6-C - 12
6-C - 12 JAERI EVAL-AUG83 K.SHIBATA
JAERI-M 83-221 DIST-SEP89 REV2-DEC93
----JENDL-3.2 MATERIAL 625
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
83-08 NEWLY EVALUATED BY K.SHIBATA
DETAILS OF THE EVALUATION ARE GIVEN IN REF./1/.
84-07 DATA OF MF=4 MT=91 WERE REVISED.
COMMENT WAS ALSO MODIFIED.
85-02 DATA OF MT=2, 3, 4, 53 OF MF=3 WERE REVISED ABOVE 10.45
MEV. ANGULAR DISTRIBUTIONS FOR MT=52, 53 WERE ALSO
REVISED.
88-07 DATA OF MT=1, 3, 4, 52 OF MF=3 WERE REVISED ABOVE 8.3 MEV.
93-12 JENDL-3.2
INELASTIC SCATTERING AND CAPTURE CROSS SECTIONS WERE
REEVALUATED BY K. SHIBATA (JAERI).
PSEUDO LEVELS WERE GENERATED TO REPRODUCE VAILABLE DDX
DATA.
THE TOTAL CROSS SECTION WAS REPLACED WITH THE R-MATRIX
CALCULATION DONE IN REF./1/.
ALL DATA WERE COMPILED BY K. SHIBATA.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(3,1) R-MATRIX CALCULTION/1/.
(3,2) TOTAL - NOELASTIC
(3,3) SUM OF PARTIAL REACTION CROSS SECTIONS
(3,4) SUM OF (3,51-91)
(3,51) MODIFIED BY CONSIDERING EXPERIMENTAL DATA.
(3,53),(3,58)
COUPLED-CHANNEL STATISTICAL MODEL CAL.
(3,52),(3,54-57),(3,59-75)
PSEUDO LEVELS.
(3,91) 4-BODY BREAKUP.
(3,102) MODIFIED BY TAKING ACCOUNT OF P-WAVE CAPTURE.
(4,51-91)
(5,91) 4-BODY PHASE SPACE
(12,102) EXPERIMENTAL DATA FOR 20-200 KEV.
********************************************************
MF=1 GENERAL INFORMATION
MT=451 DESCRIPTIVE DATA
MF=2 RESONANCE PARAMETERS
MT=151 SCATTERING RADIUS ONLY.
MF=3 CROSS SECTIONS
CALCULATED 2200M/S CROSS SECTIONS AND RES. INTEGRALS
2200M/S (B) RES.INTEG. (B)
TOTAL 4.750 -
ELASTIC 4.746 -
CAPTURE 0.0035 0.0018
MT=1 SIG-T
BELOW 10 EV, SUM OF SIG-EL AND SIG-CAP.
BETWEEN 10 EV AND 4.8 MEV, THE CROSS SECTION WAS CALCU-
LATED ON THE BASIS OF THE R-MATRIX THEORY. THE R-MATRIX
PARAMETERS WERE OBTAINED SO AS TO GIVE THE BEST FIT TO
THE EXPERIMENTAL DATA /2/-/7/.
ABOVE 4.8 MEV, BASED ON THE MEASUREMENTS /8/-/10/.
MT=2 SIG-EL
BELOW 10 EV, SIG-EL = 4.746 BARNS.
ABOVE 10 EV, THE CROSS SECTION WAS OBTAINED BY SUBTRACTING
THE REACTION CROSS SECTION FROM THE TOTAL CROSS SECTION.
MT=3 NON-ELASTIC
SUM OF MT=4, 102, 103, 104 AND 107.
MT=4 TOTAL INELASTIC
SUM OF MT=51-75 AND 91.
MT=51 SIG-IN 4.44 MEV LEVEL
BASED ON THE EXPERIMENTAL DATA /11,27,30,31/.
MT=53,58 SIG-IN 7.65 MEV (0+), 9.64 MEV (3-) LEVELS
THE CROSS SECTIONS WERE OBTAINED FROM COUPLED-CHANNEL
AND STATISTICAL MODEL CALCULATIONS.
MT=52,54-57,59-75 PSEUDO LEVELS (N,N'3ALPHA)
PSEUDO LEVELS WITH AN INTERVAL OF 500 KEV WERE MADE IN
ORDER TO SIMULATE SEQUENTIAL (N,N') DECAY (EVAPORATION
SHAPE) AND 3-BODY BREAKUP (PHASE SPACE) LEADING TO
(N,N'3ALPHA). THE SUM OF THE CROSS SECTIONS FOR PSEUDO
LEVELS AND MT=91 IS CONSISTENT WITH THE MEASUREMENT/12/
EXCEPT AROUND THE THRESHOLD ENERGY WHERE THE CALCULATED
CROSS SECTIONS WERE ENHANCED.
MT=91 (N,N'3ALPHA)
CONTRIBUTION FROM 4-BODY BREAKUP. THE CROSS SECTION
WAS ADJUSTED SO THAT THE CALCULATED SPECTRUM COULD GIVE
A GOOD FIT TO EXPERIMENTAL DATA AT 14 MEV.
TOTAL (N,N')3A CROSS SECTION IS THE SUM OF MT=52-75
AND 91.
MT=102 CAPTURE
BELOW 100 EV, 1/V CURVE.
BETWEEN 100 EV AND 5 MEV, S-WAVE PLUS P-WAVE CAPTURE
BY CONSIDERING THE DATA OF IGASHIRA/32/.
ABOVE 5 MEV, THE INVERSE REACTION DATA OF COOK /13/ WERE
ADDED.
MT=103 (N,P)
BASED ON THE MEASUREMENT OF RIMMER AND FISHER /14/.
MT=104 (N,D)
CALCULATED WITH DWBA.
MT=107 (N,A)
BASED ON THE EXPERIMENTAL DATA /15/-/23/.
MT=251 MU-BAR
CALCULATED FROM THE DATA IN FILE4.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2
BELOW 10 EV, ISOTROPIC IN THE CENTER-OF-MASS SYSTEM (CM).
BETWEEN 10 EV AND 4.8 MEV, CALCULATED WITH THE R-MATRIX
THEORY.
ABOVE 4.8 MEV, BASED ON THE EXPERIMENTAL DATA /24/-/28/.
MT=51
BASED ON THE EXPERIMENTAL DATA /24/-/28//33/.
MT=53, 58
BASED ON THE EXPERIMENTAL DATA /33/.
MT=52,54-57,59-75
ISOTROPIC IN CM.
MT=91
ISOTROPIC DISTRIBUTIONS IN LAB.
MF=5 ENERGY DISTRIBUTION OF SECONDARY NEUTRONS
MT=91
4-BODY PHASE SPACE.
MF=12 PHOTON-PRODUCTION MULTIPLICITIES
MT=51 (N,N')GAMMA
M=1.0
MT=102 (N,GAMMA)
BASED ON THE MEASUREMENT OF SPILLING ET AL./29/ AND
OF IGASHIRA /32/.
MF=14 PHOTON ANGULAR DISTRIBUTIONS
MT=51
BASED ON THE EXPERIMENTAL DATA OF MORGAN ET AL./11/.
MT=102
ASSUMED TO BE ISOTROPIC.
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