58-Ce-142
58-CE-142 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-SEP93
----JENDL-3.2 MATERIAL 5843
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/
90-03 MODIFICATION FOR JENDL-3 WAS MADE/2/.
93-09 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) UNRESOLVED RESONANCE PARAMETERS RE-ADJUSTED
SO AS TO REPRODUCE THE RE-NORMALIZED CAPTURE
CROSS SECTION.
(3,102) RE-NORMALIZATION.
(3,2), (3,4), (3,51-91) AND ANGULAR DISTRIBUTIONS
SMALL EFFECTS OF THE RE-NORMALIZATION OF
CAPTURE CROSS SECTION.
***********************************************************
MF = 1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF = 2 RESONANCE PARAMETERS
MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 26 KEV
RESONANCE PARAMETERS FOR JENDL-3 WERE EVALUATED BY TAKING
INTO ACCOUNT THE EXPERIMENTAL DATA BY OHKUBO ET AL./3/ IN
WHICH REDUCED NEUTRON WIDTHS WERE GIVEN IN THE ENERGY RANGE
FROM 1.277 TO 54.9 KEV. THE UPPER BOUNDARY OF RESOLVED
RESONANCE REGION WAS DETERMINED TO BE 26 KEV AS A RESULT OF
STAIR-CASE PLOTTING.
AVERAGE RADIATION WIDTH OF 0.08 EV WAS ESTIMATED FROM FIG. 9
IN REF./4/ AND THE SYSTEMATICS CURVE BY BENZI AND REFFO/5/.
SCATTERING RADIUS OF 5.9 FM WAS ADOPTED FROM THE COMPILATION
BY MUGHABGHAB ET AL./4/
NEUTRON ORBITAL ANGULAR MOMENTUM L OF SOME RESONANCES WAS
ESTIMATED WITH A METHOD OF BOLLINGER AND THOMAS/6/.
A NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE
THERMAL CAPTURE CROSS SECTION OF 0.95+-0.05 BARN RECOMMENDED
BY MUGHABGHAB ET AL.
UNRESOLVED RESONANCE REGION : 26 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTION S0 WAS BASED ON THE COMPILATION
OF MUGHABGHAB ET AL., AND S1 AND S2 WERE CALCULATED WITH
OPTICAL MODEL CODE CASTHY/7/. THE OBSERVED LEVEL SPACING WAS
DETERMINED TO REPRODUCE THE CAPTURE CROSS SECTION CALCULATED
WITH CASTHY. THE EFFECTIVE SCATTERING RADIUS WAS OBTAINED
FROM FITTING TO THE CALCULATED TOTAL CROSS SECTION AT 100 KEV.
THE RADIATION WIDTH GG WAS BASED ON THE SYSTEMATICS OF
MEASURED VALUES FOR NEIGHBORING NUCLIDES.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 1.200E-4, S1 = 0.700E-4, S2 = 0.600E-4, SG = 0.233E-4,
GG = 0.070 EV, R = 4.537 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 1.618 -
ELASTIC 0.6145 -
CAPTURE 1.004 0.933
MF = 3 NEUTRON CROSS SECTIONS
BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.
ABOVE 100 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL
CALCULATION WAS PERFORMED WITH CASTHY, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/8/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WHICH
WERE DETERMINED SO AS TO REPRODUCE THE LA-139 TOTAL CROSS
SECTION MEASURED BY FOSTER AND GLASGOW/9/, ISLAM ET AL./10/,
NISHIMURA ET AL./11/ AND SO ON WERE ADOPTED BY ASSUMING THAT THE
TOTAL CROSS SECTION OF CE WAS SIMILER TO THAT OF LA-139. THE
OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/12/
ALPHA = HUIZENGA AND IGO/13/
DEUTERON = LOHR AND HAEBERLI/14/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/15/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/16/ WERE EVALUATED BY IIJIMA ET AL./17/ MORE
EXTENSIVE DETERMINATION AND MODIFICATION WERE MADE IN THE
PRESENT WORK. TABLE 2 SHOWS THE LEVEL DENSITY PARAMETERS USED
IN THE PRESENT CALCULATION. ENERGY DEPENDENCE OF SPIN CUT-OFF
PARAMETER IN THE ENERGY RANGE BELOW E-JOINT IS DUE TO GRUPPELAAR
/18/.
MT = 1 TOTAL
SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED.
MT = 2 ELASTIC SCATTERING
CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).
MT = 4, 51 - 91 INELASTIC SCATTERING
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WAS
ADOPTED. THE LEVEL SCHEME WAS TAKEN FROM REF./19/.
NO. ENERGY(MEV) SPIN-PARITY DWBA CAL.
GR. 0.0 0 +
1 0.6412 2 + *
2 1.2193 4 +
3 1.5361 2 +
4 1.6526 3 - *
5 2.0042 2 +
6 2.0300 0 +
7 2.1870 1 +
8 2.3640 1 +
9 2.3980 1 +
LEVELS ABOVE 2.5 MEV WERE ASSUMED TO BE OVERLAPPING.
FOR THE LEVELS WITH AN ASTERISK, THE CONTRIBUTION OF DIRECT
INELASTIC SCATTERING CROSS SECTIONS WAS CALCULATED BY THE
DWUCK-4 CODE/20/. DEFORMATION PARAMETERS (BETA2 = 0.1236 AND
BETA3 = 0.132) WERE BASED ON THE DATA COMPILED BY RAMAN ET
AL./21/ AND SPEAR/22/, RESPECTIVELY.
MT = 102 CAPTURE
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH
CASTHY WAS ADOPTED. DIRECT AND SEMI-DIRECT CAPTURE CROSS
SECTIONS WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI
AND REFFO/5/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (2.06E-05) WAS DETERMINED SO A
TO REPRODUCE THE CAPTURE CROSS SECTION OF 19+-4 MB AT 25 KEV
MEASURED BY R.P. ANAND ET AL./23/
MT = 16 (N,2N) CROSS SECTION
MT = 17 (N,3N) CROSS SECTION
MT = 22 (N,N'A) CROSS SECTION
MT = 28 (N,N'P) CROSS SECTION
MT = 32 (N,N'D) CROSS SECTION
MT = 33 (N,N'T) CROSS SECTION
MT =103 (N,P) CROSS SECTION
MT =104 (N,D) CROSS SECTION
MT =105 (N,T) CROSS SECTION
MT =107 (N,ALPHA) CROSS SECTION
THESE REACTION CROSS SECTIONS WERE CALCULATED WITH THE
PREEQUILIBRIUM AND MULTI-STEP EVAPORATION MODEL CODE PEGASUS.
THE KALBACH'S CONSTANT K (= 100.0) WAS DETERMINED TO REPRODUCE
ENERGY DEPENDENCE OF THE (N,2N) CROSS SECTION MEASURED BY
TENG DAN ET AL./24/.
FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,P) 4.80 MB (RECOMMENDED BY FORREST/25/)
(N,ALPHA) 3.00 MB (RECOMMENDED BY FORREST)
THE (N,2N) CROSS SECTION WAS MODIFIED BY EYE-GUIDING OF THE
DATA MEASURED BY TENG DAN ET AL./24/ THE (N,3N) CROSS SECTION
WAS DETERMINED BY SUBTRACTING THE (N,2N) CROSS SECTION FROM
THE SUM OF (N,2N) AND (N,3N) CROSS SECTIONS CALCULATED WITH
PEGASUS.
MT = 251 MU-BAR
CALCULATED WITH CASTHY.
MF = 4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
LEGENDRE POLYNOMIAL COEFFICIENTS FOR ANGULAR DISTRIBUTIONS ARE
GIVEN IN THE CENTER-OF-MASS SYSTEM FOR MT=2 AND DISCRETE INELAS-
TIC LEVELS, AND IN THE LABORATORY SYSTEM FOR MT=91. THEY WERE
CALCULATED WITH CASTHY. CONTRIBUTION OF DIRECT INELASTIC
SCATTERING WAS CALCULATED WITH DWUCK-4. FOR OTHER REACTIONS,
ISOTROPIC DISTRIBUTIONS IN THE LABORATORY SYSTEM WERE ASSUMED.
MF = 5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE CALCULATED WITH
PEGASUS FOR INELASTIC SCATTERING FROM OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 41.8 R0 = 6.923 A0 = 0.62
WS = 2.95+0.789E RS = 7.132 AS = 0.35
VSO= 7.0 RSO= 6.923 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
56-BA-138 1.390E+01 7.200E-01 4.123E-01 7.233E+00 2.430E+00
56-BA-139 2.022E+01 4.800E-01 5.326E-01 4.629E+00 1.580E+00
56-BA-140 1.500E+01 6.930E-01 5.738E-01 7.244E+00 2.340E+00
56-BA-141 1.600E+01 7.010E-01 3.318E+00 7.141E+00 1.580E+00
57-LA-139 1.380E+01 6.500E-01 1.653E+00 4.468E+00 8.500E-01
57-LA-140 1.558E+01 5.900E-01 7.912E+00 3.425E+00 0.0
57-LA-141 1.894E+01 5.130E-01 3.056E+00 4.024E+00 7.600E-01
57-LA-142 2.026E+01 4.610E-01 1.125E+01 2.749E+00 0.0
58-CE-140 1.413E+01 6.541E-01 3.376E-01 5.852E+00 2.020E+00
58-CE-141 1.714E+01 5.150E-01 7.134E-01 3.957E+00 1.170E+00
58-CE-142 1.600E+01 6.000E-01 4.210E-01 5.674E+00 1.930E+00
58-CE-143 1.900E+01 5.500E-01 2.613E+00 5.094E+00 1.170E+00
---------------------------------------------------------------
SPIN CUTOFF PARAMETERS WERE CALCULATED AS 0.146*SQRT(A)*A**(2/3).
IN THE CASTHY CALCULATION, SPIN CUTOFF FACTORS AT 0 MEV WERE
ASSUMED TO BE 3.236 FOR CE-142 AND 5.0 FOR CE-143.
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