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9.123300+4 2.310380+2 1 1 2 0
0.000000+0 1.000000+0 0 0 0 6
1.000000+0 2.000000+7 0 0 10 31
0.000000+0 0.000000+0 0 0 133 1
91-Pa-233 NEA RCOM-JUN82 SCIENTIFIC CO-ORDINATION GROUP
DIST-MAY05 REV1-MAY05 20050504
----JEFF-31 MATERIAL 9137
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
***************************** JEFF-3.1 *************************
** **
** Original data taken from: JEFF-3.0 **
** **
******************************************************************
***************************** JEFF-3.0 ***********************
DATA TAKEN FROM :- JEF-2.2 (DIST-JAN92)
Components of the energy released by fission (MT=458)
updated by O. Serot et al. (JEF/DOC-887).
Fission Q updated consistently.
******************************************************************
******************************************************************
* JEF-2 *
* DATA WERE TAKEN FROM ENDF/B-V(MAT=1391). *
******************************************************************
* 18-DEC-84: NONELASTIC CROSS SECTION AND RADIOACTIVE DECAY
* DATA DELETED.
* 31-MAR-88: CHANGE OF THE FLAG FROM SINGLE LEVEL TO MULTI LEVEL
* BREIT-WIGNER RESONANCE PARAMETERS.FOR THE SPIN OF
* L=0,RESONANCES HAVE BEEN RANDOMLY ASSIGNED BY THE
* COMPUTER CODE RNDSPIN (H. GRUPPELAAR)
******************************************************************
HEDL,INEL EVAL-MAY78 MANN,SCHENTER,REICH
DIST-MAY79 781102
ENDF/B-V SAME AS EVALUATION OF P.C. YOUNG (JAN70) EXCEPT FOR
DECAY DATA. NO NEW DATA AVAILABLE. (N,G) ADEQUATE.
* * * * * *
DATA MODIFIED OCTOBER 70 TO CONFORM TO ENDF/B-VERSION II FORMATS
* * * * * *
DATA MODIFIED JAN 74 AT GENERAL ATOMIC(DRM) TO USE BNL-325 (ED.3)
RESOLVED RESONANCE PARAMETERS BELOW 18EV. 0.0253EV CAPT XSECT =
41.4605 B.
* * * * * *
DATA MODIFIED MAY 74 AT BROOKHAVEN (BNL) BY R. KINSEY
DECAY DATA ADDED, FILES EXTENDED TO 20 MEV, AND INITIAL POINT
OF THRESHOLD REACTIONS CORRECTED.
* * * * * *
MF=1,MT=451 COMMENTS AND DICTIONARY
MF=1,MT=452 NU(E) BASED ON SYSTEMATICS OF HOWERTON (REF. 11)
MF=1,MT=458 ENERGY OF FISSION BASED ON SYSTEMATICS OF SHER(REF.12)
MF=2,MT=151 RESON PARAMETERS FROM * REF.1(28 RESON,UP TO 17.5EV),
REF.2(12 RESON,17.5-37.5EV). RESOLVED RESON ENERGY RANGE- 0.001
TO 38.5 EV. AVE RESON PARAMETERS DEDUCED FROM THE 27 POSITIVE
RESON GIVEN IN REF.1. UNRESOLVED RESON ENERGY RANGE- 38.5 EV TO
10 KEV. THE 12 GN0 FROM REF.2 ADJUSTED TO YIELD SAME RESON INT
CONTRIB INPLIED BY THE AVE RESON PARAMETERS. THE RESULTING GN0
FOR THE 40 RESOLVED RESON AND THE AVE GN0 FOR THE UNRESOLVED
RESON ADJUSTED TO YIELD A CAPT RESON INT(0.5EV-10MEV)=859.96BN(
INCLUDING THE CONTRIB OF THE MF=3,MT=102 DATA). THE GN0 FOR THE
NEG RESON THEN ADJUSTED TO YIELD A 0.0253EV CAPT XSECT= 39.79BN
FILE 3 CONTAINS SMOOTH DATA IN THE ENERGY RANGE 10 KEV TO 15 MEV
MF=3,MT=1 TOTAL CROSS SECTION - REQUIRED TO BE CONSISTENT IN
BOTH MAGNITUDE AND ENERGY VARIATION WITH THE TOTAL X-SECTION
OF NEIGHBORING NUCLIDES, E.G. TH232,U233,U235,U238, AND PU239.
MF=3,MT=2 ELASTIC SCATTERING CROSS SECTION = TOTAL X-SECTION
MINUS NONELASTIC X-SECTION. IN ADDITION, REQUIRED TO BE CONSIS-
TENT IN ENERGY VARIATION WITH ELASTIC SCATTERING X-SECTION OF
NEIGHBORING NUCLIDES (TH232,U235,U238) AND TO JOIN SMOOTHLY AT
10 KEV WITH A VALUE NEARLY EQUAL TO THE POTENTIAL SCATTERING
X-SECTION (=9.995 BARNS, REF.2).
MF=3,MT=3 NONELASTIC CROSS SECTION = SUM OF THE (N,F),
(N,NPRIME),(N,2N),(N,3N) AND (N,GAMMA) CROSS SECTIONS.
MF=3,MT=4 INELASTIC SCAT XSECT - TAKEN FROM REF.3 . Q-VALUE =
- 18.7 KEV ( ENERGY OF THE FIRST EXCITED STATE IN 91PA233 )
MF=3,MT=16 AND 17 (N,2N) AND (N,3N) XSECT - TAKEN FROM REF.3
Q-VALUE CALCULATED USING ATOMIC MASSES FROM REF.4.
MF=3,MT=18 FISSION CROSS SECTION - COMPOSITE CURVE AS FOLLOWS -
0.48-1.00MEV 233PA(N,F)= 238U(N,F) FROM REF.5.
1.00-1.50MEV LOG(233PA(N,F)) LINEAR IN LOG(E)
1.50-5.00MEV 233PA(N,F)= (C1/C2)*238U(N,F) FROM REF.5.
C1=0.832 = CALC. PLATEAU VALUE OF 233PA(N,F) REF.6.
C2=0.511 = AVG. VALUE OF 238U(N,F) (REF.5),2.6-5.6 MEV
5.00-9.00MEV 233PA(N,F) HAS ENERGY VARIATION SIMILAR TO THAT
FOR (N,F) OF U234,U236 AND NP237 FROM REF.5.
9.00-12.5MEV 233PA(N,F)=(C1/C2)*238U(N,F) FROM REF.7.
C1=1.56 = DERIVED VALUE OF 233PA(N,F) FOR THE SECOND PLATEAU
NEAR 9.0 MEV.
C2=1.02 = 238U(N,F)(REF.7) AT THE SECOND PLATEAU.
12.5-15.0MEV 233PA(N,F) HAS SAME ENERGY VARIATION AS THAT FOR
236U(N,F)(REF.7)
Q-VALUE = CALCULATED ENERGY RELEASE PER FISSION
MF=3,MT=51,52,53,54,55,91 PARTIAL INELASTIC SCAT XSECT-FROM REF.3
MT'S REVISED IN VER. 5, CORRECTING DISCONTINUITY AT 200 KEV 3
MF=3,MT=102 CAPTURE CROSS SECTION - COMPOSITE CURVE AS FOLLOWS -
0.01-0.08MEV 233PA(N,GAMMA) SELECTED TO JOIN SMOOTHLY WITH THE
(N,GAMMA) CALCULATED FROM AVERAGE RESONANCE PARAMETERS
0.08-15.0MEV 233PA(N,GAMMA) = 2*238U(N,GAMMA) FROM REF.8.
NORMALIZATION FACTOR(=2) CHOSEN SO THAT 233PA(N,GAMMA) =
236U(N,GAMMA)(REF.8) AT 0.9 MEV
MF=3,MT=251 MU-BAR (AVG.COSINE OF THE SCATTERING ANGLE IN THE LAB
SYSTEM FOR ELASTIC SCATTERING), CALCULATED FROM THE U(1,M) AND
LEGENDRE COEFFICIENTS GIVEN IN FILE 4
MF=3,MT=252 XI (AVG.LOGARITHMIC ENERGY DECREMENT).
MF=3,MT=253 GAMMA (SLOWING DOWN PARAMETER).
THE ENERGY DEPENDENCE OF THE TWO ABOVE QUANTITIES IS DETERMINED
BY THE LEGENDRE COEFFICIENTS GIVEN IN FILE 4. COMPLETELY
GENERAL EXPRESSIONS IN POWERS OF AWR**-1 HAVE BEEN DERIVED FOR
THE CONSTANTS WHICH DETERMINE THE CONTRIBUTION OF EACH OF THE
LEGENDRE COEFFICIENTS.
MF=4,MT=2 TRANSFER MATRIX U (FROM C.M. TO LAB). A GENERAL EX-
PRESSION FOR U(L,M) IN POWERS OF AWR**-1 HAS BEEN DERIVED. THE
LEGENDRE COEFFICIENTS WERE TAKEN DIRECTLY FROM REF.3, AND ARE
BASED ON THE DATA FOR TH232.
MF=4,MT=51,52,53,54,55 ANG DIST OF NEUTRONS SCAT INELASTICALLY
FROM 5 DISCRETE LEVELS ASSUMED ISOTROPIC IN THE CM SYSTEM
MF=5,MT=16,17,91 ENERGY DEPENDENCE OF SECONDARY NEUTRONS DEFINED
BY AN EVAPORATION SPECTRUM . ENERGY DEPENDENCE OF THETA CALCU-
LATED USING THE FORMULATION IN REF.9
MF=5,MT=18 SIMPLE FISSION SPECTRUM - THETA (CONSTANT) CALCULATED
USING THE FORMULATION GIVEN IN REF.10.
REFERENCES
1. SIMPSON AND CODDING, NUCL SCI AND ENG, 28, 133 (1967)
2. HARRIS D.R. , WAPD-TM-814 (1969)
3. DRAKE AND NICHOLS, GA-7462 (1967)
4. MATTAUCH, ET AL, NUCLEAR PHYSICS, 67, 1 (1965)
5. DAVEY , NUCL SCI AND ENG , 32, 35 (1968)
6. LALOVIC , LECTURES ON NUCL INTERACTIONS, VOL II,207 (1962)
7. HART , AHSB(S) R 169 (1969)
8. STEHN,ET AL, BNL-325, 2ND ED, SUPPL 2 , VOL III (1965)
9. SMITH AND GRIMESEY, IN-1182 (1969)
10.TERRELL, PHYS AND CHEM OF FISS, VOL II, 3 (1965)
11.R.J. HOWERTON, NUCL. SCI. AND ENG. 61(1977)438
12.R. SHER (PRIV. COMM., 1977)
1 451 138
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