16-S - 33
16-S - 33 FUJI E.C. EVAL-MAY87 H.NAKAMURA
DIST-SEP89 REV2-FEB94
----JENDL-3.2 MATERIAL 1628
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-05 NEWLY EVALUATED BY H.NAKAMURA (FUJI ELECTRIC CO. LTD.)
94-02 JENDL-3.2
NEW OPTICAL MODEL CALCULATION WAS PERFORMED BY T. WATANABE
(KHI).
DATA WERE COMPILED BY K. SHIBATA (JAERI).
***** MODIFIED PARTS FOR JENDL-3.2 ******************
(3,1),(3,4),(3,51-57),(3,91),(3,251),(4,2),(4,51-57)
OPTICAL AND STATISTICAL MODEL CALCULATIONS.
(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 - 260 KEV
PARAMETERS ARE TAKEN FROM BNL325 4TH EDITION/1/, AND
C.WAGEMANS AND H.WEIGMANN/2/.
CROSS SECTIONS CALCULATED WITH THESE PARAMETERS ARE TO
BE CORRECTED 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 2.84 B - /1/
CAPTURE 0.35 B 0.164 B /1/
TOTAL 3.36 B - -
MF=3 NEUTRON CROSS SECTIONS
BELOW 260 KEV
BACKGROUND CROSS SECTIONS ARE GIVEN FOR MT=1:
MT=1 0.171B : 0.002(N,P) + 0.169(N,A) B
MT=103 (N,P) 0.0016 B, BASED ON 2200-M/S DATA /1/.
MT=107 (N,A) 0.169 B, SAME TO THE ABOVE.
MT=251 MU-BAR = 0.0210
ABOVE 260 KEV.
MT=1,2,4,51-57,91,102
TOTAL, ELASTIC, INELASTIC AND CAPTURE CROSS SECTIONS
CALCULATED WITH CASTHY CODE /3/, CONSIDERING THE
COMPETITION WITH THE THRESHOLD REACTION CHANNELS.
OPTICAL POTENTIAL PARAMETERS OF C.Y.FU/4/ ARE ADJUSTED
TO REPRODUCE THE FOLLOWING EXPERIMENTAL DATA:
MT=1 TOTAL -
MT=2 ELASTIC CROSS SECTIONS OF S-32.
MT=4 INELASTIC -
THE SPHERICAL OPTICAL POTENTIAL PARAMETERS :
V = 38.0 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 0.5 MB AT 260 KEV
BASED ON S-32 CAPTURE CROSS SECTIONS.
THE DISCRETE LEVEL SCHEME TAKEN FROM REF./5/:
NO. ENERGY(MEV) SPIN-PARITY
(G.S.) 0.0 3/2 +
1 0.8404 1/2 +
2 1.966 5/2 +
3 2.313 3/2 +
4 2.866 5/2 +
5 2.934 7/2 -
6 2.969 7/2 +
7 3.220 3/2 -
CONTINUUM LEVELS ARE ASSUMED ABOVE 3.6MEV. THE LEVEL
DENSITY PARAMETERS OF ASANO ET AL./6/ ARE USED.
***** JENDL-3.2 ****************************************
MT=1,4,51-57,91,251
OPTICAL AND STATISTICAL MODEL CALCULATION
WAS PERFORMED BY USING THE OMP SET GIVEN AS FOLLOWS:
V = 58.83 - 0.5635EN (MEV)
WS = 3.609 + 0.1819EN (MEV)
VSO= 4.199 (MEV)
R = 1.306, A = 0.452 (FM)
RS = 1.124, B = 0.690 (FM)
RSO= 1.010, ASO= 0.750 (FM).
*********************************************************
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 PARTICLES
ARE CALCULATED BY USING THE OMP OF BECCHETTI-GEENLEES/8/
AND HUIZENGA-IGO/9/, RESPECTIVELY.
LEVEL DENSITY PARAMETERS ARE BASED ON BUILT-IN VALUES.
MT=251 MU-BAR
CALCULATED WITH OPTICAL MODEL (CASTHY).
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2 CALCULATED WITH OPTICAL MODEL (CASTHY).
MT=51-57 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) WAGEMANS, C. AND WEIGMAN, H.: GRENOBLE-CONF., 462 (1981).
3) IGARASI, S.: J. NUCL. SCI. TECH., 12, 67 (1975).
4) FU, C.Y.: ATOM.DATA AND NUCL. DATA TABLES, 17, 127 (1976).
5) LEDRER, 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).