44-Ru- 96 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20091203 ----JENDL-4.0 MATERIAL 4425 -----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/ 09-12 JENDL-4.0. Compiled by A.Ichihara (jaea/ndc). ***** modified parts for JENDL-4.0 ******************* (3, 1), (3, 2), (3,102) Thermal cross sections 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 No resolved resonance parameters Unresolved resonance region : 250 eV - 300 keV The neutron strength functions, S0, S1 and S2 were calculated with optical model code CASTHY/2/. 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. The radiation width Gg was based on the systematics of measured values for neighboring nuclides. Typical values of the parameters at 70 keV: S0 = 0.440e-4, S1 = 4.300e-4, S2 = 0.630e-4, Sg = 5.71e-4, Gg = 0.150 eV, R = 6.211 fm. The unresolved resonance parameters were recalculated using the ASREP code/22/. 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 5.307 elastic 5.027 capture 0.2711 6.40 ------------------------------------------------------- (*) In the energy range from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections The capture cross section at 0.0253 eV was determined as 0.271 b on the basis of experimental data of Halperin and Druschel/23/. Cross section shape was assumed to be 1/v below 250 eV so as to reproduce the resonance integral of 6.36 b/3/. The elastic scattering cross section of 5.0 b was estimated by assuming R=6.3 fm. 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 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 dwba cal. gr. 0.0 0 + 1 0.8326 2 + * 2 1.5180 4 + 3 1.9311 2 + 4 2.1487 0 + 5 2.1496 6 + 6 2.2839 2 + 7 2.4621 2 + 8 2.5247 2 + 9 2.5290 2 + 10 2.5762 2 + 11 2.5882 5 - 12 2.6513 2 + 13 2.7399 1 + Levels above 2.76 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/15/. Deformation parameter (beta2 = 0.158) was based on the data compiled by Raman et al./16/ 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 (5.43e-04) was adjusted to reproduce the capture cross section of 315 milli-barns at 25 keV measured by Sriramachandra et al./18/ mt = 16 (n,2n) cross section mt = 22 (n,n'a) cross section mt = 28 (n,n'p) cross section mt = 32 (n,n'd) 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 mt =111 (n,2p) cross section These reaction cross sections were calculated with the preequilibrium and multi-step evaporation model code PEGASUS. The Kalbach's constant k (= 118.0) was estimated by the formula derived from Kikuchi-Kawai's formalism/19/ 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) 150.00 mb (recommended by Forrest/20/) (n,alpha) 31.90 mb (systematics of Forrest/20/) The (n,2n) cross section was determined by eye-guiding of the data measured by Bormann et al./21/ mt = 251 mu-bar Calculated with CASTHY/2/. 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 to 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- 92 1.064E+01 7.770E-01 2.062E-01 5.938E+00 2.210E+00 42-MO- 93 1.125E+01 7.800E-01 9.792E-01 5.457E+00 1.280E+00 42-MO- 94 1.301E+01 6.850E-01 3.417E-01 5.770E+00 2.000E+00 42-MO- 95 1.360E+01 7.150E-01 1.847E+00 5.835E+00 1.280E+00 43-TC- 93 * 9.672E+00 6.989E-01 3.869E-01 3.036E+00 9.300E-01 43-TC- 94 * 1.062E+01 6.915E-01 2.121E+00 2.589E+00 0.0 43-TC- 95 * 1.159E+01 6.842E-01 1.101E+00 3.745E+00 7.200E-01 43-TC- 96 1.741E+01 5.640E-01 1.503E+01 3.650E+00 0.0 44-RU- 94 * 9.776E+00 6.915E-01 6.034E-02 4.294E+00 2.210E+00 44-RU- 95 1.358E+01 6.720E-01 1.120E+00 5.133E+00 1.280E+00 44-RU- 96 1.343E+01 6.680E-01 3.373E-01 5.719E+00 2.000E+00 44-RU- 97 1.510E+01 6.390E-01 1.567E+00 5.300E+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 5.586 for Ru- 96 and 5.0 for Ru- 97. 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) S.F.Mughabghab: "Atlas of Neutron Resonances," Elsevier (2006). 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, 35, 281 (1982). 15) Kunz, P.D.: private communication. 16) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1 (1987) 17) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 18) Sriramachandra Murty, M. et al.: J. Phys. Soc. Japan, 35, 8 (1973). 19) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 20) Forrest, R.A.: AERE-R 12419 (1986). 21) Bormann, M., et al.: Nucl. Phys., A157, 481 (1970) 22) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999) [in Japanese]. 23) J.Halperin, R.E.Druschel: ORNL 3832, p.5 (1965).