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64-Gd-155 NEA RCOM-JUL86 SCIENTIFIC COORDINATION GROUP
JEF/DOC- 8 DIST-JAN09 20090105
----JEFF-311 MATERIAL 6434
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
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** Original data taken from: JEFF-3.1 **
** **
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***************************** JEFF-3.1 *************************
** **
** Original data taken from: JEFF-3.0 **
** **
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***************************** JEFF-3.0 ***********************
DATA TAKEN FROM :- JEF-2.2 (DIST-JAN92)
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* JEF-2 *
* DATA WERE TAKEN FROM JENDL-2 *
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* 22-MAR-88: FOR THE SPIN OF L=0,RESONANCES HAVE BEEN RANDOMLY
* ASSIGNED BY THE COMPUTER CODE RNDSPIN.
* 27-APR-89: MISSING CHARGE PARTICLE PRODUCTION DATA INCLUDED
* FROM REAC-ECN-4 LIBRARY
* 3-JAN-91: AVERAGE SPIN VALUES FOR L=0 CORRECTED WITH COMPUTER
* CODE RNDSPIN.
******************************************************************
HISTORY
84-10 NEW EVALUATION FOR JENDL-2 WAS COMPLETED BY JNDC FPND W.G.
85-10 COMMENTS WERE ADDED.
MF=1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF=2 RESONANCE PARAMETERS
MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS
RESOLVED RESONANCE PARAMETERS FOR MLBW FORMULA (BELOW 181.8 EV)
EVALUATION WAS MADE BY ZUKERAN /1/. PARAMETERS OF 3 LEVELS
BELOW 2.6 EV WERE TAKEN FROM THE DATA OF MOLLER ET AL. /2/.
THOSE ABOVE 3.6 EV WERE BASED ON THE MEASURED DATA BY
FRIESENHAHN ET AL. /3/ AND BY RIBON /4/. THE AVERAGE
RADIATIVE CAPTURE WIDTH OF 0.12865 EV WAS ASSUMED.
UNRESOLVED RESONANCE PARAMETERS (0.1818 - 100 KEV)
THE PARAMETERS WERE DETERMINED TO REPRODUCE THE CAPTURE CROSS
SECTION CALCULATED WITH CASTHY /5/. THE EFFECTIVE SCATTERING
RADIUS WAS OBTAINED FROM FITTING TO THE CALCULATED TOTAL CROSS
SECTION AT 100 KEV.
TYPICAL VALUES OF THE PARAMETERS AT 70 KEV:
S0 = 3.00E-4, S1 = 3.70E-4, S2 = 1.00E-4, SG = 578.E-4,
R = 3.589 FM, D-OBS = 2.08 EV.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 60950 -
ELASTIC 58.79 -
CAPTURE 60890. 1550.
MF=3 NEUTRON CROSS SECTIONS
BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.
ABOVE 100 KEV, THE TOTAL, ELASTIC AND INELASTIC SCATTERING, AND
CAPTURE CROSS SECTIONS WERE CALCULATED WITH THE OPTICAL AND
STATISTICAL MODEL CODE CASTHY /5/. THE FOLLOWING POTENTIAL
PARAMETERS WERE DETERMINED BY IIJIMA ET AL. /6/ TO REPRODUCE
A SYSTEMATIC TREND OF THE TOTAL CROSS SECTION.
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 38.0 R0 = 7.4392 A0 = 0.47
WS = 8.0+0.5*SQRT(E) RS = 7.4392 AS = 0.52
WSO= 7.0 RSO= 7.4392 ASO= 0.47
THE LEVEL SCHEME WAS EVALUATED BY MATSUMOTO /7/.
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 3/2 -
1 0.0600 5/2 -
2 0.0865 5/2 +
3 0.1053 3/2 +
4 0.1076 9/2 +
5 0.1180 7/2 +
6 0.1215 11/2 -
7 0.1461 7/2 -
8 0.2143 13/2 +
9 0.2352 3/2 +
10 0.2510 9/2 -
11 0.2667 5/2 +
12 0.2686 3/2 +
13 0.2869 3/2 -
14 0.3215 5/2 -
15 0.3260 5/2 +
16 0.3677 1/2 +
17 0.3900 11/2 -
18 0.3930 7/2 -
19 0.4225 1/2 -
20 0.4272 3/2 +
21 0.4513 3/2 -
22 0.4870 5/2 -
23 0.4888 5/2 +
24 0.5330 13/2 -
25 0.5560 7/2 -
26 0.5599 1/2 -
27 0.5924 3/2 -
28 0.6155 3/2 -
29 0.6170 9/2 -
LEVELS ABOVE 0.648 MEV WERE ASSUMED TO BE OVERLAPPING.
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GIRBERT-
CAMERON WERE EVALUATED BY IIJIMA ET AL. /8/. THE COEFFICIENT
OF SPIN CUT-OFF PARAMETER C1 WAS TAKEN AS 0.146. THE ENERGY
DEPENDENCE OF SPIN CUT-OFF PARAMETER IN THE ENERGY RANGE BELOW
E-JOINT IS DUE TO GRUPPELAAR /9/.
GD-155 GD-156
-------- --------
PAIRING ENERGY (MEV) 0.970 1.890
A (1/MEV) 25.000 22.540
SPIN CUT-OFF PARAM. 21.064 20.087
NUCLEAR TEMP. (MEV) 0.502 0.520
C (1/MEV) 18.230 1.670
E-JOINT (MEV) 5.643 6.286
THE GAMMA-RAY STRENGTH FUNCTION (= 1284.E-4) WAS ADJUSTED TO
REPRODUCE THE EXPERIMENTAL CAPTURE CROSS SECTION OF 1520 MILLI-
BARNS AT 100 KEV MEASURED BY KONONOV ET AL. /10/ AND MIZUMOTO
ET AL. /11/.
THE MU-BAR(MT=251) WAS ALSO CALCULATED WITH CASTHY.
MF=4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
ANGULAR DISTRIBUTIONS WERE CALCULATED WITH CASTHY /5/ FOR ELA-
STICALLY AND INELASTICALLY SCATTERED NEUTRONS. THE LEGENDRE
POLYNOMIAL COEFFICIENTS ARE GIVEN IN THE CENTER-OF-MASS SYSTEM
FOR MT=2 AND DISCRETE INELASTIC LEVELS, AND IN THE LABORATORY
SYSTEM FOR MT=91.
MF=5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
EVAPORATION SPECTRUM WAS GIVEN FOR INELASTICALLY SCATTERED
NEUTRONS FROM OVERLAPPING LEVELS.
REFERENCES
1) ZUKERAN, A.: TO BE PUBLISHED AS JAERI-M REPORT.
2) MOLLER, H.B., ET AL.: NUCL. SCI. ENG., 8, 183 (1960).
3) FRIESENHAHN, S.J., ET AL.: NUCL. PHYS., A146, 337 (1970).
4) RIBON, P.: CEA-N-1149 (1969).
5) IGARASI, S.: J. NUCL. SCI. TECHNOL., 12, 67 (1975).
6) IIJIMA, S., KAWAI, M.: J. NUCL. SCI. TECHNOL., 20, 77 (1983).
7) MATSUMOTO, J.: PRIVATE COMMUNICATION (1981).
8) IIJIMA, S., ET AL.: J. NUCL. SCI. TECHNOL. 21, 10 (1984).
9) GRUPPELAAR, H.: ECN-13 (1977).
10) KONONOV, V.N., ET AL.: "PROC. 2ND NATIONAL SOVIET CONF. ON
NEUTRON PHYSCIS, KIEV 1973", VOL.2, 206 (1974).
11) MIZUMOTO, M., ET AL.: JAERI-M 84-182, 75 (1984).
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