18-AR- 40 KHI EVAL-MAR94 T.WATANABE
DIST-APR94
----JENDL-3.2 MATERIAL 1837
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
94-3 NEWLY EVALUATED
MF=1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF=2 RESONANCE PARAMETERS
MT=151 RESOLVED RESONANCE PARAMETERS(BELOW 1.49774MEV)
REICH-MOORE FORMULA WAS ADOPTED. ABOVE 100KEV,BACKGROUND CROSS
SECTION WAS GIVEN TO REPRODUCE WINTERS MEASUREMENT/1/.
NEGATIVE ENERGY LEVEL PARAMETERS WERE ADJUSTED TO REPRODUCE
2200M/S CROSS SECTIONS.
EVALUATION WAS MAINLY BASED ON WINTERS/1/, MACKLINS/2/ DATA
AND MUGHABGHABS/3/ COMPILATION.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 1.307 -
ELASTIC 0.647 -
CAPTURE 0.66 0.294
MF=3 NEUTRON CROSS SECTIONS
BELOW 1.49774 MEV, RESONANCE PARAMETERS WERE GIVEN.
BELOW 5.0MEV, WINTERS TOTAL CROSS SECTION MEASUREMENT/1/ WAS
FOLLOWED. ELASTIC SCATTERING CROSS SECTION WAS RECONSTRUCTED
FROM DIFFERENCE BETWEEN TOTAL AND SUM OF OTHER PARTIAL CROSS
SECTIONS.
ABOVE 1.5 MEV, INELASTIC SCATTERING AND CAPTURE CROSS SECTION
AND ABOVE 5.0 MEV, TOTAL AND ELASTIC SCATTERING CROSS SECTION
WERE CALCULATED WITH THE OPTICAL AND STATISTICAL MODEL CODE
CASTHY/4/.
DIRECT PROCESS FOR INELASTIC SCATTERING WERE CORRECTED WITH
DWBA CODE DWUCKY/5/. THE PARAMETERS USED IN DWUCKY CALCULATION
WERE ESTIMATED FROM RAMANS/6/ COMPILATION AND HALF LIFE DATA OF
ENSDF FILE/7/.
OPTICAL MODEL PARAMETERS USED IN CASTHY CALCULATION WERE AS
FOLLOWS.
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 53.39-0.2233E , R0 = 4.4494 , A0 = 0.536
WS = 3.365+2.445E , RS = 3.7448 , AS = 0.419
WSO= 4.705 , RSO= 4.8085 , ASO= 0.6
THE LEVEL SCHEME WAS ADOPTED FROM ENSDF FILE.
NO. ENERGY(MEV) SPIN-PARITY BETA 2/3
GR. 0.0000 0 +
1 1.4609 2 + 0.25
2 2.1208 0 +
3 2.5241 2 + 0.15
4 2.8930 4 +
5 3.2083 2 + 0.2
6 3.4645 6 +
7 3.5113 1 +
8 3.5150 4 +
9 3.6810 3 - 0.25
10 3.9188 2 + 0.15
11 3.9420 1 +
12 4.0420 0 +
13 4.0829 3 - 0.2
14 4.1790 1 +
15 4.2260 4 -
16 4.2290 4 +
17 4.3012 1 -
18 4.3245 2 + 0.15
19 4.3580 1 -
20 4.4190 3 - 0.15
21 4.4270 3 +
22 4.4810 1 +
23 4.4941 5 -
24 4.5621 1 -
25 4.5780 2 +
LEVELS ABOVE 4.58 MEV WERE ASSUMED TO BE OVERLAPPING.
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GIRBERT-
CAMERON WERE ADOPTED.
SPIN CUT-OFF PARAMETER C1 WAS TAKEN AS 0.146.
AR- 40 AR- 41
-------- --------
A (MEV) 8.301 8.443
SPIN CUT-OFF PARAM. 4.920 5.044
PAIRING ENERGY (MEV) 3.260 1.620
NORMALIZATION FACTOR 628.70 655.44
E-JOINT (MEV) 9.363 6.164
THE CAPTURE CROSS SECTION WAS NORMALIZED TO REPRODUCE 1.35
MILLIBARN AT 300 KEV/2/. ABOVE 1 MEV, DIRECT/SEMIDIRECT CAPTURE
CROSS SECTION NORMALIZED TO 0.523 MB AT 14.5 MEV WERE ADDED TO
ABOVE CASTHY'S RESULTS/8/.
MT=16,17,22,28,103,104,105,106,107
(N,2N),(N,3N),(N,NA),(N,NP),(N,P),(N,D),(N,T),(N,HE-3),
(N,A)
WERE EVALUATED WITH MODIFIED EGNASH-2/9/ USING F2=1.4 AND
FOLLOWING OPTICAL POTENTIALS,
NEUTRON :SAME AS USED IN CASTHY
PROTON :PEREYS OMP/10/
DEUTRON :PEREY-PEREYS OMP/11/
TRITON :RAGAINIS OMP/12/
HE-3 :LUETZESHWABS OMP/13/
ALPHA :BOCKS OMP/14/
AND NORMALIZED TO FOLLOWING VALUES AT 14.5 MEV.
(N,NA) 2.17 MB SYSTEMATICS/15/
(N,NP) 0.06 MB SYSTEMATICS
(N,P) 16.0 MB RANAKUMARS DATA/16/
(N,D) 2.9 MB GRAYS DATA/17/
(N,A) 10.0 MB AV. OF EXP. DATA/16,18,19/
THE MU-BAR(MT=251) WAS ALSO CALCULATED WITH CASTHY.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=2,16,17,22,28,51-75,91
ELASTIC AND INELASTIC SCATTERING,(N,2N),(N,3N),(N,NA),(N,NP)
ANGULAR DISTRIBUTIONS WERE CALCULATED WITH CASTHY FOR ELA-
STICALLY AND INELASTICALLY SCATTERED NEUTRONS. THE DIRECT
INELASTIC SCATTERING CONTRIBUTION WAS EVALUATED WITH DWUCKY
PROGRAMM.
AS FOR (N,2N),(N,3N),(N,NA) AND (N,NP),ISOTROPIC DISTRIBUTION
WAS ASSUMED.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT=16,17,22,28,91
FOR (N,2N),(N,3N),(N,NA),(N,NP) AND CONTINUM INELASTIC SCATTER-
ING,SECONDARY NEUTRON ENERGY DISTRIBUTION WAS CALCULATED WITH
EGNASH-2.
REFERENCES
1)R.R.WINTERTS ET. AT., PR C43, 492(1991)
2)R.L.MACKLIN ET. AT., AAA 216, 109(1989)
3)S.F.MUGHABGHAB ET. AL., NEUTRON CROSS SECTION VOL.1 PART A
ACADEMIC PRESS(1981)
4)S.IGARASHI,T.FUKAHORI JAERI-1321 (1991)
5)N.YAMAMURO JAERI-M 88-140(1988)
6)S.RAMAN ET AL. AND 36,1(1987)
7)EVALUATED NUCLEAR STRUCTURAL FILE
8)T.NAKAGAWA CAPDIR MANUAL
9)N.YAMAMURO JAERI-M 90-006(1991)
10)F.G.PEREY PR 131, 745(1963)
11)C.M.PEREY,F.G.PEREY PR 132, 752(1963)
12)R.C.RAGAINI ET. AL. PR C2,1020(1970)
13)J.W.LUETZELSCFWAB ET.AL PR 180,1023(1964)
14)R.BOCK ET. AL. NP A92, 539(1967)
15)R.A.FORREST AERE-R 12419(1986)
16)N.RANAKUMAR ET AL. NP/A 128,333(1969)
17)P.R.GRAY ET AL. NP 62,172(1965)
18)S.KARDONSKY ET AL. PR C4,840(1971)
19)L.HUSAIN JIN 30,355(1968)