62-Sm-154
62-SM-154 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-JUN94
----JENDL-3.2 MATERIAL 6255
-----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/.
94-06 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(3,2) TO KEEP CONSISTENCY OF CROSS SECTIONS.
(3,4), (3,51-56), (3,59), (3,64)
DIRECT INELASTIC SCATTERING CONTRIBUTION
WAS INCLUDED.
(4,51-56), (4,59), (4,64)
DIRECT INELASTIC SCATTERING CONTRIBUTIONS.
***********************************************************
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 4.654 KEV
RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2 EVALUATED BY
KIKUCHI ET AL./3/ AND WERE MODIFIED FOR JENDL-3.
FOR JENDL-2, PARAMETERS WERE ADOPTED FROM RAHN ET AL./4/
FOR THE LEVELS WHOSE RADIATION WIDTH WAS NOT MEASURED, THE
AVERAGE VALUE OF 0.079+-0.013 EV WAS ASSUMED. A NEGATIVE
RESONANCE WAS ADDED AT -35 EV SO AS TO REPRODUCE THE CAPTURE
CROSS SECTION OF 5.5+-1.1 BARNS AT 0.0253 EV/5/.
FOR JENDL-3, THE RADIATION WIDTH OF THE NEGATIVE RESONANCE
WAS CHANGED FROM 0.079 EV TO 0.1266 EV AND THE SCATTERING
RADIUS FROM 8.34 FM TO 9.67 FM SO AS TO REPRODUCE WELL THE
THERMAL CROSS SECTIONS (CAPTURE = 8.4 B, SCATTERING = 11 B)
COMPILED BY MUGHABGHAB/3/.
UNRESOLVED RESONANCE REGION : 4.654 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTIONS, S0 AND S1 WERE BASED ON THE
COMPILATION OF MUGHABGHAB, AND S2 WAS CALCULATED WITH OPTICAL
MODEL CODE CASTHY/6/. 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 WIDTH GG WAS BASED ON THE COMPILATION OF
MUGHABGHAB.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 1.800E-4, S1 = 0.800E-4, S2 = 2.400E-4, SG = 7.09E-4,
GG = 0.079 EV, R = 7.680 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 19.39 -
ELASTIC 11.00 -
CAPTURE 8.393 36.2
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/7/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE
DETERMINED TO REPRODUCE THE TOTAL CROSS SECTION OF NATURAL SM
MEASURED BY FOSTER AND GLASGOW/8/, KELLIE ET AL./9/ AND SO
ON. 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/. THE
LEVELS MARKED WITH * INCLUDE THE CONTRIBUTION OF DIRECT
INELASTIC SCATTERING, WHICH WAS CALCUALTED BY THE COUPLED-
CHANNELS THEORY WITH ECIS88 CODE/18/. THE GROUND STATE
ROTATIONAL BAND (0+ 2+ 4+ 6+ 8+ 10+) AND OCTUPOLE VIBRATIONAL
BAND (1- 3- 5-) WERE COUPLED SIMULTANEOUSLY. THE WS PARAMETER
WAS ADJUSTED TO 2.5 MEV, OTHERWISE THE SPHERICAL PARAMETERS
WERE USED. THE BETA-2 (= 0.3410) AND BETA-3 (= 0.080) WERE
TAKEN FROM ORNL COMPILATIONS/19, 20/.
NO. ENERGY(MEV) SPIN-PARITY C.C. CALCULATION
GR. 0.0 0 +
1 0.0820 2 + *
2 0.2670 4 + *
3 0.5470 6 + *
4 0.9060 8 + *
5 0.9210 1 - *
6 1.0120 3 - *
7 1.0990 0 +
8 1.1780 2 +
9 1.1820 5 - *
10 1.2020 0 +
11 1.2860 3 -
12 1.3380 4 +
13 1.3720 4 +
14 1.4010 10 + *
15 1.4400 2 +
16 1.4750 1 -
17 1.5150 3 +
18 1.5390 3 +
19 1.5850 3 -
20 1.6620 4 +
21 1.6740 0 +
22 1.7070 4 +
23 1.7550 2 +
24 1.8170 4 +
LEVELS ABOVE 1.85 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/21/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (5.84E-4) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 70 MILLI-BARNS AT 200
KEV MEASURED BY KONONOV ET AL./22/ AND BY FAWCETT ET AL./23/
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 =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 (= 25.0) WAS ASSUMED TO BE THE SAME
AS THAT OF SM-148.
FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,P) 2.23 MB (SYSTEMATICS OF FORREST/24/)
(N,ALPHA) 0.85 MB (MEASURED BY BARI/25/)
THE (N,2N) CROSS SECTION WAS DETERMINED BY EYE-GUIDING OF
THE DATA MEASURED BY FREHAUT ET AL./26/
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 FROM OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 46.96-0.0172E R0 = 6.379 A0 = 0.655
WS = 8.455 RS = 7.719 AS = 0.448
VSO= 7.0 RSO= 6.861 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
---------------------------------------------------------------
60-ND-150 2.415E+01 5.280E-01 1.867E+00 7.314E+00 2.290E+00
60-ND-151 2.618E+01 4.800E-01 1.152E+01 5.656E+00 1.180E+00
60-ND-152 * 2.361E+01 5.242E-01 1.915E+00 6.885E+00 2.100E+00
60-ND-153 * 2.297E+01 5.217E-01 7.977E+00 5.732E+00 1.180E+00
61-PM-151 2.882E+01 4.260E-01 8.842E+00 4.956E+00 1.110E+00
61-PM-152 * 2.440E+01 5.242E-01 1.481E+02 5.009E+00 0.0
61-PM-153 2.285E+01 4.950E-01 7.324E+00 4.895E+00 9.200E-01
61-PM-154 * 2.312E+01 5.193E-01 7.816E+01 4.543E+00 0.0
62-SM-152 2.375E+01 5.470E-01 2.365E+00 7.669E+00 2.330E+00
62-SM-153 2.572E+01 5.160E-01 2.101E+01 6.405E+00 1.220E+00
62-SM-154 2.190E+01 5.600E-01 1.960E+00 7.188E+00 2.140E+00
62-SM-155 2.402E+01 5.080E-01 8.478E+00 5.767E+00 1.220E+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 9.75 FOR SM-154 AND 5.0 FOR SM-155.
REFERENCES
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AND APPLIED SCIENCE, SANTA FE., VOL. 2, P.1627 (1985).
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ACADEMIC PRESS (1984).
4) RAHN, F., ET AL.: PHYS. REV., C6, 251 (1972).
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(1973).
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18) RAYNAL, J. CODE ECIS88
19) RAMAN, S. ET AL.: AT. DATA AND NUCL. DATA TABLES 36, 1 (1987).
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