96-CM-246 JAERI EVAL-MAR87 Y.KIKUCHI, T.NAKAGAWA
DIST-SEP89
----JENDL-3.2 MATERIAL 9643
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 NEW EVALUATION WAS MADE BY Y.KIKUCHI (JAERI) /1/.
89-03 RE-EVALUATION FOR JENDL-3 WAS MADE BY T.NAKAGAWA(JAERI) /2/.
MF=1
MF=1 GENERAL INFORMATION
MT=451 DESCRIPTIVE DATA
MT=452 NUMBER OF NEUTRONS PER FISSION
SUM OF MT=455 AND MT=456.
MT=455 NUMBER OF DELAYED NEUTRONS
SEMI-EMPIRICAL FORMULA BY TUTTLE /3/.
MT=456 NUMBER OF PROMPT NEUTRONS PER FISSION
SEMI-EMPIRICAL FORMULA BY HOWERTON /4/.
MF=2 RESONANCE PARAMETERS
MT=151 RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (MLBW) : 1.0E-5 TO 330 EV
EVALUATION WAS BASED ON THE EXPERIMENTAL DATA /5-9/ AS
FOLLOWS:
RESONANCE ENERGIES = REFS. 6 AND 8.
NEUTRON WIDTHS = REFS. 5, 6 AND 7.
RADIATIVE WIDTHS = REFS. 6 AND 8, AND AVERAGE WIDTH
OF 0.031 EV WAS ASSUMED.
FISSION WIDTHS = REFS. 8 AND 9. WF OF 4.315-EV
LEVEL WAS ADJUSTED TO THE THERMAL CROSS
SECTION.
SCATTERING RADIUS = 9.85 FM. (ADJUSTED TO 11.1 B AT
0.0253 EV/10/)
1/V BACKGROUND DATA WERE GIVEN TO FISSION CROSS SECTION.
UNRESOLVED RESONANCE REGION : 330 EV TO 30 KEV
OBTAINED FROM OPTICAL MODEL CALCULATION:
S0=0.94E-4, S1=3.17E-4, S2=0.88E-4, R=9.15 FM.
ESTIMATED FROM RESOLVED RESONANCES:
D-OBS=31.7 EV, WG=31 MILLI-EV.
WF OBTAINED BY FITTING THE DATA OF STOPA ET AL./9/.
CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS
2200 M/SEC RES. INTEG.
TOTAL 12.51 B -
ELASTIC 11.08 B -
FISSION 0.14 B 9.90 B
CAPTURE 1.291 B 113 B
MF=3 NEUTRON CROSS SECTIONS
BELOW 30 KEV, CROSS SECTIONS WERE REPRESENTED WITH RESONANCE
PARAMETERS.
MT=1,2,4,51-79,91,102,251 TOTAL, ELASTIC AND INELASTIC
SCATTERING, CAPTURE CROSS SECTIONS AND MU-L
CALCULATED WITH OPTICAL AND STATISTICAL MODEL CODE
CASTHY/11/.
THE SPHERICAL OPTICAL POTENTIAL PARAMETERS (MEV,FM):
V =43.4-0.107*EN, R =1.282, A =0.60
WS =6.95-0.339*EN+0.0531*EN**2, RS =1.29, B =0.50
(DERIVATIVE WOODS-SAXON FORM)
VSO=7.0, RSO=1.282, ASO=0.60
THIS SET OF POTENTIAL PARAMETERS WAS DETERMINED /12/ TO
REPRODUCE WELL THE TOTAL CROSS SECTION OF AM-241 BY
PHILLIPS AND HOWE /13/.
IN THE STATISTICAL MODEL CALCULATION, COMPETING PROCESSES
OF FISSION, (N,2N), (N,3N) AND (N,4N), AND LEVEL
FLUCTUATION WERE CONSIDERED. THE LEVEL SCHEME OF CM-246
WAS TAKEN FROM REF./14/.
NO. ENERGY(KEV) SPIN-PARITY
G.S. 0 0 -
1 42.85 2 +
2 141.99 4 +
3 295.5 6 +
4 500.0 8 +
5 841.7 2 -
6 876.4 3 -
7 923.3 4 -
8 981.0 5 -
9 1051 6 -
10 1079 1 -
11 1105 2 -
12 1124 2 +
13 1128 3 -
14 1129 7 -
15 1165 3 +
16 1175 0 +
17 1179 8 -
18 1211 2 +
19 1220 4 +
20 1250 1 -
21 1289 0 +
22 1300 3 -
23 1318 2 +
24 1349 1 -
25 1367 2 -
26 1379 4 +
27 1452 1 +
28 1478 2 +
29 1509 3 +
CONTINUUM LEVELS ASSUMED ABOVE 1526 KEV.
THE LEVEL DENSITY PARAMETERS WERE TAKEN FROM GILBERT AND
CAMERON /15/. THE GAMMA-RAY STRENGTH FUNCTION OF 9.76E-4
DEDUCED FROM RESONANCE PARAMETERS.
MT=16,17,37 (N,2N), (N,3N), (N,4N) REACTION CROSS SECTIONS
CALCULATED WITH EVAPORATION MODEL/16/.
MT=18 FISSION
EVALUATED ON THE BASIS OF THE MEASURED DATA BY STOPA ET
AL./9/ AND FOMUSHKIN ET AL./17/.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2,51-79,91
LEGENDRE COEFFICIENTS WERE GIVEN BY THE OPTICAL AND
STATISTICAL MODEL CALCULATIONS.
MT=16,17,18,37
ISOTROPIC DISTRIBUTIONS IN THE LABORATORY SYSTEM.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16,17,37,91 EVAPORATION SPECTRUM
MT=18 FISSION SPECTRUM
TEMPERATURE OF 1.48 MEV WAS ESTIMATED FROM DATA OF
ZHURAVLAV ET AL. /18/ FOR CM-245 AND CM-247.
REFERENCES
1) KIKUCHI Y.: JAERI-M 83-236 (1984).
2) NAKAGAWA T.: TO BE PUBLISHED AS JAERI-M REPORT.
3) TUTTLE R.J.: INDC(NDS)-107/G+SPECIAL, 29 (1979).
4) HOWERTON R.J.: NUCL. SCI. ENG., 62, 438(1977).
5) BERRETH T.R. ET AL.: NUCL. SCI. ENG., 49, 145(1972).
6) BENJAMIN R.W. ET AL.: NUCL. SCI. ENG., 55, 440(1974).
7) BELANOVA T.S. ET AL.: SOV. AT. ENERGY, 39, 1020(1975).
8) MOORE M.S. AND KEYWORTH G.A.: PHYS. REV., C3, 1656(1971).
9) STOPA C.R.S. ET AL.: 1982 KIAMESHA, 1090 (1982), AND
MAGUIRE JR. H.T. ET AL.: NUCL. SCI. ENG., 89, 293 (1985).
10) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL.1, PART B",
ACADEMIC PRESS (1984).
11) IGARASI S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).
12) IGARASI S. AND NAKAGAWA T.: JAERI-M 8342 (1979).
13) PHILLIPS T.W. AND HOWE F.R.: NUCL. SCI. ENG., 69, 375(1979).
14) LEDERER C.M. AND SHIRLEY V.S.: TABLE OF ISOTOPES, 7TH ED.
(1978).
15) GILBERT A. AND CAMERON A.G.W.: CAN. J. PHYS., 43, 1446 (1965).
16) PEARLSTEIN S.: NUCL. SCI. ENG., 23, 238 (1965).
17) FOMSHKIN E.F. ET AL.: SOV. J. NUCL. PHYS., 31, 19(1980).
18) ZHURAVLEV K.D. ET AL.: 1973 KIEV, VOL.4, 57 (1973).