58-Ce-140
58-CE-140 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-NOV93
----JENDL-3.2 MATERIAL 5837
-----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/.
93-10 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) RESOLVED RESONANCE PARAMETERS
***********************************************************
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 200 KEV
RESONANCE PARAMETERS EVALUATED BY KIKUCHI/3/ FOR JENDL-2
WERE ADOPTED. NEUTRON WIDTHS WERE OBTAINED FROM DATA MEASURED
BY HACKEN ET AL./4/ AND CAMARDA /5/, AND RADIATION WIDTHS FROM
CAPTURE AREAS BY MUSGROVE ET AL./6/ FOR THE RESONANCES ONLY
WHOSE CAPTURE AREA WAS MEASURED, THE NEUTRON WIDTH WAS DEDUCED
BY ASSUMING THE AVERAGE RADIATION WIDTH OF 0.034+-0.029 EV FOR
S-WAVE RESONANCES AND 0.029+-0.008 EV FOR P-WAVE ONES. A
NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE CAPTURE
CROSS SECTION OF 0.57+-0.04 BARN AND THE ELASTIC SCATTERING
CROSS SECTION OF 2.83+-0.11 BARNS AT 0.0253 EV/7/.
FOR JENDL-3.2, NEUTRON WIDTHS OF 14 RESONANCES WERE REPLACED
WITH EXPERIMENTAL DATA OBTAINED BY OHKUBO/8/ IN THE ENERGY
RANGE FROM 2.5437 KEV TO 55.113 KEV. PARAMETERS OF THE
NEGATIVE RESONANCE WERE RE-ADJUSTED TO THE ABOVE THERMAL CROSS
SECTIONS /7/.
NO UNRESOLVED RESONANCE PARAMETERS ARE GIVEN.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 3.3995 -
ELASTIC 2.8299 -
CAPTURE 0.5697 0.278
MF = 3 NEUTRON CROSS SECTIONS
BELOW 200 KEV, RESONANCE PARAMETERS WERE GIVEN.
ABOVE 200 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL
CALCULATION WAS PERFORMED WITH CASTHY/9/, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/10/ 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/11/, ISLAM ET AL./12/,
NISHIMURA ET AL./13/ 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/14/
ALPHA = HUIZENGA AND IGO/15/
DEUTERON = LOHR AND HAEBERLI/16/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/17/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/18/ WERE EVALUATED BY IIJIMA ET AL./19/ 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
/20/.
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./21/.
NO. ENERGY(MEV) SPIN-PARITY DWBA CAL.
GR. 0.0 0 +
1 1.5964 2 + *
2 1.9033 0 +
3 2.0840 4 +
4 2.1081 6 +
5 2.3482 2 +
6 2.3500 5 +
7 2.4123 3 +
8 2.4643 3 - *
9 2.4812 4 +
10 2.5161 3 +
11 2.5217 2 +
12 2.5334 1 +
13 2.5475 2 +
14 2.8997 2 +
15 3.0169 0 +
16 3.0400 3 -
17 3.1190 2 +
18 3.2330 0 +
19 3.2500 5 -
LEVELS ABOVE 3.32 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/22/. DEFORMATION PARAMETERS (BETA2 = 0.1012 AND
BETA3 = 0.127) WERE BASED ON THE DATA COMPILED BY RAMAN ET
AL./23/ AND SPEAR/24/, 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/25/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (6.30E-06) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 5.0 MILLI-BARNS AT 70
KEV MEASURED BY MUSGROVE ET AL./26/
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 =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/10/.
THE KALBACH'S CONSTANT K (= 247.8) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/27/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,P) 7.50 MB (MEASURED BY TENG DAN+/28/)
(N,ALPHA) 4.60 MB (RECOMMENDED BY FORREST/29/)
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 = 6.89 A0 = 0.62
WS = 2.95+0.789E RS = 7.098 AS = 0.35
VSO= 7.0 RSO= 6.89 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-136 1.610E+01 6.500E-01 5.721E-01 6.928E+00 2.280E+00
56-BA-137 1.645E+01 5.640E-01 5.394E-01 4.905E+00 1.580E+00
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
57-LA-137 1.558E+01 6.210E-01 3.521E+00 4.624E+00 7.000E-01
57-LA-138 1.450E+01 6.310E-01 7.202E+00 3.634E+00 0.0
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
58-CE-138 * 1.618E+01 5.580E-01 2.611E-01 5.011E+00 1.870E+00
58-CE-139 1.374E+01 6.450E-01 9.282E-01 4.685E+00 1.170E+00
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
---------------------------------------------------------------
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 6.125 FOR CE-140 AND 9.569 FOR CE-141.
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