53-I -127
53-I -127 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-APR93
----JENDL-3.2 MATERIAL 5325
-----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) UPPER BOUNDARY OF RESOLVED RESONANCE REGION
WAS CHANGED FROM 4.252 KEV TO 2 KEV.
***********************************************************
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 2.0 KEV
RESONANCE PARAMETERS OF JENDL-2 WERE MODIFIED AS FOLLOWS:
EVALUATION FOR JENDL-2 WAS CARRIED OUT ON THE BASIS OF THE
MEASUREMENTS BY GARG ET AL./3/, CAUVIN ET AL./4/, ROHR ET
AL./5/, AND MACKLIN/6/. RESONANCE ENERGIES WERE BASED ON THE
DATA BY GARG ET AL. (64 LEVELS), BY ROHR ET AL. (190 LEVELS),
AND BY MACKLIN (119 LEVELS). NEUTRON WIDTHS WERE DERIVED FROM
THE DATA OF 2G*(REDUCED NEUTRON WIDTH) BY GARG ET AL., THOSE
OF 2G*(NEUTRON WIDTH) BY ROHR ET AL., AND THOSE OF G*(NEUTRON
WIDTH) AND NEUTRON CAPTURE AREAS BY MACKLIN. RADIATION WIDTHS
WERE DERIVED FROM THE DATA OF 2G*(RADIATION WIDTH) BY ROHR ET
AL. AND FROM THOSE OF (72/37)*G*(RADIATION WIDTH) BY MACKLIN.
AVERAGE RADIATION WIDTH OF 83.24 MEV OBTAINED BY AVERAGING THE
DATA BY ROHR ET AL., AND THAT OF 110 MEV GIVEN BY MACKLIN WERE
ADOPTED IN THE ENERGY REGIONS BELOW AND ABOVE 2650 EV,
RESPECTIVELY. THE DATA OF TOTAL SPIN J MEASURED BY CAUVIN ET
AL. WERE AVAILABLE FOR THE 13 RESONANCE LEVELS BELOW 240 EV.
AS FOR THE REMAINING 360 LEVELS, TARGET SPIN OF 2.5 WAS
ADOPTED AS TOTAL SPIN. TWO NEGATIVE RESONANCES WERE ADDED SO
AS TO REPRODUCE THE THERMAL CAPTURE AND SCATTERING CROSS
SECTIONS OF 6.2+-0.2 AND 3.54+-0.03 BARNS/7/, RESPECTIVELY.
SCATTERING RADIUS WAS ALSO TAKEN FROM MUGHABGHAB ET AL./7/
FOR JENDL-3, THE VALUES OF TOTAL SPIN J FOR THE 360 RESONANCE
LEVELS MENTIONED ABOVE WERE TENTATIVELY ESTIMATED WITH A
RANDOM NUMBER METHOD. NEUTRON AND RADIATION WIDTHS WERE
MODIFIED ON THE BASIS OF THE ESTIMATED J-VALUES. A RESONANCE
LEVEL MEASURED BY POPOV AND TSHETSYAK/8/ WAS ADDED AT 137.0
EV, AND AVERAGE RADIATION WIDTHS OF THE 20.41-, 65.93- AND
174.22-EV LEVELS WERE REPLACED BY THE NEW DATA MEASURED BY
THEM. RESONANCE PARAMETERS OF THE TWO NEGATIVE LEVELS WERE
ALSO MODIFIED SO AS TO REPRODUCE THE ABOVE-MENTIONED THERMAL
CAPTURE AND SCATTERING CROSS SECTIONS ACCORDING TO THE
MODIFICATION OF THE POSITIVE LEVELS.
UNRESOLVED RESONANCE REGION : 2 KEV - 100 KEV
UNRESOLVED RESONANCE PARAMETERS WERE ADOPTED FROM JENDL-2.
THE PARAMETERS WERE DETERMINED TO REPRODUCE THE CAPTURE CROSS
SECTION CALCULATED WITH CASTHY /9/. THE EFFECTIVE SCATTERING
RADIUS WAS OBTAINED FROM FITTING TO THE CALCULATED TOTAL CROSS
SECTION AT 100 KEV.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 0.760E-4, S1 = 1.580E-4, S2 = 0.990E-4, SG = 88.5E-4,
GG = 0.1175EV, R = 5.605 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 9.740 -
ELASTIC 3.540 -
CAPTURE 6.200 148
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
DETERMINED TO REPRODUCE A SYSTEMATIC TREND OF THE TOTAL CROSS
SECTION BY CHANGING R0 AND RSO OF IIJIMA-KAWAI POTENTIAL/11/.
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
GR. 0.0 5/2 +
1 0.0576 7/2 +
2 0.2028 3/2 +
3 0.3750 1/2 +
4 0.4179 5/2 +
5 0.6184 3/2 +
6 0.6286 7/2 +
7 0.6510 9/2 +
8 0.7165 11/2 +
9 0.7446 9/2 +
10 0.9910 3/2 +
LEVELS ABOVE 1.1 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/20/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (8.29E-03) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 760 MILLI-BARNS AT 25
KEV MEASURED BY YAMAMURO ET AL./21/
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 =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 (= 185.0) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/22/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, THE (N,2N), (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,2N) 1800.00 MB (RECOMMENDED BY BYCHKOV+/23/)
(N,P) 16.00 MB (RECOMMENDED BY FORREST/24/)
(N,ALPHA) 1.50 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. 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 = 45.97-0.199E R0 = 6.481 A0 = 0.62
WS = 6.502 RS = 6.926 AS = 0.35
VSO= 7.0 RSO= 6.49 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
---------------------------------------------------------------
51-SB-123 1.585E+01 6.213E-01 1.285E+00 5.469E+00 1.430E+00
51-SB-124 1.696E+01 5.600E-01 1.090E+01 3.433E+00 0.0
51-SB-125 1.700E+01 5.120E-01 7.883E-01 3.792E+00 1.090E+00
51-SB-126 1.700E+01 5.250E-01 7.566E+00 2.897E+00 0.0
52-TE-124 1.784E+01 6.740E-01 1.452E+00 8.479E+00 2.570E+00
52-TE-125 1.992E+01 5.590E-01 5.035E+00 5.527E+00 1.140E+00
52-TE-126 1.706E+01 6.100E-01 5.154E-01 6.554E+00 2.230E+00
52-TE-127 2.004E+01 5.380E-01 3.633E+00 5.165E+00 1.140E+00
53-I -125 * 1.789E+01 5.895E-01 2.042E+00 5.696E+00 1.430E+00
53-I -126 * 1.763E+01 5.871E-01 1.981E+01 4.127E+00 0.0
53-I -127 1.717E+01 6.263E-01 4.458E+00 5.757E+00 1.090E+00
53-I -128 1.715E+01 6.200E-01 2.329E+01 4.542E+00 0.0
---------------------------------------------------------------
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 7.0 FOR I -127 AND 5.0 FOR I -128.
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