26-FE- 58 JNDC EVAL-MAR87 S.IIJIMA,H.YAMAKOSHI
DIST-SEP89 REV2-OCT93
----JENDL-3.2 MATERIAL 2637
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 EVALUATION WAS PERFORMED FOR JENDL-3.
87-05 COMPILED BY K.SHIBATA (JAERI).
93-10 JENDL-3.2.
RE-EVALUATION WAS MADE BY
T.NAKAGAWA (NDC/JAERI): RESONANCE PARAMS, CROSS SECTIONS
S.IGARASI (NEDAC): GAMMA-RAY PRODUCTION DATA BELOW 10 KEV
COMPILED BY T.NAKAGAWA
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151)
(3,1), (3,2), (3,4), (3,51-91), (3,102)
(4,16-28), (4,91) TAKEN FROM JENDL FUSION FILE
(12,102)
(15,102) BELOW 1 MEV
***********************************************************
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JENDL FUSION FILE /1/ (AS OF AUG. 1993)
EVALUATED B.YU (CIAE) AND S.CHIBA (NDC/JAERI)
COMPILED BY B.YU.
ALL OF CROSS SECTIONS WERE TAKEN FROM JENDL-3. MF=6
OF MT=16, 22, 28 AND 91 WERE CREATED WITH SINCROS-II /2/
AND F15TOB/1/ PROGRAM. KALBACH'S SYSTEMATICS /3/ WAS
USED. THE PRECOMPOUND/COMPOUND RATIO WAS TAKEN FROM THE
SINCROS-II CALCULATION.
OPTICAL-MODEL, LEVEL DENSITY AND OTHER PARAMETERS USED
IN THE SINCROS-II CALCULATION ARE DESCRIBED IN REF./2/.
LEVEL SCHEMES WERE DETERMINED ON THE BASIS OF ENSDF/4/.
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MF=1 GENERAL INFORMATION
MT=451 DESCRIPTIVE DATA AND DICTIONARY
MF=2 RESONANCE PARAMETERS
MT=151 RESOLVED RESONANCES
RESONANCE REGION = 1.0E-5 EV TO 350.0 KEV
THE MULTILEVEL BREIT-WIGNER FORMULA WAS USED. PARAMETERS
WERE DETERMINED ON THE BASIS OF DATA BY GARG ET AL./5/,
KAEPPELER ET AL./6/, ALLEN AND MACKLIN/7/.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS.
2200-M/S RES. INTEG.
ELASTIC 6.470 B -
CAPTURE 1.300 B 1.36 B
TOTAL 7.770 B -
MF=3 NEUTRON CROSS SECTIONS
BELOW 350 KEV, NO BACKGROUND CROSS SECTIONS WERE GIVEN.
ABOVE 350 KEV, THE DATA WERE EVALUATED AS FOLLOWS.
MT=1,4,51-62,91,102 TOTAL, INELASTIC AND CAPTURE
CALCULATED WITH OPTICAL AND STATISTICAL MODEL CODE CASTHY
/8/. OPTICAL POTENTIAL PARAMETERS/9/ ARE AS FOLLOWS:
V = 46.0-0.25*EN (MEV),
WS = 14.0-0.2*EN (MEV), (IN THE GAUSSIAN FORM)
WI = 0.125*E-0.0004*E**2 (MEV),
VSO= 6.0 (MEV),
R = 1.286 (FM), A0 = 0.62 (FM)
RS = 1.387 (FM), AS = 0.7 (FM)
RSO= 1.07 (FM), ASO= 0.62 (FM)
THE LEVEL SCHEME USED IS:
NO. ENERGY(MEV) SPIN-PARITY
G.S. 0.0 0 +
1. 0.8108 2 +
2. 1.6747 2 +
3. 2.0765 4 +
4. 2.1339 3 +
5. 2.2581 0 +
6. 2.6004 4 +
7. 2.7819 1 +
8. 2.8764 2 +
9. 3.0840 2 +
10. 3.1330 4 +
11. 3.2330 2 +
12. 3.2440 0 +
LEVELS ABOVE 3.389 MEV WERE ASSUMED TO BE OVERLAPPING.
THE CAPTURE CROSS SECTION WAS NORMALIZED TO 3 MB AT 500
KEV/10/. DIRECT CAPTURE CROSS SECTION WAS CALCULATED
WITH A SIMPLE FORMULA DERIVED BY BENZI AND REFFO/11/ AND
ADDED TO THE CASTHY CALCULATION.
MT=2 ELASTIC
TOTAL CROSS SECTION - SUM OF PARTIAL CROSS SECTIONS
MT=16,22,28,103,107 (N,2N),(N,N'A),(N,N'P),(N,P),(N,A)
CALCULATED WITH GNASH /12/.
MT=251 MU-BAR
CALCULATED WITH CASTHY /8/.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2,51-62
CASTHY CALCULATION
MT=16,22,28,91
APPROXIMATELY TRANSLATED FROM THE DATA IN MF=6 OF JENDL
FUSION FILE.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16,22,28,91
CALCULATED WITH GNASH.
MF=12 PHOTON MULTIPLICITIES AND TRASITION PROBABILITIES
MT=16,22,28,91,103,107
MULTIPLICITIES WERE CALCULATED WITH GNASH.
MT=51-62
TRANSITION PROBABILITIES WERE GIVEN.
MT=102
MULTIPLICITIES WERE CALCULATED FROM ENERGY BALANCE.
MF=14 PHOTON ANGULAR DISTRIBUTIONS
MT=16,22,28,51-62,91,102,103,107
ASSUMED TO BE ISOTROPIC.
MF=15 PHOTON ENERGY DISTRIBUTIONS
MT=16,22,28,91,103,107
CALCULATED WITH GNASH.
MT=102
BELOW 10 KEV, CALCULATED WITH CASTHY/8/. ABOVE 1 MEV, GNASH
CALCULATION WAS ADOPTED.
REFERENCES
1) CHIBA S. ET AL.: JAERI-M 92-027, P.35 (1992).
2) YAMAMURO N.: JAERI-M 90-006 (1990).
3) KALBACH C.: PHYS. REV., C37, 2350 (1988).
4) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE, BNL/NNDC.
5) GARG J.B. ET AL.: PHYS. REV., C18, 1141 (1978).
6) KAEPPELER F. ET AL.: NUCL. SCI. ENG., 84, 234 (1983).
7) ALLEN B.J. AND MACKLIN R.L.: J. PHYS. G., 6, 381 (1980).
8) IGARASI S. AND FUKAHORI T.: JAERI 1321 (1991).
9) YAMAKOSHI H.: JAERI 1261, P.30 (1979).
10) TROFIMOV JU.N.: ATOMNAJA ENERGIJA, 58, 278 (1985).
11) BENZI V. AND REFFO G.: CCDN/NW/10 (1969).
12) YOUNG P.G. AND ARTHUR E.D.: LA-6974 (1977).