16-S - 34
16-S - 34 FUJI E.C. EVAL-MAY87 H.NAKAMURA
DIST-SEP89 REV2-FEB94
----JENDL-3.2 MATERIAL 1631
-----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),(3,51-55),(3,91),(3,251),(4,2),(4,51-55)
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 - 480 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 2.08 B - -
CAPTURE 0.22 B 0.101 B /1/
TOTAL 2.30 B - -
MF=3 NEUTRON CROSS SECTIONS
BELOW 480KEV
NO BACKGROUND CROSS SECTION.
MT=251 MU-BAR=0.0198
ABOVE 480 KEV.
MT=1,2,4,51-55,91,102
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 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 0.3MB AT 480 KEV
BASED ON S-32 CAPTURE CROSS SECTION.
THE DISCRETE LEVEL SCHEME TAKEN FROM REF./4/:
NO. ENERGY(MEV) SPIN-PARITY
(G.S.) 0.0 0 +
1 2.127 2 +
2 3.304 2 +
3 3.914 0 +
4 4.072 1 +
5 4.115 2 +
CONTINUUM LEVELS ASSUMED ABOVE 4.5 MEV. THE LEVEL
DENSITY PARAMETERS OF ASANO ET AL./5/ ARE USED.
***** JENDL-3.2 ****************************************
MT=1,4,51-55,91,251
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 /6/, WITHOUT THE PRECOMPOUND REACTION CORRECTION.
TRANSMISSION COEFFICIENTS FOR PROTON AND ALPHA PARTICLE
ARE CALCULATED BY USING THE OMP OF BECCHETTI-GEENLEES/7/
AND HUIZENGA-IGO/8/, 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=51-55 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.: JR. NUCL. SCI. TECH., 12, 67 (1975).
3) FU, C.Y.: ATOM. DATA AND NUCL. DATA TABLES., 17, 127 (1976).
4) LEDERER, C.M. ET AL.: TABLE OF ISOTOPES. 7TH EDIT.
5) ASANO ET AL.: PRIVATE COMMUNICATION.
6) YOUNG, P.G. AND ARTHUR, E.D.: LA-6947 (1977).
7) BECCHETI, JR. AND GREENLEES, G.W.: POLARIZATION PHENOMENA
IN NUCLEAR REACTIONS, P.682 (1971).
8) HUIZENGA, JR. AND IGO, G.J.: NUCL. PHYS., 29, 462 (1962).