44-Ru-101 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G. DIST-MAY10 20100202 ----JENDL-4.0 MATERIAL 4440 -----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/. 93-10 JENDL-3.2 was made by JNDC FPND W.G. 10-02 Compiled by A.Ichihara. ***** modified parts for JENDL-3.2 ******************** (2,151) Small change in unresolved res. paramters (3,2), (3,4), (3,51-91), (3,102) (4,51-91) Level scheme for inelastic scattering cross sections were replaced. *********************************************************** ***** modified parts for JENDL-4.0 ******************** (2,151) Resolved resonance parameters were revised by T.Nakagawa. *********************************************************** 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 1.06 keV) The data of JENDL-3.3 was adopted, and parameters of a negative resonance were modified so as to repruduce the measured thermal capture cross section of 5.2 +- 0.3 b/3/, and elastic scattering of 6.0 +- 0.5 b/4/. ** comments to JENDL-3.3 ** Resonance parameters of JENDL-2 were modified according to new experimental data. For JENDL-2, parameters were determined from the experimen- tal data of Priesmeyer and Jung/5/ and Popov et al./6/ Values of spin J were based on the data of Coceva et al./7/ A negative resonance was added at -20 eV to reproduce the capture cross section of 3.4+-0.9 barns at 0.0253 eV/8/. Average radiation width of 0.180+-0.022 eV was deduced, and adopted to the levels whose radiation width was unknown. For JENDL-3, parameters of 40 levels were reevaluated on the basis of the new experimental data of Anufriev/9/ for neutron widths. Radiation widths and total spin J of several levels were also revised according to Anufriev's data. Scattering radius was modified to 6.1 fm. Total spin J of some resonances was tentatively estimated with a random number method. Neutron orbital angular momentum L of some resonances was determined with a method of Bollinger and Thomas/10/. Unresolved resonance region : 1.06 keV - 100 keV The parameters were adjusted to reproduce the capture cross section measured by Macklin et al./11,12/ The effective scattering radius was obtained from fitting to the calculated total cross section at 100 keV. The unresolved parameters should be used only for self-shielding calculation. Typical values of the parameters at 70 keV: S0 = 0.59e-4, S1 = 6.10e-4, S2 = 0.54e-4, Sg = 105.e-4, Gg = 0.173 eV, R = 5.062 fm. Thermal cross sections and resonance integrals at 300K (b) ------------------------------------------------------- 0.0253 eV reson. integ.(*) ------------------------------------------------------- total 11.234 elastic 6.002 capture 5.232 101 ------------------------------------------------------- (*) In the energy range from 0.5 eV to 10 MeV. mf = 3 Neutron cross sections Below 100 keV, resonance parameters were given. Above 100 keV, the spherical optical and statistical model calculation was performed with CASTHY/13/, by taking account of competing reactions, of which cross sections were calculated with PEGASUS/14/ 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/15/. The OMP's for charged particles are as follows: proton = Perey/16/ alpha = Huizenga and Igo/17/ deuteron = Lohr and Haeberli/18/ helium-3 and triton = Becchetti and Greenlees/19/ Parameters for the composite level density formula of Gilbert and Cameron/20/ were evaluated by Iijima et al./21/ 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 /22/. 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./23/. no. energy(MeV) spin-parity gs 0.0 5/2 + 1 0.12723 3/2 + 2 0.30685 7/2 + 3 0.31133 5/2 + 4 0.32480 1/2 + 5 0.42230 3/2 + 6 0.52750 11/2 - 7 0.53500 5/2 + 8 0.54508 7/2 + 9 0.59830 5/2 - 10 0.61630 3/2 + 11 0.62300 3/2 + 12 0.62350 1/2 + 13 0.68400 3/2 + 14 0.71800 1/2 - 15 0.72000 9/2 + 16 0.82300 3/2 + 17 0.84278 7/2 + 18 0.90800 1/2 - 19 0.92700 3/2 + 20 0.92872 9/2 + 21 0.93847 7/2 + 22 0.97340 5/2 + 23 1.0012 11/2 + 24 1.0410 3/2 + 25 1.0510 7/2 + 26 1.0980 1/2 + 27 1.1100 1/2 + 28 1.1690 3/2 + Levels above 1.2068 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/24/ and normalized to 1 milli-barn at 14 MeV. The gamma-ray strength function (1.16e-02) was adjusted to reproduce the capture cross section of 500 milli-barns at 100 keV measured by Macklin et al./11,12/ 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 =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 (= 106.5) was estimated by the formula derived from Kikuchi-Kawai's formalism/25/ 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) 24.00 mb (systematics of Forrest/26/) (n,alpha) 6.07 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 = 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 A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING --------------------------------------------------------------- 42-MO- 97 1.517E+01 6.800E-01 2.769E+00 6.036E+00 1.280E+00 42-MO- 98 1.594E+01 6.900E-01 7.358E-01 7.888E+00 2.570E+00 42-MO- 99 1.774E+01 6.200E-01 4.294E+00 6.058E+00 1.280E+00 42-MO-100 1.780E+01 6.000E-01 6.702E-01 6.645E+00 2.220E+00 43-TC- 98 1.659E+01 6.120E-01 1.776E+01 4.176E+00 0.0 43-TC- 99 1.600E+01 6.550E-01 2.973E+00 5.984E+00 1.290E+00 43-TC-100 1.637E+01 5.850E-01 1.189E+01 3.635E+00 0.0 43-TC-101 1.675E+01 6.440E-01 6.361E+00 5.761E+00 9.400E-01 44-RU- 99 1.650E+01 6.570E-01 4.016E+00 6.235E+00 1.280E+00 44-RU-100 1.520E+01 7.200E-01 7.835E-01 8.078E+00 2.570E+00 44-RU-101 1.726E+01 6.700E-01 7.228E+00 6.836E+00 1.280E+00 44-RU-102 1.643E+01 6.550E-01 8.872E-01 7.106E+00 2.220E+00 --------------------------------------------------------------- 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 14.30 for Ru-101 and 7.654 for Ru-102. 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) J.Halperin et al.: ORNL 3832, p.4 (1965). 4) S.F.Mughabghab: "Atlas of Neutron Resonances," Elsevier (2006). 5) H.G.Priesmeyer, H.H.Jung: Atomkernenergie, 19, 111 (1972). 6) Ju.P.Popov et al.: Yad. Fiz., 29, 561 (1979). 7) C.Coceva et al.: Nucl. Phys., A117, 586 (1968). 8) S.F.Mughabghab et al.: "Neutron Cross Sections, Vol. I, Part A", Academic Press (1981). 9) V.A.Anufriev et al.: Atom. Energiya, 58, 279 (1985). 10) L.M.Bollinger, G.E.Thomas: Phys. Rev., 171, 1293 (1968). 11) Macklin, R.L., et al.: "Proc. Specialists' Meeting on Neutron Cross Sections of Fission Products, Bologna 1979", NEANDC(E) 209L, 103. 12) Macklin, R.L., Winters, R.R.: Nucl. Sci. Eng., 78, 110(1981). 13) Igarasi, S. and Fukahori, T. JAERI 1321 (1991). 14) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987). 15) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77 (1983). 16) Perey, F.G: Phys. Rev. 131, 745 (1963). 17) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962). 18) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974). 19) 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). 20) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446 (1965). 21) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984). 22) Gruppelaar, H.: ECN-13 (1977). 23) ENSDF: Evaluated Nuclear Structure Data File (Oct. 1993). 24) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969). 25) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear Reactions", North Holland (1968). 26) Forrest, R.A.: AERE-R 12419 (1986).