19-K - 41
19-K - 41 FUJI E.C. EVAL-MAY87 H.NAKAMURA
DIST-SEP89 REV2-FEB94
----JENDL-3.2 MATERIAL 1931
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-05 NEWLY EVALUATED BY H.NAKAMURA (FUJI ELECTRIC CO. LTD.)
94-02 JENDL-3.2
TOTAL CROSS SECTION WAS CALCULATED BY T. WATANABE (KHI).
INELASTIC SCATTERING CROSS SECTIONS WERE CALCULATED BY
K.SHIBATA (JAERI).
DATA WERE COMPILED BY K.SHIBATA.
***** MODIFIED PARTS FOR JENDL-3.2 ****************************
(3,1),(3,4),(3,51-91),(3,251),(4,2),(4,51-52)
NEW OPTICAL AND STATISTICAL MODEL CAL.
(3,2) TOTAL - NONELASTIC
****************************************************************
MF=1 GENERAL INFORMATION
MT=451 DESCRIPTIVE DATA AND DICTIONARY
MF=2 MT=151 RESONANCE PARAMETERS:
RESOLVED RESONANCES FOR MLBW FORMULA: 1.0E-5 EV - 125 KEV
PARAMETERS ARE TAKEN FROM BNL 325 4TH EDITION /1/, AND
SOME PARAMETERS ARE ASSUMED TO FIT THE MEASURED DATA.
CROSS SECTIONS CALCULATED WITH THESE PARAMETERS ARE TO
BE CORRECTED BY ADDING MF=3, MT=1, 2 AND 102 DATA.
CALCULATED 2200-M/S CROSS SECTIONS AND RESONANCE INTEGRALS
2200-M/SEC RES. INTEG. REF.
ELASTIC 2.57 B - -
CAPTURE 1.46 B 1.58 B /1/
TOTAL 4.03 B - -
MF=3 NEUTRON CROSS SECTIONS
BELOW 125 KEV
MT=251 MU-BAR= 0.0164
ABOVE 125 KEV.
MT=1,2,4,51-,91,102
TOTAL, ELASTIC, INELASTIC AND CAPTURE CALCULATED WITH
CASTHY CODE /2/, CONSIDERING THE COMPETITION WITH THE
THRESHOLD REACTION CHANNELS.
OPTICAL POTENTIAL PARAMETERS OF C.Y.FU/3/ ARE USED.
THE SPHERICAL OPTICAL POTENTIAL PARAMETERS:
V = 46.72 VSO= 5.37 (MEV)
WS= 9.13 WV = 0.0 (MEV)
R =RSO= 1.26 RS = 1.39 (FM)
A =ASO= 0.76 B = 0.40 (FM)
MT=102 CAPTURE DATA ARE NORMALIZED TO THE EXPERIMENTAL
DATA OF 15 MB AT 150 KEV /4/ .
THE DISCRETE LEVEL SCHEME TAKEN FROM REF./5/:
NO. ENERGY(MEV) SPIN-PARITY
(G.S.) 0.0 3/2 +
1 0.9804 1/2 +
2 1.294 7/2 -
CONTINUUM LEVELS ASSUMED ABOVE 1.5 MEV. THE LEVEL
DENSITY PARAMETERS OF ASANO ET AL./6/ ARE USED.
***** JENDL-3.2 ********************************************
THE TOTAL AND INELASTIC SCATTERING CROSS SECTIONS WERE CAL-
CULATED BY USING THE OMP SET DETERMINED BY T. WATANABE.
V = 54.36 - 0.325EN (MEV)
WS= 2.258 + 0.1698EN (MEV)
VSO=3.341 (MEV)
R =1.20 ,A =0.658 (FM)
RS =1.32 ,B =0.602 (FM)
RSO=1.10 ,ASO=0.406 (FM)
THE CROSS SECTIONS OF MT=16,22,28,103,107 IN JENDL-3.1 WERE
CONSIDERED AS THE COMPETING PROCESS FOR THE STATISTICAL MODEL
CALCULATION.
************************************************************
MT=16(N,2N), 22(N,N'A), 28(N,N'P), 103(N,P), 107(N,A)
BASED ON THE STATISTICAL MODEL CALCULATIONS WITH GNASH
CODE /7/, WITHOUT THE PRECOMPOUND REACTION CORRECTION .
TRANSMISSION COEFFICIENTS FOR PROTON AND ALPHA PARTICLE
ARE CALCULATED BY USING THE OMP OF BECCHETTI-GEENLEES
/8/ AND HUIZENGA-IGO/9/, RESPECTIVELY.
LEVEL DENSITY PARAMETERS ARE BASED ON BUILT-IN VALUES.
(N,2N), (N,P) AND (N,A) CROSS SECTIONS WERE NORMALIZED
TO THE EXPERIMENTAL DATA OF ADAM+/10/ FOR (N,2N), AND OF
BASS+/11/ FOR (N,P) AND (N,A).
MT=251 MU-BAR
CALCULATED WITH OPTICAL MODEL (CASTHY).
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2 CALCULATED WITH OPTICAL MODEL (CASTHY).
MT=51-52 CALCULATED WITH HAUSER -FESHBACH FORMULA (CASTHY)
MT=16,22,28 ISOTROPIC IN THE LABORATORY SYSTEM.
MT=91 ISOTROPIC DISTRIBUTIONS IN CM WERE CONVERTED
TO THE DISTRIBUTIONS IN LAB.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16,22,28,91,103,107 EVAPORATION SPECTRA.
REFERENCES
1) MUGHABGHAB, S.F. ET AL.: NEUTRON CROSS SECTION, VOL.1 (1981).
2) IGARASI, S.: J. NUCL. SCI. TECH., 12, 67 (1975).
3) FU, C.Y.: ATOM. DATA AND NUCL. DATA TABLES., 17, 127 (1976).
4) STUPEGIA ET AL.: J. NUCL. ENERG., 22, 267 (1968).
5) LEDERER, C.M. ET AL.: TABLE OF ISOTOPES. 7TH EDIT.
6) ASANO ET AL.: PRIVATE COMMUNICATION.
7) YOUNG, P.G. AND ARTHUR, E.D.: LA-6947 (1977).
8) BECCHETI, JR. AND GREENLEES, G.W.: POLARIZATION PHENOMENA
IN NUCLEAR REACTIONS, P.682 (1971).
9) HUIZENGA, JR. AND IGO, G.J.: NUCL. PHYS., 29, 462 (1962).
10) ADAM, A. ET AL.: NUCL. PHYS., A180, 587 (1972).
11) BASS, R.ET AL.: EANDC(E)-57U, 1 (1965).