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96-Cm-247 JAERI EVAL-MAR89 T.NAKAGAWA, Y.KIKUCHI DIST-JAN09 20090105 ----JEFF-311 MATERIAL 9646 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT *************************** JEFF-3.1.1 ************************* ** ** ** Original data taken from: JEFF-3.1 ** ** ** ****************************************************************** ***************************** JEFF-3.1 ************************* ** ** ** Original data taken from: JEFF-3.0 ** ** ** ****************************************************************** ***************************** JEFF-3.0 *********************** DATA TAKEN FROM :- JENDL-3.2 (DIST-MAR89) JEF-2.2 (MF12-MF15) Set a consistent value of AWR in all MT/MFs Same LNU=1 representation for total and prompt neutrons ****************************************************************** HISTORY 83-03 EVALUATION WAS BY Y.KIKUCHI(JAERI)/REF.1/. 89-03 RE-EVALUATION WAS MADE FOR JENDL-3 BY T.NAKAGAWA(JAERI)/2/. MF=1 GENERAL INFORMATION MT=451 DESCRIPTIVE DATA MT=452 NUMBER OF NEUTRONS PER FISSION SUM OF MT=455 AND MT=456. MT=455 NUMBER OF DELAYED NEUTRONS PER FISSION SEMI-EMPIRICAL FORMULA BY TUTTLE /3/. MT=456 NUMBER OF PROMPT NEUTRONS PER FISSION THERMAL VALUE OF ZHURAVLEV ET AL./4/ AND ENERGY DEPENDENT TERM OF HOWERTON /5/. MF=2 RESONANCE PARAMETERS MT=151 RESONANCE PARAMETERS RESOLVED RESONANCE REGION (MLBW) : 1.0E-5 TO 60 EV EVALUATION WAS BASED ON THE EXPERIMENTAL DATA OF MOORE AND KEYWORTH /6/ AND BELANOVA ET AL./7/. THE PARAMETERS OF 1.25-EV LEVEL WERE TAKEN FROM MUGHAGGHAB /8/. RADIATIVE WIDTHS = 0.040 EV WAS ASSUMED. SCATTERING RADIUS = 9.14 FM. A NEGATIVE RESONANCE WAS ADDED AT -0.3 EV. UNRESOLVED RESONANCE REGION : 60 EV TO 30 KEV PARAMETERS WERE DETERMINED WITH A FITTING CODE ASREP/9/ SO AS TO REPRODUCE THE FISSION CROSS SECTION OF MOORE AND KEYWORTH /6/, AND THE TOTAL AND CAPTURE CROSS SECTIONS CALCULATED WITH OPTICAL AND STATISTICAL MODELS. ENERGY INDEPENDENT PARAMETERS: R=9.386 FM, S2=0.86E-4, WG=0.04 EV,. WF(4-)=0.0534 EV, WF(5-)=0.5 EV, WF(3+)=0.08 EV, WF(4+)=0.68 EV, WF(5+)=0.05 EV, WF(6+)=0.47 EV. WF ESTIMATED BY SYSTEMATIC SURVEY /10/ ENERGY DEPENDENT PARAMETERS AT 0.9 KEV: S0=0.774E-4, S1=2.89E-4, D=1.397 EV. CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS 2200 M/SEC RES. INTEG. TOTAL 147.8 B - ELASTIC 8.775 B - FISSION 81.79 B 612 B CAPTURE 57.20 B 535 B MF=3 NEUTRON CROSS SECTIONS BELOW 30 KEV, CROSS SECTIONS WERE REPRESENTED WITH RESONANCE PARAMETERS. MT=1,2,4,51-60,91,102,251 TOTAL, ELASTIC AND INELASTIC SCATTERING, CAPTURE CROSS SECTIONS AND MU-L CALCULATED WITH OPTICAL AND STATISTICAL MODEL CODE CASTHY/11/. THE SPHERICAL OPTICAL POTENTIAL PARAMETERS (MEV,FM): V =43.4-0.107*EN, R =1.282, A =0.60 WS =6.95-0.339*EN+0.0531*EN**2, RS =1.29, B =0.50 (DERIVATIVE WOODS-SAXON FORM) VSO=7.0, RSO=1.282, ASO=0.60 THIS SET OF POTENTIAL PARAMETERS WAS DETERMINED /12/ TO REPRODUCE WELL THE TOTAL CROSS SECTION OF AM-241 BY PHILLIPS AND HOWE /13/. IN THE STATISTICAL MODEL CALCULATION, COMPETING PROCESSES OF FISSION, (N,2N), (N,3N) AND (N,4N), AND LEVEL FLUCTUATION WERE CONSIDERED. THE LEVEL SCHEME OF CM-247 WAS TAKEN FROM REF./14/. NO. ENERGY(KEV) SPIN-PARITY G.S. 0 9/2 - 1 61.5 11/2 - 2 133 13/2 - 3 227 5/2 + 4 266 7/2 + 5 285 7/2 + 6 317 9/2 + 7 342 9/2 + 8 404 1/2 + 9 433 3/2 + 10 449 5/2 + CONTINUUM LEVELS ASSUMED ABOVE 479 KEV. THE LEVEL DENSITY PARAMETERS WERE TAKEN FROM GILBERT AND CAMERON/15/. THE GAMMA-RAY STRENGTH FUNCTION OF 2.29E-2 WAS DEDUCED FROM RESONANCE PARAMETERS. MT=16,17,37 (N,2N), (N,3N) AND (N,4N) REACTION CROSS SECTIONS CALCULATED WITH EVAPORATION MODEL/16/. MT=18 FISSION EVALUATED ON THE BASIS OF THE MEASURED DATA BY MOORE AND KEYWORTH /6/ BELOW 50 KEV. ABOVE THIS ENERGY, THE DATA OF FOMUSHKIN ET AL./17/ WERE ADOPTED. MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS MT=2,51-60,91 LEGENDRE COEFFICIENTS WERE GIVEN BY THE OPTICAL AND STATISTICAL MODEL CALCULATIONS. MT=16,17,18,37 ISOTROPIC DISTRIBUTIONS IN THE LABORATORY SYSTEM. MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS MT=16,17,37,91 EVAPORATION SPECTRUM MT=18 FISSION SPECTRUM TEMPERATURE OF 1.47 MEV WAS ESTIMATED FROM DATA OF ZHURAVLEV ET AL. /4/. REFERENCES 1) KIKUCHI Y.: JAERI-M 83-236(1984). 2) NAKAGAWA T.: TO BE PUBLISHED AS JAERI-M REPORT. 3) TUTTLE R.J.: INDC(NDS)-107/G+SPECIAL, 29 (1979). 4) ZHURAVLEV K.D. ET AL.: 1973 KIEV, VOL.4, 57 (1973). 5) HOWERTON R.J.: NUCL. SCI. ENG., 62, 438(1977). 6) MOORE M.S. AND KEYWORTH G.A.: PHYS. REV., C3, 1656(1971) 7) BELANOVA T.S. ET AL.: SOV. AT. ENERGY, 47, 772(1979). 8) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL.1, PART B", ACADEMIC PRESS (1984). 9) KIKUCHI Y.: PRIVATE COMMUNICATION. 10) KIKUCHI Y. AND AN S.: J. NUCL. SCI. TECHNOL., 7, 157 (1970). 11) IGARASI S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975). 12) IGARASI S. AND NAKAGAWA T.: JAERI-M 8342 (1979). 13) PHILLIPS T.W. AND HOWE F.R.: NUCL. SCI. ENG., 69, 375(1979). 14) LEDERER C.M. AND SHIRLEY V.S.: TABLE OF ISOTOPES , 7TH ED., (1978). 15) GILBERT A. AND CAMERON A.G.W. : CAN. J. PHYS., 43, 1446(1965). 16) PEARLSTEIN S.: NUCL. SCI. ENG., 23, 238 (1965). 17) FOMUSHKIN E.F. ET AL.: SOV. AT. ENERGY, 62, 340 (1987). ****************************************************************** Relevant comments from JEF-2.2 ------------------------------ * JEF-2 * * DATA WERE TAKEN FROM ENDF/B-V(MAT=8647). * * * BNL,SRL,LLLEVAL-JUL76 KINSEY-ASSEMBLER(SEE COMMENTS) DIST-DEC78 790307 THIS EVALUATION IS IN GENERAL A COMBINATION OF THE SEPTEMBER 1975 EVALUATION OF BENJAMIN AND MCCROSSON AT SRL DOCUMENTED HERE AND THE ENDL EVALUATION OF HOWERTON AT LLL (REF.3). BOTH SOURCES MF=12,13,14,15 PHOTON PRODUCTION DATA FROM LLL EVALUATION WITH RANGES EXTENDED AT BNL TO AGREE WITH MF=3. REFERENCES 1. L.D.GORDEEVA AND G.N.SMIRENKIN,SOV.AT.EN.14(1963)56. 2. F.MANERO AND V.A.KONSHIN,AT.EN.REV.10(1972)646. 3. R.J. HOWERTON, UCRL 50400, VOL 15, PART A (METHODS) SEPT 75 AND PART B (CURVES) APR 76. 4. F.J.MCCROSSON,PROC.CONF.NEUT.CROSS SECTIONS AND TECH., MARCH,1971,KNOXVILLE,TN(1971)714. 5. R.W.BENJAMIN,K.W.MACMURDO,AND J.D.SPENCER,NUCL.SCI.ENG.47 (1972)203. 6. R.W.BENJAMIN,F.J.MCCROSSON,V.D.VANDERVELDE,AND T.C.GORRELL, USERDA REPORT DP-1394(1975). 7. M.S.MOORE AND G.A.KEYWORTH,PHYS.REV.C 3(1971)1656. ******************************************************************Back |