96-Cm-247
96-CM-247 JAERI EVAL-MAR89 T.NAKAGAWA, Y.KIKUCHI
DIST-MAR89
----JENDL-3.2 MATERIAL 9646
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
83-03 EVALUATION WAS BY Y.KIKUCHI(JAERI)/REF.1/.
89-03 RE-EVALUATION WAS MADE FOR JENDL-3 BY T.NAKAGAWA(JAERI)/2/.
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 PER FISSION
SEMI-EMPIRICAL FORMULA BY TUTTLE /3/.
MT=456 NUMBER OF PROMPT NEUTRONS PER FISSION
THERMAL VALUE OF ZHURAVLEV ET AL./4/ AND ENERGY DEPENDENT
TERM OF HOWERTON /5/.
MF=2 RESONANCE PARAMETERS
MT=151 RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (MLBW) : 1.0E-5 TO 60 EV
EVALUATION WAS BASED ON THE EXPERIMENTAL DATA OF MOORE AND
KEYWORTH /6/ AND BELANOVA ET AL./7/. THE PARAMETERS OF
1.25-EV LEVEL WERE TAKEN FROM MUGHAGGHAB /8/.
RADIATIVE WIDTHS = 0.040 EV WAS ASSUMED.
SCATTERING RADIUS = 9.14 FM.
A NEGATIVE RESONANCE WAS ADDED AT -0.3 EV.
UNRESOLVED RESONANCE REGION : 60 EV TO 30 KEV
PARAMETERS WERE DETERMINED WITH A FITTING CODE ASREP/9/
SO AS TO REPRODUCE THE FISSION CROSS SECTION OF MOORE AND
KEYWORTH /6/, AND THE TOTAL AND CAPTURE CROSS SECTIONS
CALCULATED WITH OPTICAL AND STATISTICAL MODELS.
ENERGY INDEPENDENT PARAMETERS:
R=9.386 FM, S2=0.86E-4, WG=0.04 EV,.
WF(4-)=0.0534 EV, WF(5-)=0.5 EV, WF(3+)=0.08 EV,
WF(4+)=0.68 EV, WF(5+)=0.05 EV, WF(6+)=0.47 EV.
WF ESTIMATED BY SYSTEMATIC SURVEY /10/
ENERGY DEPENDENT PARAMETERS AT 0.9 KEV:
S0=0.774E-4, S1=2.89E-4, D=1.397 EV.
CALCULATED 2200 M/S CROSS SECTIONS AND RESONANCE INTEGRALS
2200 M/SEC RES. INTEG.
TOTAL 147.8 B -
ELASTIC 8.775 B -
FISSION 81.79 B 612 B
CAPTURE 57.20 B 535 B
MF=3 NEUTRON CROSS SECTIONS
BELOW 30 KEV, CROSS SECTIONS WERE REPRESENTED WITH RESONANCE
PARAMETERS.
MT=1,2,4,51-60,91,102,251 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-247
WAS TAKEN FROM REF./14/.
NO. ENERGY(KEV) SPIN-PARITY
G.S. 0 9/2 -
1 61.5 11/2 -
2 133 13/2 -
3 227 5/2 +
4 266 7/2 +
5 285 7/2 +
6 317 9/2 +
7 342 9/2 +
8 404 1/2 +
9 433 3/2 +
10 449 5/2 +
CONTINUUM LEVELS ASSUMED ABOVE 479 KEV.
THE LEVEL DENSITY PARAMETERS WERE TAKEN FROM GILBERT AND
CAMERON/15/. THE GAMMA-RAY STRENGTH FUNCTION OF 2.29E-2
WAS DEDUCED FROM RESONANCE PARAMETERS.
MT=16,17,37 (N,2N), (N,3N) AND (N,4N) REACTION CROSS SECTIONS
CALCULATED WITH EVAPORATION MODEL/16/.
MT=18 FISSION
EVALUATED ON THE BASIS OF THE MEASURED DATA BY MOORE AND
KEYWORTH /6/ BELOW 50 KEV. ABOVE THIS ENERGY, THE DATA OF
FOMUSHKIN ET AL./17/ WERE ADOPTED.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2,51-60,91
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 1.47 MEV WAS ESTIMATED FROM DATA OF
ZHURAVLEV ET AL. /4/.
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) ZHURAVLEV K.D. ET AL.: 1973 KIEV, VOL.4, 57 (1973).
5) HOWERTON R.J.: NUCL. SCI. ENG., 62, 438(1977).
6) MOORE M.S. AND KEYWORTH G.A.: PHYS. REV., C3, 1656(1971)
7) BELANOVA T.S. ET AL.: SOV. AT. ENERGY, 47, 772(1979).
8) MUGHABGHAB S.F.: "NEUTRON CROSS SECTIONS, VOL.1, PART B",
ACADEMIC PRESS (1984).
9) KIKUCHI Y.: PRIVATE COMMUNICATION.
10) KIKUCHI Y. AND AN S.: J. NUCL. SCI. TECHNOL., 7, 157 (1970).
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) FOMUSHKIN E.F. ET AL.: SOV. AT. ENERGY, 62, 340 (1987).