20-Ca- 44
20-CA- 44 DEC EVAL-MAR87 M.HATCHYA(DATA ENG. CO.)
DIST-SEP89 REV2-NOV93
----JENDL-3.2 MATERIAL 2037
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 NEW EVALUATION WAS MADE TO GIVE A FULL REVISION FOR JENDL-2
DATA.
87-03 COMPILED BY T.ASAMI(NEDAC)
93-11 JENDL-3.2
DATA WERE MAINLY ADOPTED FROM JENDL FUSION FILE.
COMPILED BY T.NAKAGAWA
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(3,1), (3,2), (3,4), (3,16), (N,3N), (3,22), (3,28),
(3,51-91)
ALL ANGULAR DISTRIBUTIONS EXCEPT FOR (4,2).
ALL ENERGY DISTRIBUTIONS.
***********************************************************
-------------------------------------------------------------
JENDL FUSION FILE /1/ (AS OF NOV. 1993)
EVALUATED BY K.KOSAKO (NEDAC) AND S.CHIBA (NDC/JAERI)
COMPILED BY K.KOSAKO.
- THE INELASTIC SCATTERING CROSS SECTIONS AND ANGULAR
DISTRIBUTIONS OF INELASTICALLY SCATTERED NEUTRONS (EXCEPT
CONTINUUM INELASTIC) WERE CALCULATED WITH CASTHY2Y AND
DWUCKY IN SINCROS-II SYSTEM/2/ INCLUDING CONTRIBUTIONS
FROM DIRECT REACTIONS.
- THE (N,2N), (N,3N), (N,NA) AND (N,NP) REACTION CROSS
SECTIONS (MT=16, 17, 22, 28) WERE CALCULATED BY EGNASH2
IN THE SINCROS-II.
- ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE REPLACED
WITH THOSE CALCULATED BY EGNASH2. THE DDX'S OF THE
CONTINUUM NEUTRONS WERE CALCULATED BY KUMABE'S SYSTEMA-
TICS /3/ USING F15TOB /1/. THE PRECOMPOUND/COMPOUND
RATIO WAS CALCULATED BY THE SINCROS-II CODE SYSTEM.
- THE RESONANCE PARAMETERS, TOTAL, CAPTURE, (N,P) AND (N,A)
CROSS SECTIONS AND ANG. DISTRIBUTIONS OF ELASTICALLY
SCATTERED NEUTRONS WERE TAKEN FROM JENDL-3.1.
- 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/.
-------------------------------------------------------------
MF=1 GENERAL INFORMATION
MT=451 DESCRIPTIVE DATA AND DICTIONARY
MF=2 RESONANCE PARAMETERS
MT=151 RESOLVED RESONANCE PARAMETERS
RESOLVED PARAMETERS FOR MLBW FORMULA WERE GIVEN IN THE ENERGY
REGION FROM 1.0E-5 EV TO 500 KEV. PARAMETERS WERE TAKEN FROM
THE RECOMMENDED DATA OF BNL/5/ AND THE DATA FOR A NEGATIVE
RESONANCE WERE ADDED SO AS TO REPRODUCE THE RECOMMENDED THERMAL
CROSS SECTIONS FOR CAPTURE AND SCATTERING/5/. THE SCATTERING
RADIUS WAS ASSUMED TO BE 3.6 FERMI. CALCULATED 2200 M/SEC
CROSS SECTIONS AND RESONANCE INTEGRALS ARE AS FOLLOWS:
2200 M/S CROSS SECTION(B) RES. INTEGRAL(B)
ELASTIC 3.320
CAPTURE 0.888 0.4254
TOTAL 4.208
MF=3 NEUTRON CROSS SECTIONS
BELOW 500 KEV, ZERO BACKGROUND CROSS SECTION WAS GIVEN AND ALL
THE CROSS-SECTION DATA ARE REPRODUCED FROM THE EVALUATED
RESOLVED RESONANCE PARAMETERS WITH MLBW FORMULA.
FOR JENDL-3.2, ALL CROSS-SECTION DATA EXCEPT FOR THE TOTAL,
CAPTURE, (N,P) AND (N,A) CROSS SECTIONS WERE ADOPTED FROM JENDL
FUSION FILE. THE CALCULATION WAS MADE WITH SINCROS-II SYSTEM
/2/ BY ADOPTING WALTER-GUSS OMP MODIFIED BY YAMAMURO/2/ FOR
NEUTRON, PEREY OMP /6/ FOR PROTON, LEMOS OMP MODIFIED BY ARTHUR
AND YOUNG/7/ FOR ALPHA, LOHR-HAEBERLI OMP/8/ FOR DEUTERON,
BECCHETTII-GREENLEES OMP/9/ FOR TRITON AND HE-3, AND STANDARD
LEVEL DENSITY PARAMETERS OF SINCROS-II SYSTEM.
MT=1 TOTAL
OPTICAL AND STATISTICAL MODEL CALCULATION WAS MADE WITH THE
CASTHY CODE/10/. THE OPTICAL POTENTIAL PARAMETERS USED ARE:
V = 49.68, VSO = 7.12 (MEV)
WS = 7.76 - 0.5*EN, WV = 0 (MEV)
R = 1.17, RS = 1.09, RSO = 1.17 (FM)
A = 0.6, ASO = 0.6, B = 0.69 (FM)
MT=2 ELASTIC SCATTERING
OBTAINED BY SUBTRACTING THE SUM OF THE PARTIAL CROSS SECTIONS
FROM THE TOTAL CROSS SECTION.
MT=4, 51-59, 91 INELASTIC SCATTERING
THE CROSS SECTIONS WERE TAKEN FROM JENDL FUSION FILE. THE
LEVEL SCHEME WAS BASED ON REF./4/ CONTRIBUTIONS OF THE DIRECT
PROCESS WERE CALCULATED FOR THE LEVELS MARKED WITH '*' BY MEANS
OF DWUCKY. DEFORMATION PARAMETERS WERE ADOPTED FROM RAMAN ET
AL./11/ AND SPEAR/12/.
NO. ENERGY(MEV) SPIN-PARITY (DIRECT PROCESS)
0.0 0 +
1 1.157 2 + *
2 1.8835 0 +
3 2.2831 4 + *
4 2.6565 2 + *
5 3.0443 4 + *
6 3.2849 5 +
7 3.3013 2 +
8 3.3079 3 - *
9 3.3572 2 +
LEVELS ABOVE 3.357 MEV WERE ASSUMED TO BE OVERLAPPING.
MT=16, 17, 22, 28 (N,2N), (N,3N), (N,NA),(N,NP)
ADOPTED FROM JENDL FUSION FILE. THEORETICAL CALCULATION WAS
MADE WITH SINCROS-II. THE (N,NP) CROSS SECTION WAS NORMALIZED
TO THE EXPERIMENTAL DATA OF IKEDA ET AL./13/
MT=102 CAPTURE
CALCULATED WITH THE CASTHY CODE/10/ AND NORMALIZED TO 7.1 MB
AT 45 KEV/14/.
MT=103, 107 (N,P), (N,A)
CALCULATED WITH THE GNASH CODE/15/ USING THE SAME OPTICAL MODEL
PARAMETERS AS THE TOTAL CROSS SECTION.
MT=251 MU-BAR
CALCULATED WITH THE OPTICAL MODEL.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2
CALCULATED WITH THE CASTHY CODE/10/.
MT=51-58
TAKEN FROM JENDL FUSION FILE. CALCULATED WITH THE CASTHY AND
DWUCKY IN THE SINCROS-II SYSTEM.
MT=16, 17, 22, 28, 91
TAKEN FROM JENDL FUSION FILE, AND TRANSFORMED INTO THE LAB
SYSTEM.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16, 17, 22, 28, 91
TAKEN FROM JENDL FUSION FILE, AND TRANSFORMED INTO THE LAB
SYSTEM.
REFERENCES
1) CHIBA, S. ET AL.: JAERI-M 92-027, P.35 (1992).
2) YAMAMURO, N.: JAERI-M 90-006 (1990).
3) KUMABE, I. ET AL.: NUCL. SCI. ENG., 104, 280 (1990).
4) ENSDF: EVALUATED NUCLEAR STRUCTURE DATA FILE, BNL/NNDC.
5) MUGHABGHAB S.F. AND GARBER D.I. :"NEUTRON CROSS SECTIONS",
VOL. 1, PART B (1984).
6) PEREY, F.G.: PHYS. REV., 131, 745 (1963).
7) ARTHUR, E.D. AND YOUNG, P.G.: LA-8626-MS (1980).
8) LOHR, J.M. AND HAEBERLI W.: NUCL. PHYS., A232, 381 (1974).
9) BECCHETTI, F.D. JR. AND GREENLEES G.W.: "POLARIZATION
PHENOMENA IN NUCL. REACTIONS," UNIV. WISCONSIN PRESS, P.682
(1971).
10) IGARASI S. AND FUKAHORI T.: JAERI 1321 (1991).
11) RAMAN, S., ET AL.: ATOM. DATA AND NUCL. DATA TABLES 36, 1
(1987)
12) SPEAR, R.H.: ATOM. DATA AND NUCL. DATA TABLE, 42, 55 (1989).
13) IKEDA Y. ET AL.: JAERI 1312 (1988).
14) MUSGROVE A.R.DE L. ET AL.: NUCL. PHYS., A279, 317 (1977).
15) YOUNG P.G. AND ARTHUR E.D. : LA-6947 (1977).