62-Sm-148
62-SM-148 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-NOV93
----JENDL-3.2 MATERIAL 6237
-----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/.
93-11 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) UPPER BOUNDARY OF THE RESOLVED RESONANCE
REGION WAS CHANGED FROM 8 KEV TO 5.5 KEV.
(3,2), (3,4) EFFECTS OF MODIFICATION OF PARTIAL INELA-
STIC AND CAPTURE CROSS SECTIONS.
(3,51), (3,52), (4,51), (4,52)
DIRECT COMPONENTS ADDED.
(3,53-61), (3,91) AND THEIR ANGULAR DISTRIBUTIONS
EFFECTS OF RENORMALIZATION OF CAPTURE CROSS
SECTION.
(3,102) RENORMALIZATION
***********************************************************
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 5.5 KEV
RESONANCE PARAMETERS WERE NEWLY EVALUATED ON THE BASIS OF THE
DATA MEASURED BY MIZUMOTO AND ZHAO/3,4/.
RESONANCE ENERGIES AND NEUTRON WIDTHS WERE TAKEN FROM THE
TRANSMISSION MEASURMENTS BY MIZUMOTO AND ZHAO. RADIATION
WIDTH OF 0.06 EV USED FOR THEIR ANALYSIS WAS ADOPTED. A
NEGATIVE RESONANCE WAS ADDED SO AS TO REPRODUCE THE THERMAL
CAPTURE CROSS SECTION GIVEN BY MUGHABGHAB/5/.
UNRESOLVED RESONANCE REGION : 5.5 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 SYSTEMATICS OF
MEASURED VALUES FOR NEIGHBORING NUCLIDES.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 3.800E-4, S1 = 1.900E-4, S2 = 2.200E-4, SG = 4.97E-4,
GG = 0.065 EV, R = 5.150 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 3.4098 -
ELASTIC 0.9966 -
CAPTURE 2.4132 45.2
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/.
NO. ENERGY(MEV) SPIN-PARITY (DIRECT)
GR. 0.0 0 +
1 0.5510 2 + *
2 1.1620 3 - *
3 1.1800 4 +
4 1.4300 0 +
5 1.4530 2 +
6 1.4650 1 -
7 1.5950 5 -
8 1.6490 2 +
9 1.6630 2 +
10 1.7330 4 +
11 1.8940 4 +
LEVELS ABOVE 1.906 MEV WERE ASSUMED TO BE OVERLAPPING.
FOR THE LEVELS WITH AN ASTERISK, THE CONTRIBUTION OF DIRECT
INELASTIC SCATTERING CROSS SECTIONS WAS CALCULATED BY THE
DWUCK-4 CODE/18/. DEFORMATION PARAMETERS (BETA2=0.0202) AND
BETA3=0.0251) WERE BASED ON THE DATA COMPILED BY RAMAN ET
AL./19/ AND SPEAR/20/, RESPECTIVELY.
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 (4.73E-04) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 185 MILLI-BARNS AT 50
KEV MEASURED BY WISSHAK ET AL./22/
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 (= 25.0) WAS DETERMINED TO REPRODUCE
ENERGY DEPENDENCE OF THE (N,2N) CROSS SECTION MEASURED BY
FREHAUT ET AL./23/
FINALLY, THE (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,P) 8.00 MB (RECOMMENDED BY FORREST/24/)
(N,ALPHA) 3.83 MB (SYSTEMATICS OF FORREST/24/)
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 = 6.295 A0 = 0.655
WS = 8.455 RS = 7.617 AS = 0.448
VSO= 7.0 RSO= 6.771 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-144 1.771E+01 5.640E-01 4.792E-01 5.691E+00 1.940E+00
60-ND-145 2.054E+01 5.120E-01 2.465E+00 4.869E+00 1.180E+00
60-ND-146 2.019E+01 5.660E-01 1.121E+00 6.714E+00 2.100E+00
60-ND-147 2.398E+01 4.850E-01 5.510E+00 5.235E+00 1.180E+00
61-PM-145 * 1.769E+01 5.411E-01 2.780E+00 4.120E+00 7.600E-01
61-PM-146 * 1.942E+01 5.387E-01 2.241E+01 3.849E+00 0.0
61-PM-147 2.192E+01 4.913E-01 4.801E+00 4.589E+00 9.200E-01
61-PM-148 2.227E+01 4.300E-01 1.420E+01 2.672E+00 0.0
62-SM-146 1.871E+01 5.117E-01 2.497E-01 5.159E+00 1.980E+00
62-SM-147 2.275E+01 4.770E-01 2.660E+00 4.823E+00 1.220E+00
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
---------------------------------------------------------------
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 5.943 FOR SM-148 AND 5.300 FOR SM-149.
REFERENCES
1) AOKI, T. ET AL.: PROC. INT. CONF. ON NUCLEAR DATA FOR BASIC
AND APPLIED SCIENCE, SANTA FE., VOL. 2, P.1627 (1985).
2) KAWAI, M. ET AL.: J. NUCL. SCI. TECHNOL., 29, 195 (1992).
3) MIZUMOTO, M. AND ZHAO, W.R.: JAERI-M 86-112, 168 (1986).
4) ZHAO, W.R. AND MIZUMOTO, M.: PRIVATE COMMUNICATION (1986).
5) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",
ACADEMIC PRESS (1984).
6) IGARASI, S. AND FUKAHORI, T.: JAERI 1321 (1991).
7) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).
8) FOSTER, D.G. JR. AND GLASGOW, D.W.: PHYS. REV., C3, 576
(1971).
9) KELLIE, J.D., HALL, S.J. AND CRAWFORD, G.I. ET AL.:
J. PHYS., A7, 1758 (1974).
10) PEREY, F.G: PHYS. REV. 131, 745 (1963).
11) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).
12) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).
13) 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).
14) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446
(1965).
15) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).
16) GRUPPELAAR, H.: ECN-13 (1977).
17) MATSUMOTO, J.: PRIVATE COMMUNICATION (1981).
18) KUNZ, P.D.: PRIVATE COMMUNICATION.
19) RAMAN, S., ET AL.: ATOM. DATA AND NUCL. DATA TABLES 36, 1
(1987)
20) SPEAR, R.H.: ATOM. DATA AND NUCL. DATA TABLE, 42, 55 (1989).
21) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).
22) WISSHAK, K., ET AL.: KFK 5067 (1992).
23) FREHAUT, J., ET AL.: SYMP. ON NEUTRON CROSS SECTIONS FROM
10-50 MEV, BNL, P.399 (1980).
24) FORREST, R.A.: AERE-R 12419 (1986).