11-Na- 23
11-NA- 23 SRI EVAL-MAR87 H.YAMAKOSHI(SHIP RESEARCH INST.)
DIST-SEP89 REV2-NOV93
----JENDL-3.2 MATERIAL 1125
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 NEW EVALUATION WAS MADE FOR JENDL-3.
89-08 THE DATA FOR MF=15,MT=102 MODIFIED.
93-11 JENDL-3.2
MF=3,MT=1: MODEFIED BY T.FUKAHORI(JAERI)
MF=4,MT=91: CHANGED TO LAB. SYSTEM BY T.NAKAGAWA(JAERI)
GAMMA-RAY PART: MODEFIED BY T.ASAMI(DATA ENG. CO. LTD.)
***** MODIFIED PARTS FOR JENDL-3.2 ********************
( 3, 1) LARSON'S DATA/1/ ABOVE 1 MEV
( 3, 2) ACCORDING TO (3,1) ABOVE 1 MEV
(3,16),(3,22),(3,51),(3,103),(3,107) AROUND THRESHOLD
ENERGIES.
( 4, 91) CHANGED TO LAB. SYSTEM
(12,51-61) UPPER ENERGY LIMIT: 6.26 MEV
(12,62-67) ADDED
(12,102) FROM ENERGY BALANCE
UPPER ENERGY LIMIT: 6.26 MEV
(12,103) UPPER ENERGY LIMIT: 6.26 MEV
(13, 3) LOWER ENERGY LIMIT: 6.26 MEV
(14,62-67) ADDED
(15,102) RECALCULATION BY CASTHY AT 1.0E-5,0.0253 EV.
***********************************************************
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 350 KEV. PARAMETERS WERE MAINLY TAKEN
FROM THE RECOMMENDED DATA OF BNL /2/, AND THE DATA FOR SOME
LEVELS WERE MODIFIED SO THAT THE CALCULATED TOTAL CROSS SEC-
TIONS FOR NA-23 WERE FITTED TO THE EXPERIMENTAL DATA. THE
SCATTERING RADIUS WAS ASSUMED TO BE 5.2 FERMI. CALCULATED 2200
M/SEC CROSS SECTIONS AND RESONANCE INTEGRALS ARE AS FOLLOWS:
2200 M/S CROSS SECTION(B) RES. INTEGRAL(B)
ELASTIC 3.024
CAPTURE 0.531 0.3122
TOTAL 3.555
MF=3 NEUTRON CROSS SECTIONS
BELOW 350 KEV, BACKGROUND CROSS SECTION WAS GIVEN FOR THE TOTAL
AND ELASTIC SCATTERING CROSS SECTIONS. THE CROSS-SECTION DATA
ARE REPRODUCED FROM THE EVALUATED RESOLVED RESONANCE PARAMETERS
WITH MLBW FORMULA. ABOVE 350 KEV, THE TOTAL AND PARTIAL CROSS
SECTIONS WERE GIVEN POINTWISE.
MT=1 TOTAL
IN THE ENERGIES BETWEEN 350 KEV AND 14 MEV, EVALUATED BASED ON
THE EXPERIMENTAL DATA OF CIERJACKS/3/ IN TRACING THEIR FINE
STRUCTURES. ABOVE 14 MEV, BASED ON THE EXPERIMENTAL DATA OF
LANGSFORD/4/, STOLER/5/ AND LARSON/1/. MODEFICATION WAS DONE BY
T.FUKAHORI(JAERI) TO BE BASED ON THE EXPERIMENTAL DATA OF ONLY
LARSON/1/ ABOVE 1 MEV.
MT=2 ELASTIC SCATTERING
OBTAINED BY SUBTRACTING THE SUM OF THE PARTIAL CROSS SECTIONS
FROM THE TOTAL CROSS SECTION.
MT=4, 51-77, 91 INELASTIC SCATTERING
BELOW 5 MEV, THE INELASTIC SCATTERING CROSS SECTION TO THE 1ST
LEVEL(MT=51) WAS EVALUATED BASED ON THE EXPERIMENTAL DATA OF
TOWLE AND GILBOY/6/, CHRIEN AND SMITH/7/, AND LIND AND DAT/8/.
BELOW 5 MEV, THE INELASTIC SCATTERING CROSS SECTION TO THE 2ND
AND 3RD LEVEL(MT=52, 53) WAS EVALUATED BASED ON THE EXPERIMENTAL
DATA OF FREEMAN AND MONTAGUE/9/, LIND AND DAT/8/, AND TOWLE AND
OWENS/10/. FOR THE INELASTIC SCATTERING CROSS SECTIONS TO THE
1ST TO 3RD LEVELS ABOVE 5 MEV AND THE OTHER INELASTIC SCATTERING
DATA, OPTICAL AND STATISTICAL MODEL CALCULATIONS WERE MADE WITH
THE CASTHY CODE/11/, TAKING ACCOUNT OF THE CONTRIBUTION FROM THE
COMPETING PROCESSES. THE DIRECT COMPONENT WAS CALCULATED WITH
WITH THE DWUCK CODE/12/ FOR FIVE LOWEST LEVELS. THE DEFORMATION
PARAMETERS WERE ESTIMATED BASED ON A WEAK COUPLING MODEL. THE
OPTICAL POTENTIAL PARAMETERS USED ARE:
V = 46.0 - 0.25*EN, VSO = 6.0 (MEV)
WS = 14.0 - 0.2*EN, WV = 0.125*EN (MEV)
R = 1.286, RS = 1.39, RSO = 1.07 (FM)
A = 0.62, ASO = 0.62, B = 0.7 (FM)
THE LEVEL DATA USED IN THE ABOVE TWO CALCULATIONS WERE TAKEN
FROM REF./13/ AS FOLLOWS:
MT LEVEL ENERGY(MEV) SPIN-PARITY
0.0 3/2+
51 0.4399 5/2+
52 2.0764 7/2+
53 2.3909 1/2+
54 2.6398 1/2-
55 2.7037 9/2+
56 2.9824 3/2+
57 3.6783 3/2-
58 3.8480 5/2-
59 3.9147 5/2+
60 4.4320 1/2+
61 4.7756 7/2+
62 5.3800 3/2+
63 5.5360 11/2+
64 5.7410 3/2+
65 5.7660 5/2+
66 5.9310 1/2-
67 5.9670 3/2-
68 6.0430 1/2-
69 6.1170 11/2+
70 6.1910 11/2+
71 6.2360 13/2+
72 6.3080 1/2+
73 6.3506 9/2-
74 6.5770 5/2+
75 6.6170 9/2+
76 6.7340 3/2+
77 6.8680 5/2+
LEVELS ABOVE 6.9 MEV WERE ASSUMED TO BE OVERLAPPING.
MT=16 (N,2N)
MAINLY BASED ON THE EXPERIMENTAL DATA OF ADAMSKI/14/.
MT=22 (N,NA)
CALCULATED WITH THE GNASH CODE/15/ AND NORMALIZED TO THE
EXPERIMENTAL DATA OF WOELFER/16/ AT 16.4 MEV.
MT=28 (N,NP)
CALCULATED WITH THE GNASH CODE/15/.
MT=102 CAPTURE
CALCULATED WITH THE CASTHY CODE/11/ AND NORMALIZED TO 0.3 MB
AT 500 KEV.
MT=103 (N,P)
BELOW 10 MEV, BASED ON THE EXPERIMENTAL DATA/17,18/.
ABOVE 10 MEV, CALCULATED WITH THE GNASH CODE/15/ AND NORMALIZ-
ED TO CONNECT SMOOTHLY WITH THE DATA BELOW 10 MEV.
MT=107 (N,A)
BELOW 12 MEV, BASED ON THE EXPERIMENTAL DATA/17,18/.
ABOVE 12 MEV, CALCULATED WITH THE GNASH CODE/15/ AND NORMALIZ-
ED TO CONNECT SMOOTHLY WITH THE DATA BELOW 10 MEV.
MT=251 MU-BAR
CALCULATED WITH THE OPTICAL MODEL.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2
CALCULATED WITH THE CASTHY CODE/11/.
MT=51-77
CALCULATED WITH THE CASTHY CODE/11/ AND THE DWUCK CODE/7/.
MT=91
CALCULATED WITH THE CASTHY CODE/11/ AND TRANSFORMED INTO THE
LABORATORY SYSTEM.
MT=16, 22, 28
ASSUMED TO BE ISOTROPIC IN THE LABORATORY SYSTEM.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16, 22, 28, 91
CALCULATED WITH THE GNASH CODE/15/.
MF=12 PHOTON PRODUCTION MULTIPLICITIES
MT=51-67,102,103
CALCULATED WITH THE GNASH CODE.
FOR THE JENDL-3.2, MODIFICATIONS WERE DONE FOR ENERGY BALANCE
AND FOR CHANGING UPPER ENERGY LIMIT FROM 5.21937 MEV TO 6.26325
MEV.
MF=13 PHOTON PRODUCTION CROSS SECTIONS
MT=3
CALCULATED WITH THE GNASH CODE/15/.
FOR THE JENDL-3.2, LOWER ENERGY LIMIT WAS CHANGED TO 6.26325
MEV, ACCORDING TO MF=12 MODIFICATION.
MF=14 PHOTON ANGULAR DISTRIBUTIONS
MT=3,51-67,102,103
ASSUMED TO BE ISOTROPIC IN THE LABORATORY SYSTEM.
MF=15 CONTINUOUS PHOTON ENERGY SPECTRA
MT=3,103
CALCULATED WITH THE GNASH CODE/15/.
MT=102
CALCULATED WITH THE GNASH CODE/15/ AND MODIFIED AT THERMAL
BASED ON THE EXPERIMENTAL DATA OF MAERKER/19/ AND CASTHY
CALCULATION.
REFERENCES
1) LARSON D.C. ET AL. : ORNL-TM-5614 (1976).
2) MUGHABGHAB S.F. AND GARBER D.I. :"NEUTRON CROSS SECTIONS",
VOL. 1, PART B (1984).
3) CIERJACKS S. ET AL. : KFK-1000 (1969).
4) LANGSFORD A. ET AL. : 1965 ANTWERP CONF. 529 (1965).
5) STOLER P. ET AL. : 1971 KNOXVILLE CONF. VOL.1, 311 (1971).
6) TOWLE J.H. AND GILBOY W.B. : NUCL. PHYS. 32, 610 (1962).
7) CHRIEN J.P. AND SMITH A.B. : NUCL. SCI. ENG. 26, 500 (1966).
8) LIND D.A. AND DAY R.B. : ANN. PHYS. 12, 485 (1961).
9) FREEMAN J.M. AND MONTAGUE J.H. : NUCL. PHYS. 9, 181 (1958).
10) TOWLE J.H. AND OWENS R.O. : NUCL. PHYS. A100, 257 (1967).
11) IGARASI S. AND FUKAHORI T.: JAERI 1321 (1991).
12) KUNZ P.D. : UNPUBLISHED.
13) ENSDF(EVALUATED NUCLEAR STRUCTURE DATA FILE)
14) ADAMSKI L. ET AL. : ANNA. NUCL. ENER. 7, 397 (1980).
15) YOUNG P.G. AND ARTHUR E.D. : LA-6947 (1977).
16) WOELFER G. ET AL. : Z. PHYS. 194, 75 (1966).
17) WILLIAMSON C.F. : PHYS. REV. 122, 1877 (1961).
18) BASS R. ET AL. : 1965 ANTWERP CONF. 495 (1966).
19) MAERKER R.E. : ORNL-TM-5203 (1976).