62-Sm-151
62-SM-151 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-NOV90
----JENDL-3.2 MATERIAL 6246
-----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 0.2461 KEV
RESONANCE PARAMETERS WERE EVALUATED BY KIKUCHI ET AL./3/ FOR
JENDL-2, AND TOTAL SPIN J WAS MODIFIED WITH A RANDOM NUMBER
METHOD FOR JENDL-3.
NEUTRON WIDTHS WERE OBTAINED BY AVERAGING THE DATA OF
PATTENDEN/4/, KIROUAC AND EILAND/5/ AND ANUFRIEV ET AL./6/
RADIATION WIDTHS WERE TAKEN FROM REF./5/ OR THE AVERAGE VALUE
OF 0.065+-0.015 EV WAS ADOPTED. A NEGATIVE RESONANCE WAS
ADDED AT -0.12 EV SO AS TO REPRODUCE THE THERMAL CAPTURE AND
TOTAL CROSS SECTIONS GIVEN BY MUGHABGHAB/7/.
UNRESOLVED RESONANCE REGION : 0.2461 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTION S0 WAS BASED ON THE COMPILATION
OF MUGHABGHAB, AND S1 AND S2 WERE CALCULATED WITH THE OPTICAL
MODEL CODE CASTHY/8/. 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 = 4.200E-4, S1 = 1.400E-4, S2 = 2.300E-4, SG = 481.E-4,
GG = 0.092 EV, R = 5.720 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 15210 -
ELASTIC 50.41 -
CAPTURE 15160 3410
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/8/, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/9/ 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/10/, KELLIE ET AL./11/ AND SO ON.
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 0.0048 3/2 -
2 0.0658 7/2 -
3 0.0697 5/2 -
4 0.0915 9/2 +
5 0.1048 3/2 -
6 0.1479 13/2 +
7 0.1677 5/2 +
8 0.1684 5/2 -
9 0.1754 9/2 -
10 0.2090 7/2 -
11 0.2611 11/2 -
12 0.2850 1/2 -
13 0.2946 9/2 -
14 0.3026 5/2 -
15 0.3068 3/2 +
16 0.3138 1/2 -
17 0.3153 3/2 -
18 0.3239 7/2 +
19 0.3449 3/2 +
20 0.3576 1/2 +
LEVELS ABOVE 0.37 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 (5.57E-02) WAS DETERMINED FROM
THE SYSTEMATICS.
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) 4.83 MB (SYSTEMATICS OF FORREST/21/)
(N,ALPHA) 1.90 MB (SYSTEMATICS OF 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 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 = 6.337 A0 = 0.655
WS = 8.455 RS = 7.668 AS = 0.448
VSO= 7.0 RSO= 6.816 ASO= 0.6
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
60-ND-147 2.398E+01 4.850E-01 5.510E+00 5.235E+00 1.180E+00
60-ND-148 2.359E+01 5.150E-01 1.328E+00 6.751E+00 2.170E+00
60-ND-149 2.657E+01 4.750E-01 1.192E+01 5.636E+00 1.180E+00
60-ND-150 2.415E+01 5.280E-01 1.867E+00 7.314E+00 2.290E+00
61-PM-148 2.227E+01 4.300E-01 1.420E+01 2.672E+00 0.0
61-PM-149 2.377E+01 4.890E-01 8.141E+00 5.075E+00 9.900E-01
61-PM-150 2.270E+01 3.800E-01 7.943E+00 1.973E+00 0.0
61-PM-151 2.882E+01 4.260E-01 8.842E+00 4.956E+00 1.110E+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
62-SM-152 2.375E+01 5.470E-01 2.365E+00 7.669E+00 2.330E+00
---------------------------------------------------------------
SPIN CUTOFF PARAMS WERE CALCULATED AS 0.146*SQRT(A)*A**(2/3).
IN THE CASTHY CALCULATION, SPIN CUTOFF FACTORS AT 0 MEV WERE
ASSUMED TO BE 6.675 FOR SM-151 AND 5.306 FOR SM-152.
REFERENCES
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