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95-Am-244MJAERI EVAL-MAR88 T.NAKAGAWA JAERI-M 89-008 DIST-JAN09 20090105 ----JEFF-311 MATERIAL 9553 -----INCIDENT NEUTRON DATA ------ENDF-6 FORMAT *************************** JEFF-3.1.1 ************************* ** ** ** Original data taken from: JEFF-3.1 ** ** ** ****************************************************************** ***************************** JEFF-3.1 ************************* ** ** ** Original data taken from: JENDL-3.3 ** ** ** ****************************************************************** =========================================================== 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 88-03 EVALUATED FOR JENDL-3 WAS MADE BY T.NAKAGAWA (JAERI)/1/. MF=1 GENERAL INFORMATION MT=451 COMMENT AND DICTIONARY MT=452 NUMBER OF NEUTRONS PER FISSION SUM OF NU-P (MT=456) AND NU-D (MT=455). MT=455 DELAYED NEUTRON DATA ESTIMATED FROM SEMI-EMPIRICAL FORMULA BY TUTTLE /2/. MT=456 NUMBER OF PROMPT NEUTRONS ESTIMATED FROM SEMI-EMPIRICAL FORMULA BY HOWERTON/3/. MF=2,MT=151 RESONANCE PARAMETERS NO RESONANCE PARAMETERS WERE GIVEN. 2200-M/S CROSS SECTIONS AND RESONANCE INTEGRALS 2200 M/S VALUE RES. INT. TOTAL 2012. B - ELASTIC 11.62 B - FISSION 1600. B 1260 B CAPTURE 400. B 316 B MF=3 NEUTRON CROSS SECTIONS MT=1 TOTAL CROSS SECTION BELOW 0.07 EV, SUM OF PARTIAL CROSS SECTIONS. ABOVE 0.07 EV, CALCULATED WITH OPTICAL AND STATISTICAL MODEL CODE CASTHY/4/. THE SAME OPTICAL POTENTIAL PARAMETERS AS THOSE FOR AM-242 WHICH WERE OBTAINED /5/ BY FITTING THE DATA OF PHILLIPS AND HOWE /6/ FOR AM-241, AND MODIFIED A LITTLE. V = 42.0 - 0.107*EN (MEV) WS= 9.0 - 0.339*EN + 0.0531*EN**2 (MEV) VSO = 7.0 (MEV) R = RSO = 1.282 , RS = 1.29 (FM) A = ASO = 0.60 , B = 0.5 (FM) MT=2 ELASTIC SCATTERING CROSS SECTION CALCULATED WITH CASTHY/4/. MT=4,51-75,91 INELASTIC SCATTERING CROSS SECTIONS CALCULATED WITH CASTHY/4/. THE LEVEL SCHEME WAS TAKEN FROM REF. /7/ AND SHIFTED BY 88 KEV. NO ENERGY(KEV) SPIN-PARITY 1 -88.0 6 - TARGET S. 0.0 1 + 2 12.309 2 + 3 35.281 3 + 4 60.283 4 + 5 87.657 1 - 6 95.511 5 - 7 109.295 2 - 8 140.299 3 - 9 173.696 2 - 10 184.202 4 - 11 201.212 1 - 12 208.658 3 - 13 234.751 5 - 14 247.575 0 - 15 254.650 3 - 16 255.658 4 - 17 260.405 3 + 18 273.838 2 - 19 289.057 0 + 20 302.028 4 + 21 310.743 5 - 22 326.689 2 + 23 330.957 2 + 24 332.131 2 + 25 333.204 3 - LEVELS ABOVE 447 KEV WERE ASSUMED TO BE OVERLAPPING. THE LEVEL DENSITY PARAMETERS WERE DETERMINED ON THE BASIS OF NUMBER OF EXCITED LEVELS/8/ AND RESONANCE LEVEL SPACING/9/. AM-245 AM-244 A(1/MEV) 31.3 30.3 T(MEV) 0.360 0.340 C(1/MEV) 18.06 26.47 E-X(MEV) 3.265 2.373 SPIN-CUTOFF(1/MEV**0.5) 31.98 31.39 PAIRING E(MEV) 0.39 0.0 MT=16,17,37 (N,2N), (N,3N) AND (N,4N) REACTION CROSS SECTIONS CALCULATED WITH EVAPORATION MODEL. MT=18 FISSION CROSS SECTION BELOW 0.07 EV, 1/V SHAPED CROSS SECTION WAS NORMALIZED TO 1600 +- 300 B AT 0.0253 EV/9/. ABOVE 0.07 EV, THE CROSS SECTION WAS ASSUMED TO BE THE SAME AS THAT OF AM-242G (MAT=3952 OF JENDL-3). MT=102 CAPTURE CROSS SECTION BELOW 0.07 EV, 1/V CROSS SECTION WAS NORMALIZED TO 400 B AT 0.0253 EV THAT WAS ESTIMATED BY ASSUMING THE SAME CROSS SECTION RATIO AS HIGHER ENERGY REGION. ABOVE 0.07 EV, CALCULATED WITH CASTHY/4/. THE GAMMA-RAY STRENGTH FUNCTION WAS DETERMINED FROM D-OBS=0.13 EV CALCULATED FROM LEVEL DENSITY PARAMETERS AND WG=0.05 EV. MT=251 MU-L BAR CALCULATED WITH CASTHY/4/. MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS MT=2,51-75,91 LEGENDRE COEFFICIENTS WERE GIVEN BY THE OPTICAL AND STATISTICAL MODEL CALCULATION. 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 WITH NUCLEAR TEMPERATURE CALCULATED FROM LEVEL DENSITIES. MT=18 MAXWELLIAN FISSION SPECTRUM ESTIMATED FROM Z**2/A SYSTEMATICS BY SMITH ET AL./10/. REFERENCES 1) NAKAGAWA T.: JAERI-M 89-008 (1989). 2) TUTTLE R.J.: INDC(NDS)-107/G+SPECIAL , P.29 (1979). 3) HOWERTON R.J.: NUCL. SCI. ENG., 62, 438 (1977). 4) IGARASI S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975). 5) IGARASI S. AND NAKAGAWA T.: JAERI-M 8342 (1979). 6) PHILLIPS T.W. AND HOWE R.E.: NUCL. SCI. ENG., 69, 375 (1979). 7) SHURSHIKOV E.N.: NUCL. DATA SHEETS, 49, 785 (1986). 8) ENSDF, EVALUATED NUCLEAR STRUCTURE DATA FILE (1988). 9) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL. 1, PART B", ACADEMIC PRESS, INC. (1984). 10) SMITH A.B.: ANL/NDM-50 (1979).Back |