54-Xe-136
54-XE-136 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-NOV90
----JENDL-3.2 MATERIAL 5461
-----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
RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 490 KEV
RESONANCE PARAMETERS WERE NEWLY EVALUATED AS FOLLOWS :
RESONANCE ENERGIES OF THE 1ST LEVEL AND OF THE OTHER LEVELS
WERE BASED ON THE DATA MEASURED BY MACKLIN/3/ AND FOGELBERG ET
AL./4/, RESPECTIVELY. NEUTRON WIDTH OF THE 1ST LEVEL AT 2154
EV WAS DERIVED FROM THE NEUTRON CAPTURE AREA MEASURED AND THE
RADIATION WIDTH ASSUMED BY MACKLIN. NEUTRON WIDTHS OF THE
REMAINING 35 LEVELS FROM 18.393 TO 480.750 KEV WERE TAKEN FROM
THE DATA BY FOGELBERG ET AL. AVERAGE RADIATION WIDTH OF 122.5
MEV WAS ADOPTED FOR ALL THE RESONANCE LEVELS EXCEPT THE 1ST
AND 2ND LEVELS. NEUTRON ORBITAL ANGULAR MOMENTUM L OF SOME
RESONANCES WAS ESTIMATED WITH A METHOD OF BOLLINGER AND THOMAS
/5/. TOTAL SPIN J OF SOME RESONANCES WAS TENTATIVELY
ESTIMATED WITH A RANDOM NUMBER METHOD. SCATTERING RADIUS WAS
TAKEN FROM THE GRAPH (FIG. 1, PART A) BY MUGHABGHAB ET AL./6/
A NEGATIVE RESONANCE WAS ADDED AT -822.03 EV, AND THE ABOVE
AVERAGE RADIATION WIDTH WAS DETERMINED SO AS TO REPRODUCE THE
THERMAL CAPTURE CROSS SECTION OF 260+-20 MEV GIVEN BY
MUGHABGHAB ET AL.
NO UNRESOLVED RESONANCE REGION
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 6.348 -
ELASTIC 6.088 -
CAPTURE 0.2600 0.142
MF = 3 NEUTRON CROSS SECTIONS
BELOW 490 KEV, RESOLVED RESONANCE PARAMETERS WERE GIVEN.
ABOVE 490 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL
CALCULATION WAS PERFORMED WITH CASTHY/7/, 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 WERE
DETERMINED TO REPRODUCE A SYSTEMATIC TREND OF THE TOTAL CROSS
SECTION BY CHANGING R0 AND RSO OF IIJIMA-KAWAI POTENTIAL/9/.
THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/10/
ALPHA = HUIZENGA AND IGO/11/
DEUTERON = LOHR AND HAEBERLI/12/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/13/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/14/ WERE EVALUATED BY IIJIMA ET AL./15/ 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
/16/.
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./17/
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 0 +
1 1.3132 2 +
2 1.6947 4 +
3 1.8920 6 +
4 1.9200 2 +
5 2.1080 6 +
6 2.2620 6 +
7 2.2897 2 +
8 2.4148 2 +
9 2.4480 4 +
10 2.5604 4 +
11 2.6347 2 +
12 2.8490 3 +
13 2.8710 1 +
14 2.9565 2 +
LEVELS ABOVE 3.141 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/18/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (7.48E-7) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 0.8 MILLI-BARN AT 100
KEV.
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 =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 (= 307.3) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/19/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, THE (N,2N) CROSS SECTION WAS NORMALIZED TO THE
FOLLOWING VALUE AT 14.5 MEV:
(N,2N) 1750.00 MB (RECOMMENDED BY BYCHKOV+/20/)
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
---------------------------------------------------------------
52-TE-132 1.745E+01 4.920E-01 1.477E-01 4.373E+00 1.840E+00
52-TE-133 * 1.516E+01 5.701E-01 7.561E-01 4.112E+00 1.140E+00
52-TE-134 * 1.340E+01 5.677E-01 8.188E-02 4.291E+00 1.990E+00
52-TE-135 * 1.498E+01 5.653E-01 6.589E-01 3.980E+00 1.140E+00
53-I -133 1.559E+01 4.890E-01 7.662E-01 2.691E+00 7.000E-01
53-I -134 1.500E+01 5.600E-01 4.764E+00 2.769E+00 0.0
53-I -135 1.350E+01 5.500E-01 5.307E-01 2.961E+00 8.500E-01
53-I -136 1.450E+01 5.500E-01 3.589E+00 2.460E+00 0.0
54-XE-134 1.400E+01 6.300E-01 3.184E-01 5.224E+00 1.820E+00
54-XE-135 1.550E+01 5.565E-01 7.506E-01 4.010E+00 1.120E+00
54-XE-136 1.400E+01 6.500E-01 3.270E-01 5.679E+00 1.970E+00
54-XE-137 1.550E+01 5.565E-01 7.470E-01 4.010E+00 1.120E+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 8.553 FOR XE-136 AND 5.0 FOR XE-137.
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