. 09-12 JENDL-4.0. Compiled by A.Ichihara (jaea/ndc). ***** modified parts for JENDL-4.0 ******************* (2,151) Resolved resonance parameters were revised by T.Nakagawa. (2,151) Unresolved resonance parameters were updated. ********************************************************** mf = 1 General information mt=451 Comments and dictionary mf = 2 Resonance parameters mt=151 Resolved and unresolved resonance parameters Resolved Resonance Region (MLBW; below 11.12 keV) Resonance parameters of JENDL-3.3 were adopted by revising those of the negative resonance so that the thermal capture cross section was in good areement with experimental data of 0.47 b/3,4/. Scattering radius was changed from 6.35 fm to 6.5 fm considering its systematics/5/. ** comments to JENDL-3.3 ** Resonance parameters were taken from JEDL-2 except those of the 1st positive and a negative resonances. Parameters for JENDL-2 were evaluated as follows: Resonance energies below 2 keV were taken from the experimen- tal data by Priesmeyer and Jung/6/ and Shaw et al./7/, other resonances above 2.7 keV were determined from Macklin and Halperin/8/. The neutron widths were evaluated on the basis of the data of Priesmeyer and Jung, and of Macklin and Halperin. The radiation widths of large resonances were taken from Ref./8/ For the others, the average radiation width of 0.103+-0.018 eV was deduced, and adopted to the levels whose radiation width was unknown. Seven hypothetical resonances were generated in the energy range from 2 to 2.7 keV. For the levels observed by Shaw et al. and the hypothetical ones, reduced neutron widths of 12 and 38 meV were given for s-wave and p-wave resonances, respectively. A negative resonance was added at -941 eV so as to reproduce the capture cross section of 0.32+-0.02 barns at 0.0253 eV/9/. For JENDL-3, parameters of the first positive and negative resonances were modified so as to reproduce the resonance integral recommended by Mughabghab et al./9/ Scattering radius was reduced from 6.35 fm to 6.1 fm on the basis of the systematics. Unresolved resonance region : 11.12 keV - 300 keV The neutron strength functions, S0 and S2 were calculated with optical model code CASTHY/10/, and S1 was based on the the compilation of Mughabghab et al./9/ The observed level spacing was determined to reproduce the capture cross section calculated with CASTHY. The effective scattering radius was obtained from fitting to the calculated total cross section at 100 keV. Typical values of the parameters at 70 keV: S0 = 0.450e-4, S1 = 5.700e-4, S2 = 0.530e-4, Sg = 2.95e-4, Gg = 0.110 eV, R = 5.366 fm. The unresolved resonance parameters were calculated using the ASREP code/11/. The parameters should be used only for self-shielding calculation. Thermal cross sections and resonance integrals at 300K (b) ------------------------------------------------------- 0.0253 eV reson. integ.(*) ------------------------------------------------------- total 6.931 elastic 6.462 capture 0.4691 6.62 ------------------------------------------------------- (*) In the energy range from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections Below 11.12 keV, resolved resonance parameters were given. 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/12/ 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 rso of Iijima-Kawai potential/13/. The OMP's for charged particles are as follows: proton = Perey/14/ alpha = Huizenga and Igo/15/ deuteron = Lohr and Haeberli/16/ helium-3 and triton = Becchetti and Greenlees/17/ Parameters for the composite level density formula of Gilbert and Cameron/18/ were evaluated by Iijima et al./19/ 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 /20/. 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./21/. no. energy(MeV) spin-parity dwba cal. gr. 0.0 0 + 1 0.3580 2 + * 2 0.8885 4 + 3 0.8930 2 + 4 0.9881 0 + 5 1.2423 3 + Levels above 1.5 MeV were assumed to be overlapping. For the levels with an asterisk, the contribution of direct inelastic scattering cross sections was calculated by the DWUCK-4 code/22/. Deformation parameter (beta2 = 0.2742) was based on the data compiled by Raman et al./23/ 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/24/ and normalized to 1 milli-barn at 14 MeV. The gamma-ray strength function (2.85e-04) was adjusted to reproduce the capture cross section of 95 milli-barns at 70 keV measured by Macklin et al./25,26/ 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 =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 (= 62.0) was estimated by the formula derived from Kikuchi-Kawai's formalism/27/ and level density parameters. Finally, the (n,p) and (n,alpha) cross sections were normalized to the following values at 14.5 MeV: (n,p) 7.00 mb (recommended by Forrest/28/) (n,alpha) 2.60 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. Contribution of direct inelastic scattering was calculated with DWUCK-4. For other reactions, isotropic distributions 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 = 47.5 R0 = 5.972 A0 = 0.62 WS = 9.74 RS = 6.594 AS = 0.35 VSO= 7.0 RSO= 5.97 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 --------------------------------------------------------------- 42-MO-100 1.780E+01 6.000E-01 6.702E-01 6.645E+00 2.220E+00 42-MO-101 2.085E+01 5.650E-01 7.153E+00 6.092E+00 1.280E+00 42-MO-102 * 1.856E+01 6.452E-01 1.419E+00 8.145E+00 2.520E+00 42-MO-103 2.175E+01 5.300E-01 5.321E+00 5.655E+00 1.280E+00 43-TC-101 1.675E+01 6.440E-01 6.361E+00 5.761E+00 9.400E-01 43-TC-102 1.761E+01 5.400E-01 1.217E+01 3.317E+00 0.0 43-TC-103 1.810E+01 6.310E-01 6.436E+00 6.379E+00 1.240E+00 43-TC-104 1.600E+01 5.500E-01 7.030E+00 2.960E+00 0.0 44-RU-102 1.643E+01 6.550E-01 8.872E-01 7.106E+00 2.220E+00 44-RU-103 1.890E+01 6.480E-01 1.210E+01 7.110E+00 1.280E+00 44-RU-104 1.650E+01 6.780E-01 8.593E-01 7.878E+00 2.520E+00 44-RU-105 2.025E+01 6.060E-01 1.144E+01 6.747E+00 1.280E+00 --------------------------------------------------------------- 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 4.524 for Ru-104 and 5.0 for Ru-105. 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) P.M.Lantz: ORNL 3679, p.11 (1964). 4) R.E.Heft: 1978 MAYAG, p.495 (1978). 5) S.F.Mughabghab: "Atlas of Neutron Resonances," Elsevier (2006). 6) H.G.Priesmeyer, H.H.Jung: Atomkernenergie, 19,111 (1972). 7) R.A.Shaw et al.: Bull. Amer. Phys. Soc., 20, 560 (1975). 8) R.L.Macklin, J.Halperin: Nucl. Sci. Eng., 73, 174 (1980). 9) S.F.Mughabghab et al.: "Neutron Cross Sections, Vol. I, Part A," Academic Press (1981). 10) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975). 11) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 12) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987). 13) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77 (1983). 14) Perey, F.G: Phys. Rev. 131, 745 (1963). 15) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962). 16) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974). 17) 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). 18) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446 (1965). 19) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984). 20) Gruppelaar, H.: ECN-13 (1977). 21) Matsumoto, J., et al.: JAERI-M 7734 (1978). 22) Kunz, P.D.: private communication. 23) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1 (1987) 24) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 25) Macklin, R.L., et al.: Proc. Specialists' Meeting on Neutron Cross Sections of Fission Products, Bologna 1979, NEANDC(E) 209L, 103. 26) Macklin, R.L. and Winters, R.R.: Nucl. Sci. Eng., 78, 110 (1981). 27) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 28) Forrest, R.A.: AERE-R 12419 (1986).