89-AC-226 TIT EVAL-AUG88 N.TAKAGI
DIST-SEP89
----JENDL-3.2 MATERIAL 8928
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
88-08 NEW EVALUATION WAS MADE BY N. TAKAGI (TOKYO INSTITUTE OF
TECHNOLOGY, TIT)
MF=1 GENERAL INFORMATION
MT=451 COMMENT AND DICTIONARY
MF=2 RESONANCE PARAMETERS
MT=151 RESONANCE PARAMETERS
NO RESONANCE PARAMETERS WERE GIVEN.
2200-M/S CROSS SECTIONS AND RESONANCE INTEGRALS
2200 M/S VALUE RES. INT.
TOTAL 112.40 B -
ELASTIC 12.40 B -
CAPTURE 100.00 B 1680 B
MF=3 NEUTRON CROSS SECTIONS
MT=1 TOTAL CROSS SECTION
BELOW 0.4 EV, CALCULATED AS SUM OF MT'S = 2 AND 102.
ABOVE 0.4 EV, OPTICAL MODEL CALCULATION WAS MADE WITH
CASTHY/2/. THE POTENTIAL PARAMETERS/3/ USED ARE AS
FOLLOWS,
V = 41.0 - 0.05*EN (MEV)
WS= 6.4 - 0.15*SQRT(EN) (MEV)
WV= 0 , VSO = 7.0 (MEV)
R = RSO = 1.31 , RS = 1.38 (FM)
A = ASO = 0.47 , B = 0.47 (FM)
MT=2 ELASTIC SCATTERING CROSS SECTION
BELOW 0.4 EV, THE CONSTANT CROSS SECTION OF 12.4 BARNS WAS
ASSUMED, WHICH WAS THE SHAPE ELASTIC SCATTERING CROSS
SECTION CALCULATED WITH OPTICAL MODEL. ABOVE THIS ENERGY,
OPTICAL MODEL CALCULATION WAS ADOPTED.
MT=4,51-52,91 INELASTIC SCATTERING CROSS SECTIONS.
CALCULATED WITH OPTICAL AND STATISTICAL MODELS BY MEANS OF
CASTHY/2/. NO EXCITED LEVELS WERE TAKEN INTO CALCULATION,
BECAUSE SPIN OF ALL LEVELS WERE UNKNOWN/4/.
NO ENERGY(KEV) SPIN-PARITY
G.S. 0.0 1 +
LEVELS ABOVE 290 KEV WERE ASSUMED TO BE OVERLAPPING.
THE LEVEL DENSITY PARAMETERS WERE TAKEN FROM REF. 5.
MT=16,17,37 (N,2N), (N,3N) AND (N,4N) REACTION CROSS SECTIONS
CALCULATED WITH EVAPORATION MODEL.
MT=102 CAPTURE CROSS SECTION
ASSUMED TO BE 100 BARNS AT 0.0253 EV, AND IN 1/V FORM
BELOW 0.4 EV. ABOVE 0.4 EV, CALCULATED WITH CASTHY.
THE GAMMA-RAY STRENGTH FUNCTION WAS ESTIMATED FROM
GAMMA-GAMMA = 0.040 EV AND LEVEL SPACING = 0.8 EV.
MT=251 MU-L
CALCULATED WITH CASTHY.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2,91 CALCULATED WITH OPTICAL MODEL.
MT=16,17,37 ISOTROPIC IN THE LAB SYSTEM.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16,17,37,91 EVAPORATION SPECTRA
OBTAINED FROM LEVEL DENSITY PARAMETERS.
REFERENCES
1) HOWERTON R.J.: NUCL. SCI. ENG., 62, 438 (1977).
2) IGARASI S.: J.NUCL.SCI.TECHNOL.,12,67 (1975).
3) OHSAWA T., OHTA M.: J. NUCL. SCI. TECHNOL., 18, 408 (1981).
4) ELLIS-AKOVALI Y.A.: NUC;. DATA SHEETS, 50, 229 (1987).
5) GILBERT A., CAMERON A.G.W.: CAN. J. PHYS., 43, 1446 (1965).