97-BK-247 JAERI EVAL-JUN95 T.NAKAGAWA AND T.LIU
JAERI-RESEARCH 97-056 DIST-MAR02 20000911
----JENDL-3.3 MATERIAL 9746
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
95-06 NEW EVALUATION FOR JENDL ACTINIDE FILE WAS MADE BY
T.NAKAGAWA AND T.LIU /1/.
99-12 RECOMPILED BY T.NAKAGAWA.
THE FOLLOWING QUANTITIES ARE RE-EVALUATED AFTER JAERI-
RESEARCH 97-056:
MF=3 MT=102 DIRECT/SEMI-DIRECT MODIFIED.
MF=4 MT= 2 BELOW 500 KEV, REPLACED WITH CASTHY CALC.
MF=5 MT=16, 17, 18, 91
MF=1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MT=452 NUMBER OF NEUTRONS PER FISSION
SUM OF MT'S =455 AND 456.
MT=455 DELAYED NEUTRON DATA
SEMI-EMPIRICAL FORMULA BY TUTTLE /2/.
MT=456 PROMPT NEUTRON DATA
SEMI-EMPIRICAL FORMULA BY HOWERTON /3/.
MF=2,MT=151 RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (SLBW) : 1.0E-5 TO 150 EV
HYPOTHETICAL RESONANCE LEVELS WERE GIVE. THEIR PARAMETERS
WERE DETERMINED SO AS TO REPRODUCE THERMAL CROSS SECTIONS.
ASSUMED DATA WERE:
S-WAVE NEUTRON STRENGTH FUNCTION = 1.0E-4
AVERAGE LEVEL SPACING = 2.01 EV (FROM LEVEL DENSITY
PARAMETERS)
RADIATIVE WIDTH = 0.026 EV /4/
FISSION WIDTH = 0.013 EV (FROM THE RATIO OF CAPTURE
AND FISSION CROSS SECTIONS
AT THE THERMAL ENERGY)
SCATTERING RADIUS = 9.27 FM (CALCULATED WITH OPTICAL
MODEL)
NO UNRESOLVED RESONANCE PARAMETERS WERE GIVEN.
CALCULATED 2200 M/S CROSS SECTIONS AND RES. INTEGRAL
2200 M/S RES. INTEGRAL
TOTAL 288.2 B
ELASTIC 12.33 B
FISSION 91.96 B 453 B
CAPTURE 183.9 B 896 B
MF=3 NEUTRON CROSS SECTIONS
CROSS SECTIONS IN THE ENERGY RANGE BELOE 150 EV WERE
REPRESENTED WITH RESONANCE PARAMETERS.
MT=1 TOTAL CROSS SECTION
CASTHY /5/ CALCULATION WAS ADOPTED.
CASTHY CALCULATION
------------------
STATISTICAL MODEL CALCULATION WITH CASTHY CODE /5/ WAS
MADE CONSIDERING COMPETING PROCESSES OF FISSION, (N,2N) AND
(N,3N).
SHERICAL OPTICAL POTENTIAL PARAMETERS /6/
V = 45.036-0.3*EN (MEV)
WS= 4.115+0.4*EN (MEV)
WV= 0 , VSO = 7.5 (MEV)
R = RSO = 1.256 , RS = 1.260 (FM)
A = ASO = 0.626 , B = 0.555+0.0045*EN (FM)
THE LEVEL DENSITY PARAMETERS FOR GILBERT-CAMERON'S FORMULA
/7/
ISOTOPE BK-247 BK-248
A(1/MEV) 28.1 27.8
SPIN-CUTOFF PARA. 30.47 30.39
PAIRING E(MEV) 0.39 0.0
TEMP. (MEV) 0.364 0.326
C(1/MEV) 2.9 10.8
EX(MEV) 7.97 1.85
THE LEVEL SCHEME TAKEN FROM REF. /8/.
NO. ENERGY(KEV) SPIN-PARITY
G.S. 0.0000 3/2 -
1. 29.900 5/2 -
2. 40.800 7/2 +
3. 71.600 7/2 -
4. 82.800 9/2 +
5. 125.50 9/2 -
6. 137.00 11/2 +
7. 196.00 13/2 +
8. 265.00 15/2 +
9. 334.90 5/2 +
10. 378.10 7/2 +
11. 447.80 5/2 -
12. 487.00 1/2 +
13. 489.40 7/2 -
14. 518.00 3/2 +
15. 541.00 9/2 -
16. 587.00 13/2 +
17. 704.00 1/2 -
18. 743.00 5/2 -
19. 815.00 7/2 -
20. 828.00 9/2 -
21. 904.00 9/2 -
CONTINUUM LEVELS ASSUMED ABOVE 983 KEV.
MT=2 ELASTIC SCATTRING
CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).
MT=4 TOTAL INELASTIC SCATTERING
SUM OF MT=51 TO 91.
MT=16,17,18 (N,2N), (N,3N), FISSION
STAPRE RESULTS CALCULATED BY KONSHIN /9/ WERE ADOPTED.
MT=51,53,55 (N,N') TO 1ST, 3RD AND 5TH LEVELS
CALCULATED WITH ECIS /10/ AND CASTHY /5/ CODES.
IN THE ECIS CALCULATION, CH.LAGRANGE'S DEFORMED OPTICAL
POTENTIAL PARAMETERS /11/ WERE USED.
V = 49.82 - 17*((N-Z)/A) - 0.3*EN (MEV)
WS = 5.52 - 9*((N-Z)/A)+ 0.4*EN (MEV), 0=