19-K - 41 FUJI E.C. EVAL-MAY87 H.NAKAMURA DIST-MAY10 20090828 ----JENDL-4.0 MATERIAL 1931 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT =========================================================== The data were taken from JENDL-3.3. =========================================================== HISTORY 87-05 Newly evaluated by H.Nakamura (fuji electric co. ltd.) 94-02 JENDL-3.2 Total cross section was calculated by T. Watanabe (khi). Inelastic scattering cross sections were calculated by K.Shibata (jaeri). Data were compiled by K.Shibata. ***** modified parts for JENDL-3.2 **************************** (3,1),(3,4),(3,51-91),(3,251),(4,2),(4,51-52) new optical and statistical model cal. (3,2) total - nonelastic **************************************************************** 01-04 JENDL-3.3 Gamma-ray production data were evaluated and compiled by K. Shibata ***** modified parts for JENDL-3.3 **************************** (1,451) Updated (3,251) Deleted. (4,2) Transformation matrix deleted. (5,16-91) INT=22. (12,16-107) Added. (14,16-107) Added. (15,16-107) Added. **************************************************************** mf=1 General information mt=451 Descriptive data and dictionary mf=2 mt=151 Resonance parameters: Resolved resonances for MLBW formula: 1.0e-5 eV - 125 keV Parameters are taken from BNL 325 4th edition /1/, and some parameters are assumed to fit the measured data. Cross sections calculated with these parameters are to be corrected by adding mf=3, mt=1, 2 and 102 data. calculated 2200-m/s cross sections and resonance integrals 2200-m/sec res. integ. ref. elastic 2.57 b - - capture 1.46 b 1.58 b /1/ total 4.03 b - - mf=3 Neutron cross sections Below 125 keV No backgroud is given. Above 125 keV. mt=1,2,4,51-,91,102 Total, elastic, inelastic and capture calculated with casthy code /2/, considering the competition with the threshold reaction channels. Optical potential parameters of C.Y.Fu/3/ are used. The spherical optical potential parameters: V = 46.72 Vso= 5.37 (MeV) Ws= 9.13 Wv = 0.0 (MeV) r =rso= 1.26 rs = 1.39 (fm) a =aso= 0.76 b = 0.40 (fm) mt=102 capture data are normalized to the experimental data of 15 mb at 150 keV /4/ . The discrete level scheme taken from ref./5/: no. energy(MeV) spin-parity (g.s.) 0.0 3/2 + 1 0.9804 1/2 + 2 1.294 7/2 - Continuum levels assumed above 1.5 MeV. The level density parameters of Asano et al./6/ are used. ***** JENDL-3.2 ******************************************** The total and inelastic scattering cross sections were cal- culated by using the omp set determined by T. Watanabe. V = 54.36 - 0.325En (MeV) Ws= 2.258 + 0.1698En (MeV) Vso=3.341 (MeV) r =1.20 ,a =0.658 (fm) rs =1.32 ,b =0.602 (fm) rso=1.10 ,aso=0.406 (fm) The cross sections of mt=16,22,28,103,107 in JENDL-3.1 were considered as the competing process for the statistical model calculation. ************************************************************ mt=16(n,2n), 22(n,n'a), 28(n,n'p), 103(n,p), 107(n,a) Based on the statistical model calculations with gnash code /7/, without the precompound reaction correction . Transmission coefficients for proton and alpha particle are calculated by using the omp of Becchetti-Greenlees /8/ and Huizenga-Igo/9/, respectively. Level density parameters are based on built-in values. (n,2n), (n,p) and (n,a) cross sections were normalized to the experimental data of Adam+/10/ for (n,2n), and of Bass+/11/ for (n,p) and (n,a). mf=4 Angular distributions of secondary neutrons mt=2 Calculated with optical model (casthy). mt=51-52 Calculated with Hauser -Feshbach formula (casthy) mt=16,22,28 Isotropic in the laboratory system. mt=91 Isotropic distributions in cm were converted to the distributions in lab. mf=5 Energy distributions of secondary neutrons mt=16,22,28,91,103,107 Evaporation spectra. mf=12 Photon production multiplicities mt=16,22,28,103,107 Multiplicities were calculated by using the egnash code /12/. mt=102 Multiplicities were calculated by using the casthy code /2/. mt=51-52 Transition probability arrays were given. mf=14 Photon angular distributions mt=16,22,28,51-52,91,102,103,107 Isotropic mf=15 Continuous photon energy spectra mt=16,22,28,103,107 Multiplicities were calculated by using the egnash code /12/. mt=102 Multiplicities were calculated by using the casthy code /2/. References 1) Mughabghab, S.F. et al.: Neutron cross section, Vol.1 (1981). 2) Igarasi, S.: J. Nucl. Sci. Tech., 12, 67 (1975). 3) Fu, C.Y.: Atom. Data and Nucl. Data Tables., 17, 127 (1976). 4) Stupegia et al.: J. Nucl. Energ., 22, 267 (1968). 5) Lederer, C.M. et al.: Table of isotopes. 7th edit. 6) Asano et al.: private communication. 7) Young, P.G. and Arthur, E.D.: LA-6947 (1977). 8) Becchetti, Jr. and Greenlees, G.W.: Polarization phenomena in nuclear reactions, p.682 (1971). 9) Huizenga, Jr. and Igo, G.J.: Nucl. Phys., 29, 462 (1962). 10) Adam, A. et al.: Nucl. Phys., A180, 587 (1972). 11) Bass, R.et al.: EANDC(E)-57U, 1 (1965). 12) Yamamuro, N.: JAERI-M 90-006 (1990).