62-Sm-149
62-SM-149 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-NOV90
----JENDL-3.2 MATERIAL 6240
-----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 0.52 KEV
PARAMETERS WERE BASED ON JENDL-2 WHICH WERE EVALUATED BY
KIKUCHI ET AL./3/ AS FOLLOWS: PARAMETERS OF THE LOWEST 2
LEVELS WERE EVALUATED ON THE BASIS OF DATA MEASURED BY AKYUEZ
ET AL./4/, ASAMI ET AL./5/ AND PATTENDEN/6/. THE DATA OF
MIZUMOTO/7/ WERE ADOPTED FOR OTHER RESONANCES. THE J VALUES
WERE DETERMINED ACCORDING TO MARSHAK/8/, CAUVIN ET AL./9/,
KARZHAVINA ET AL./10/ AND BECVAR ET AL./11/ RADIATION WIDTHS
HAVE BEEN MEASURED FOR SEVEN RESONANCES AND THEIR AVERAGE
VALUE OF 62 MEV WAS USED AS A RECOMMENDED VALUE.
FOR JENDL-3, TOTAL SPIN J OF SOME RESONANCES WAS
TENTATIVELY ESTIMATED WITH A RANDOM NUMBER METHOD. THE
PARAMETERS OF THE 1ST LEVEL WERE MODIFIED SO AS TO REPRODUCE
THE THERMAL CAPTURE CROSS SECTION AND RESONANCE INTEGRAL/12/.
UNRESOLVED RESONANCE REGION : 0.52 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTIONS, S0 AND S1 WERE BASED ON THE
COMPILATION OF MUGHABGHAB/12/, AND S2 WAS CALCULATED WITH
OPTICAL MODEL CODE CASTHY/13/. 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 = 4.600E-4, S1 = 0.300E-4, S2 = 4.900E-4, SG = 487.E-4,
GG = 0.062 EV, R = 7.900 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 40330 -
ELASTIC 175.8 -
CAPTURE 40150 3490
(N,ALPHA) 0.0308
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/14/ 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/15/, KELLIE ET AL./16/ AND SO ON,
AND THE S-WAVE NEUTRON STRENGTH FUNCTION OF (4.6+-0.6)E-4/12/.
THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/17/
ALPHA = HUIZENGA AND IGO/18/
DEUTERON = LOHR AND HAEBERLI/19/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/20/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/21/ WERE EVALUATED BY IIJIMA ET AL./22/ 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
/23/.
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./24/.
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 7/2 -
1 0.0225 5/2 -
2 0.2770 5/2 -
3 0.2859 9/2 -
4 0.3500 3/2 -
5 0.3990 1/2 -
6 0.5285 3/2 -
7 0.5584 5/2 -
8 0.5909 9/2 -
9 0.6060 3/2 -
10 0.6364 7/2 -
LEVELS ABOVE 0.65 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/25/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (324.E-4) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 1200 MILLI-BARNS AT 50
KEV MEASURED BY MACKLIN/26/.
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 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) 8.10 MB (SYSTEMATICS OF FORREST/27/)
(N,ALPHA) 3.02 MB (SYSTEMATICS OF FORREST)
THE (N,ALPHA) CROSS SECTION BELOW 0.52 KEV WAS CALCULATED FROM
RESONANCE PARAMETERS, BY ASSUMING A MEAN ALPHA WIDTH OF
4.82E-8 EV SO AS TO REPRODUCE THE THERMAL CROSS SECTION/12/.
THE CROSS SECTION WAS AVERAGED IN SUITABLE ENERGY INTERVALS.
ABOVE 0.52 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 FROM OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 43.42-0.1879E R0 = 7.184 A0 = 0.6
WS = 9.875-0.0019E RS = 7.072 AS = 0.45
VSO= 7.0 RSO= 7.184 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-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
60-ND-148 2.359E+01 5.150E-01 1.328E+00 6.751E+00 2.170E+00
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
61-PM-149 2.377E+01 4.890E-01 8.141E+00 5.075E+00 9.900E-01
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
62-SM-150 2.362E+01 5.230E-01 1.520E+00 6.973E+00 2.210E+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 5.300 FOR SM-149 AND 5.475 FOR SM-150.
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.: PROC. INT. CONF. ON NUCLEAR DATA FOR SCIENCE
AND TECHNOLOGY, MITO, P. 569 (1988).
3) KIKUCHI, Y. ET AL.: JAERI-M 86-030 (1986).
4) AKYUEZ, OE.R., ET AL.: CNAEM-52 (1968).
5) ASAMI, T., ET AL.: J. PHYS. SOC. JPN., 26, 225 (1969).
6) PATTENDEN, N.J.: NUCL. SCI. ENG., 17, 371 (1963).
7) MIZUMOTO, M.: NUCL. PHYS., A357, 90 (1981).
8) MARSHAK, H., ET AL.: PHYS. REV., 128, 1287 (1967).
9) CAUVIN, B., ET AL.: "PROC. 3RD CONF. ON NEUTRON CROSS SECTIONS
AND TECHNOL., KNOXVILLE 1971", 785.
10) KARZHAVINA, E.N., ET AL. JINER-P3-6237 (1972).
11) BECVAR, F., ET AL.: NUCL. PHYS., A236, 173 (1974).
12) MUGHABGHAB, S.F.: "NEUTRON CROSS SECTIONS, VOL. I, PART B",
ACADEMIC PRESS (1984).
13) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).
14) IIJIMA, S. ET AL.: JAERI-M 87-025, P. 337 (1987).
15) FOSTER, D.G. JR. AND GLASGOW, D.W.: PHYS. REV., C3, 576
(1971).
16) KELLIE, J.D., HALL, S.J. AND CRAWFORD, G.I. ET AL.:
J. PHYS., A7, 1758 (1974).
17) PEREY, F.G: PHYS. REV. 131, 745 (1963).
18) HUIZENGA, J.R. AND IGO, G.: NUCL. PHYS. 29, 462 (1962).
19) LOHR, J.M. AND HAEBERLI, W.: NUCL. PHYS. A232, 381 (1974).
20) 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).
21) GILBERT, A. AND CAMERON, A.G.W.: CAN. J. PHYS., 43, 1446
(1965).
22) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).
23) GRUPPELAAR, H.: ECN-13 (1977).
24) LEDERER, C.M., ET AL.: "TABLE OF ISOTOPES, 7TH ED.", WILEY-
INTERSCIENCE PUBLICATION (1978).
25) BENZI, V. AND REFFO, G.: CCDN-NW/10 (1969).
26) MACKLIN, R.: TAKEN FROM EXFOR 12966 (1986).
27) FORREST, R.A.: AERE-R 12419 (1986).