58-Ce-144
58-CE-144 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-NOV90
----JENDL-3.2 MATERIAL 5849
-----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/.
MF = 1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF = 2 RESONANCE PARAMETERS
MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS
NO RESOLVED RESONANCE PARAMETERS
NO EXPERIMENTAL DATA WERE AVAILABLE.
UNRESOLVED RESONANCE REGION : 50 EV - 100 KEV
THE LOWER BOUNDARY OF 50 EV WAS DETERMINED SO THAT THE CAPTURE
RESONANCE INTEGRAL MIGHT AGREE WITH THE RECOMMENDED DATA IN
REF./3/. THE NEUTRON STRENGTH FUNCTIONS, S0, S1 AND S2 WERE
CALCULATED WITH OPTICAL MODEL CODE CASTHY/4/. 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 = 0.700E-4, S1 = 0.700E-4, S2 = 0.700E-4, SG = 0.308E-4,
GG = 0.060 EV, R = 4.880 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 3.780 -
ELASTIC 2.780 -
CAPTURE 1.000 2.55
MF = 3 NEUTRON CROSS SECTIONS
BELOW 50 EV, THE CAPTURE AND ELASTIC SCATTERING CROSS SECTIONS
WERE ASSUMED TO BE IN 1/V FORM AND CONSTANT, RESPECTIVELY. THE
CAPTURE CROSS SECTION AT 0.0253 EV WAS TAKEN FROM REF./3/, AND
THE ELASTIC SCATTERING CROSS SECTION WAS ESTIMATED BY ASSUMING
R = 4.7 FM. UNRESOLVED RESONANCE PARAMETERS WERE GIVEN IN THE
ENERGY RANGE FROM 50 EV TO 100 KEV.
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/5/ 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/6/, ISLAM ET AL./7/,
NISHIMURA ET AL./8/ 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/9/
ALPHA = HUIZENGA AND IGO/10/
DEUTERON = LOHR AND HAEBERLI/11/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/12/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/13/ WERE EVALUATED BY IIJIMA ET AL./14/ 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
/15/.
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./16/.
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 0 +
1 0.3973 2 +
2 0.9384 4 +
LEVELS ABOVE 1.242 MEV WERE ASSUMED TO BE OVERLAPPING.
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/17/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (2.80E-05) WAS DETERMINED FROM
THE SYSTEMATICS OF RADIATION WIDTH (0.06 EV) AND AVERAGE
S-WAVE RESONANCE LEVEL SPACING (2150 EV).
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 ASSUMED TO BE THE SAME
AS THAT OF CE-142.
FINALLY, THE (N,P) CROSS SECTION WAS NORMALIZED TO THE
FOLLOWING VALUE AT 14.5 MEV:
(N,P) 1.98 MB (SYSTEMATICS OF FORREST/18/)
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. FOR OTHER REACTIONS, ISOTROPIC DISTRI-
BUTIONS 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 TO OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 41.8 R0 = 6.955 A0 = 0.62
WS = 2.95+0.789E RS = 7.165 AS = 0.35
VSO= 7.0 RSO= 6.955 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
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
56-BA-142 * 2.045E+01 5.484E-01 4.211E-01 6.848E+00 2.500E+00
56-BA-143 * 2.216E+01 5.459E-01 4.559E+00 6.410E+00 1.580E+00
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
57-LA-143 * 2.059E+01 5.459E-01 7.647E+00 5.265E+00 9.200E-01
57-LA-144 1.843E+01 4.930E-01 8.672E+00 2.805E+00 0.0
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
58-CE-144 1.700E+01 6.000E-01 5.074E-01 6.214E+00 2.090E+00
58-CE-145 2.100E+01 5.500E-01 6.213E+00 5.723E+00 1.170E+00
---------------------------------------------------------------
SYST: * = LDP'S WERE DETERMINED FROM SYSTEMATICS.
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 5.0 FOR CE-144 AND 5.0 FOR CE-145.
REFERENCES
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INTERSCIENCE PUBLICATION (1978).
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