60-Nd-142
60-ND-142 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-NOV93
----JENDL-3.2 MATERIAL 6025
-----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/.
93-11 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 PARAMETERS FOR MLBW FORMULA (BELOW 26.0 KEV)
RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2/3/ AFTER THE
FOLLOWING MODIFICATION.
EVALUATION FOR JENDL-2 WAS MADE BY MAINLY ON THE BASIS OF
THE DATA MEASURED BY TELLIER/4/ AND MUSGROVE ET AL./5/
RESONANCE ENERGIES WERE ADJUSTED TO THOSE OF TELLIER. AVERAGE
RADIATION WIDTHS WERE ASSUMED TO BE 0.078 EV FOR S-WAVE AND
SOME LARGE P-WAVE RESONANCES AND TO BE 0.046 EV FOR P-WAVE
ONES.
FOR JENDL-3, PARAMETERS OF A NEGATIVE RESONANCE WAS
MODIFIED SO AS TO REPRODUCE THE THERMAL CAPTURE CROSS SECTION
OF 18.7+-0.7 BARNS/6/ AND THE RESONANCE INTEGRAL. HOWEVER,
THE CALCULATED RESONANCE INTEGRAL IS STILL TOO SMALL.
FOR JENDL-3.2, THESE RESONANCE PARAMETERS WERE MODIFIED SO
AS TO REPRODUCE THE CAPTURE AREA DATA MEASURED AT ORNL, BY
TAKING ACCOUNT OF THE CORRECTION FACTOR (0.967) ANNOUNCED BY
ALLEN ET AL./7/. THE PARAMETERS OF A NEGATIVE RESONANCE AND
SCATTERING RADIUS WERE ADJUSETED TO GET BETTER AGREEMENT WITH
RECOMMENDED THERMAL CROSS SECTIONS/8/.
UNRESOLVED RESONANCE REGION : 26 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTIONS S0 AND S1 WERE BASED ON THE
COMPILATION OF MUGHABGHAB ET AL./8/, AND S2 WAS CALCULATED
WITH OPTICAL MODEL CODE CASTHY/9/. 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 WIDTHS GG(S) AND GG(P) WERE BASED
ON THE COMPILATION OF MUGHABGHAB ET AL.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 1.500E-4, S1 = 0.400E-4, S2 = 1.700E-4, SG(S)= 1.24E-4,
SG(P)=0.828E-4, GG(S)=0.064 EV, GG(P)= 0.044 EV, R= 5.805 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 26.400 -
ELASTIC 7.700 -
CAPTURE 18.700 8.68
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/10/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE
ADOPTED FROM THE PARAMETERS DETERMINED BY IIJIMA AND KAWAI/11/
FOR ND-143. 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 1.5757 2 + *
2 2.0844 3 - *
3 2.1010 4 +
4 2.2090 6 +
5 2.2172 0 +
6 2.3400 2 +
7 2.3846 1 +
8 2.5833 2 +
9 2.8000 4 +
10 2.8459 2 +
11 2.9780 0 +
LEVELS ABOVE 3.008 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 = 0.0926 AND
BETA3 = 0.109) 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/23/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (0.969E-4) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 59.0 MILLI-BARNS AT 30
KEV MEASURED BY MUSGROVE ET AL./5,7/
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 =106 (N,HE3) 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 (= 213.8) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/24/ 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) 13.80 MB (RECOMMENDED BY FORREST/25/)
(N,ALPHA) 6.80 MB (RECOMMENDED BY FORREST)
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 TO OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 45.76 R0 = 6.73 A0 = 0.6
WS = 6.97 RS = 6.417 AS = 0.45
VSO= 7.0 RSO= 6.678 ASO= 0.6
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
---------------------------------------------------------------
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
59-PR-139 * 1.630E+01 5.556E-01 2.158E+00 3.843E+00 7.000E-01
59-PR-140 1.448E+01 6.430E-01 7.927E+00 3.814E+00 0.0
59-PR-141 1.400E+01 6.500E-01 1.810E+00 4.559E+00 8.500E-01
59-PR-142 1.595E+01 6.150E-01 1.201E+01 3.974E+00 0.0
60-ND-140 * 1.641E+01 5.532E-01 2.596E-01 5.024E+00 1.880E+00
60-ND-141 1.477E+01 6.091E-01 9.537E-01 4.587E+00 1.180E+00
60-ND-142 1.288E+01 6.710E-01 2.250E-01 5.526E+00 2.030E+00
60-ND-143 1.826E+01 4.710E-01 5.220E-01 3.613E+00 1.180E+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 5.579 FOR ND-142 AND 7.227 FOR ND-143.
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