98-CF-249 JAERI EVAL-JUL95 T.NAKAGAWA AND T.LIU
DIST-MAR02 REV2-FEB02 20020226
----JENDL-3.3 MATERIAL 9852
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
85-03 EVALUATION FOR JENDL-3 WAS MADE BY Y.KIKUCHI AND
T.NAKAGAWA (JAERI). DETAILS ARE GIVEN IN REF. /1/.
95-07 NEW EVALUATION WAS MADE BY T.NAKAGAWA AND T.LIU.
00-05 MODIFICATION AND COMPILATION WERE MADE BY T.NAKAGAWA
***** Modified parts from JENDL-3.2 *******************
MF=2 Scattering radius in the unresolved resonance
region.
ALL DATA OF MF'S = 3, 4 AND 5.
*******************************************************
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 NUMBER OF PROMPT NEUTRONS PER FISSION
SEMI-EMPIRICAL FORMULA BY HOWERTON /3/.
MF=2,MT=151 RESONANCE PARAMETERS (TAKEN FROM JENDL-3.2)
RESOLVED RESONANCES FOR MLBW FORMULA : 1.0E-5 EV TO 70 EV
RESONANCE ENERGIES, NEUTRON AND FISSION WIDTHS WERE TAKEN
FROM THE EXPERIMENTAL DATA OF BENJAMIN+ /4/. THE RADIATIVE
WIDTH WAS ASSUMED TO BE 0.04 EV ACCORDING TO DABBS+ /5/.
A NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE THERMAL
CROSS SECTIONS. NO BACKGROUND CORRECTION WAS APPLIED.
UNRESOLVED RESONANCES : 70 EV - 30 KEV
OBTAINED FROM OPTICAL MODEL CALCULATION:
S1=3.15E-4, S2=0.83E-4.
ESTIMATED FROM RESOLVED RESONANCES:
DOBS=1.16 EV, GAM-G=40 MILLI-EV ,S0=1.06E-4
FISSION WIDTHS WERE ESTIMATED FROM THE CHANNEL THEORY OF
FISSION /6/. S0, S1 AND S2 VALUES WERE ADJUSTED SO AS TO
REPRODUCE THE FISSION CROSS SECTION MEASURED BY DABBS+ /5/.
Scattering radius of 8.85 fm was determined so as to give the
same ealstic scattering cross section above 30 keV.
CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS
2200 M/S VALUE RES. INT.
TOTAL 2176.7 B -
ELASTIC 6.22 B -
FISSION 1666 B 2220 B
CAPTURE 504.5 B 695 B
MF=3 NEUTRON CROSS SECTIONS
MT=1 TOTAL CROSS SECTION
CALCULATED WITH CASTHY CODE /7/ BASED ON THE SHERICAL
OPTICAL MODEL. THE OPTICAL POTENTIAL OF REF./8/ WERE
USED.
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)
COMPETING PROCESSES OF THE FISSION, (N,2N) AND (N,3N) WERE
TAKEN INTO ACCOUNT. THE FOLLOWING LEVEL DENSITY PARAMETERS
OF GILBERT-CAMERON'S FORMULA /9/ WERE USED.
ISOTOPE CF-249 CF-250
A(1/MEV) 29.4 31.2
SPIN-CUTOFF FACT 31.33 32.36
PAIRING E(MEV) 0.77 1.673
TEMP.(MEV) 0.3693 0.4025
C(1/MEV) 4.644 2.111
EX(MEV) 3.562 5.423
THE LEVEL SCHEME TAKEN FROM REF. /10/.
NO. ENERGY(KEV) SPIN-PARITY
G.S. 0 9/2 -
1. 62.49 11/2 -
2. 136.2 13/2 -
3. 144.96 5/2 +
4. 187.94 7/2 +
5. 220.0 15/2 -
6. 243.07 9/2 +
7. 315.0 17/2 -
8. 315.1 11/2 +
9. 379.52 7/2 +
10. 384.0 13/2 +
11. 416.8 1/2 +
12. 425.0 19/2 -
13. 437.56 9/2 +
14. 440.0 3/2 +
15. 442.98 7/2 +
16. 460.0 5/2 +
17. 500.7 9/2 +
18. 550.0 1/2 +
19. 606.0 5/2 +
20. 668.0 13/2 -
21. 751.0 15/2 -
22. 813.20 5/2 -
23. 852.19 7/2 -
24. 902.5 9/2 -
25. 920.0 11/2 +
26. 962.0 11/2 -
27. 992.0 13/2 +
28. 1008.0 9/2 +
CONTINUUM LEVELS ASSUMED ABOVE 1031. KEV.
MT= 2 ELASTIC SCATTERING
CALCULATED AS TOTAL - PARTIAL CROSS SECTIONS.
MT= 4 TOTAL INELASTIC SCATTERING
SUM OF MT=51 to 78 AND 91.
MT=16,17 (N,2N), (N,3N) CROSS SECTIONS
STAPRE RESULTS CALCULATED BY KONSHIN /11/ were adopted.
MT=18 FISSION CROSS SECTION
DATA WERE TAKEN FROM JENDL-3.2 WHICH WAS EVALUATED ON THE
BASIS OF THE MEASURED DATA BY DABBS+ /5/, SILBERT/12/
AND KUPRIYANOV+ /13/.
MT=51, 52, 55
CALCULATED WITH ECIS /14/ AND CASTHY /7/ CODES.
LAGRANGE'S DEFORMED OPTICAL POTENTIAL PARAMETERS /15/
WERE USED.
V = 49.82 - 17*((N-Z)/A) - 0.3*EN (MEV)
WS = 5.52 - 9*((N-Z)/A)+ 0.4*EN (MEV) EN=< 10 MEV
= 9.52 - 9*((N-Z)/A) (MEV) 10 =