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64-Gd-152 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-JAN09 20090105
----JEFF-311 MATERIAL 6425
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
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** Original data taken from: JEFF-3.1 **
** **
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***************************** JEFF-3.1 *************************
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** Original data taken from: JEFF-3.0 **
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***************************** JEFF-3.0 ***********************
DATA TAKEN FROM :- JENDL-3.2 (DIST-NOV90)
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HISTORY
90-03 NEW EVALUATION FOR JENDL-3 WAS COMPLETED BY JNDC FPND
W.G./1/
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 2.66 KEV
RESONANCE PARAMETERS BELOW 10 EV WERE EVALUATED ON THE
BASIS OF MUGHABGHAB/2/.
ABOVE 12 EV, PARAMETERS WERE ADOPTED FROM MACKLIN/3/. FOR
THE RESONANCES ONLY WHOSE CAPTURE AREA WAS MEASURED, NEUTRON
WIDTHS WERE DETERMINED FROM THE CAPTURE AREA AND AN AVERAGE
RADIATION WIDTH OF 0.0586 EV/3/. THE TOTAL SPIN J AND ORBITAL
ANGULAR MOMENTUM L WERE ASSIGNED BY CONSIDERING THE MAGNITUDE
OF THE CAPTURE AREA OF EACH RESONANCE.
A NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE
THERMAL CAPTURE CROSS SECTION OF 735+-20 BARNS AND THE CAPTURE
RESONANCE INTEGRAL OF 2020+-160 BARNS/2/.
SCATTERING RADIUS OF 8.2 FM WAS ESTIMATED FROM AN OPTICAL
MODEL CALCULATION SHOWN IN FIG. 2 OF REF./2/.
UNRESOLVED RESONANCE REGION : 2.66 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTION S0 WAS BASED ON THE COMPILATION
OF MUGHABGHAB, AND S1 AND S2 WERE CALCULATED WITH OPTICAL
MODEL CODE CASTHY/4/. THE OBSERVED LEVEL SPACING WAS ADJUSTED
TO REPRODUCE THE CAPTURE CROSS SECTION MEASURED BY BEER AND
MACKLIN/5/. 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 COMPILATION OF MUGHABGHAB.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 4.600E-4, S1 = 1.100E-4, S2 = 2.400E-4, SG = 50.6E-4,
GG = 0.054 EV, R = 3.918 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 1070 -
ELASTIC 13.92 -
CAPTURE 1056 991
(N,ALPHA) 6.957E-03
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/6/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE
ADOPTED FROM IIJIMA AND KAWAI/7/ AND WS WAS CHANGED. THE OMP'S
FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/8/
ALPHA = HUIZENGA AND IGO/9/
DEUTERON = LOHR AND HAEBERLI/10/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/11/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/12/ WERE EVALUATED BY IIJIMA ET AL./13/ 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
/14/.
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 BASED ON EVALUATED NUCLEAR
STRUCTURE DATA FILE (1987 VERSION)/15/ AND NUCLEAR DATA
SHEETS/16/.
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 0 +
1 0.3443 2 +
2 0.6154 0 +
3 0.7554 4 +
4 0.9306 2 +
5 1.0478 0 +
6 1.1092 2 +
7 1.1232 3 -
8 1.2273 6 +
9 1.2823 4 +
10 1.3147 1 -
11 1.3184 2 +
12 1.4340 3 +
13 1.4605 1 -
14 1.4705 5 -
15 1.5502 4 +
16 1.6056 2 +
17 1.6434 2 -
18 1.6681 6 +
19 1.6924 4 +
20 1.7467 8 +
21 1.7560 1 -
22 1.7716 2 +
23 1.8077 4 +
24 1.8396 2 +
25 1.8615 5 +
26 1.8620 2 +
27 1.8802 7 -
28 1.9154 2 +
29 1.9412 2 +
LEVELS ABOVE 1.975 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 (39.9E-4) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 531 MILLI-BARNS AT 250
KEV MEASURED BY BEER AND MACKLIN/5/.
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 (= 104.0) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/18/ 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) 13.60 MB (SYSTEMATICS OF FORREST/19/)
(N,ALPHA) 4.62 MB (SYSTEMATICS OF FORREST)
THE (N,ALPHA) CROSS SECTION BELOW 2.66 KEV WAS CALCULATED FROM
RESONANCE PARAMETERS, BY ASSUMING A MEAN ALPHA WIDTH OF 4.5E-6
EV SO AS TO REPRODUCE THE THERMAL CROSS SECTION/2/. THE
CROSS SECTION WAS AVERAGED IN SUITABLE ENERGY INTERVALS.
ABOVE 2.66 KEV, THE CROSS SECTION WAS CONNECTED SMOOTHLY TO
THE PEGASUS CALCULATION.
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 = 38.0 R0 = 7.439 A0 = 0.47
WS = 8.0 RS = 7.439 AS = 0.52
VSO= 7.0 RSO= 7.439 ASO= 0.47
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
---------------------------------------------------------------
62-SM-148 2.097E+01 5.505E-01 1.055E+00 6.694E+00 2.140E+00
62-SM-149 2.325E+01 5.052E-01 5.886E+00 5.504E+00 1.220E+00
62-SM-150 2.362E+01 5.230E-01 1.520E+00 6.973E+00 2.210E+00
62-SM-151 2.687E+01 5.000E-01 2.313E+01 6.327E+00 1.220E+00
63-EU-149 * 2.146E+01 5.314E-01 8.410E+00 5.238E+00 9.200E-01
63-EU-150 * 2.325E+01 5.290E-01 9.836E+01 4.788E+00 0.0
63-EU-151 2.511E+01 4.680E-01 8.573E+00 4.962E+00 9.900E-01
63-EU-152 2.484E+01 4.850E-01 8.700E+01 4.264E+00 0.0
64-GD-150 * 2.160E+01 5.290E-01 1.363E+00 6.202E+00 1.890E+00
64-GD-151 * 2.340E+01 5.266E-01 1.595E+01 5.750E+00 9.700E-01
64-GD-152 2.470E+01 4.810E-01 1.302E+00 6.106E+00 1.960E+00
64-GD-153 2.484E+01 5.130E-01 2.189E+01 5.847E+00 9.700E-01
---------------------------------------------------------------
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 8.194 FOR GD-152 AND 5.0 FOR GD-153.
REFERENCES
1) KAWAI, M. ET AL.: PROC. INT. CONF. ON NUCLEAR DATA FOR SCIENCE
AND TECHNOLOGY, MITO, P. 569 (1988).
2) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",
ACADEMIC PRESS (1984).
3) MACKLIN, R.L.: NUCL. SCI. ENG. 95, 304 (1987).
4) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).
5) BEER, H. AND MACKLIN, R.: ASTROPHYSICAL J., 331, 1047(1988).
6) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).
7) IIJIMA, S. AND KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77
(1983).
8) PEREY, F.G: PHYS. REV. 131, 745 (1963).
9) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).
10) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).
11) BECCHETTI, F.D., JR. AND GREENLEES, G.W.: POLARIZATION
PHENOMENA IN NUCLEAR REACTIONS ((EDS) H.H. BARSHALL AND
W. HAEBERLI), P. 682, THE UNIVERSITY OF WISCONSIN PRESS.
(1971).
12) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446
(1965).
13) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).
14) GRUPPELAAR, H.: ECN-13 (1977).
15) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE (JUNE 1987).
16) NUCLEAR DATA SHEETS, 30, 1 (1980).
17) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).
18) KIKUCHI, K. AND KAWAI, M.: "NUCLEAR MATTER AND NUCLEAR
REACTIONS", NORTH HOLLAND (1968).
19) FORREST, R.A.: AERE-R 12419 (1986).
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