16-S - 34 FUJI E.C. EVAL-MAY87 H.NAKAMURA DIST-MAY10 20090828 ----JENDL-4.0 MATERIAL 1631 -----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 New optical model calculation was performed by T. Watanabe (khi). Data were compiled by K. Shibata (jaeri). ***** modified parts for JENDL-3.2 ****************** (3,1),(3,4),(3,51-55),(3,91),(3,251),(4,2),(4,51-55) optical and statistical model calculations. (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 - 480 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 2.08 b - - capture 0.22 b 0.101 b /1/ total 2.30 b - - mf=3 Neutron cross sections Below 480keV No background cross section. Above 480 keV. mt=1,2,4,51-55,91,102 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 adjusted to reproduce the following experimental data: mt=1 total - mt=2 elastic cross sections of s-32 mt=4 inelastic - The spherical optical potential parameters : V = 38.0 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 0.3mb at 480 keV based on s-32 capture cross section. The discrete level scheme taken from ref./4/: no. energy(MeV) spin-parity (g.s.) 0.0 0 + 1 2.127 2 + 2 3.304 2 + 3 3.914 0 + 4 4.072 1 + 5 4.115 2 + Continuum levels assumed above 4.5 MeV. The level density parameters of Asano et al./5/ are used. ***** JENDL-3.2 **************************************** mt=1,4,51-55,91,251 Optical and statistical model calculation was performed by using the omp set given as follows: V = 58.83 - 0.5635En (MeV) Ws = 3.609 + 0.1819En (MeV) Vso= 4.199 (MeV) r = 1.306, a = 0.452 (fm) rs = 1.124, b = 0.690 (fm) rso= 1.010, aso= 0.750 (fm). ********************************************************* 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 /6/, without the precompound reaction correction. Transmission coefficients for proton and alpha particle are calculated by using the omp of Becchetti-Greenlees/7/ and Huizenga-Igo/8/, respectively. Level density parameters are based on built-in values. mf=4 Angular distributions of secondary neutrons mt=2 Calculated with optical model (casthy). mt=51-55 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 /9/. mt=102 Multiplicities were calculated by using the casthy code /2/. mt=51-55 Transition probability arrays were given. mf=14 Photon angular distributions mt=16,22,28,51-55,91,102,103,107 Isotropic mf=15 Continuous photon energy spectra mt=16,22,28,103,107 Multiplicities were calculated by using the egnash code /9/. 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) Lederer, C.M. et al.: Table of isotopes. 7th edit. 5) Asano et al.: private communication. 6) Young, P.G. and Arthur, E.D.: LA-6947 (1977). 7) Becchetti, Jr. and Greenlees, G.W.: Polarization phenomena in nuclear reactions, p.682 (1971). 8) Huizenga, Jr. and Igo, G.J.: Nucl. Phys., 29, 462 (1962). 9) Yamamuro, N.: JAERI-M 90-006 (1990).