43-Tc- 99
43-TC- 99 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-SEP90 REV2-NOV93
----JENDL-3.2 MATERIAL 4331
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/
90-03 MODIFICATION FOR JENDL-3 WAS MADE/2/.
93-11 JENDL-3.2 WAS MADE BY JNDC FPND W.G.
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) RESOLVED RESONANCE PARAMETERS
***********************************************************
MF = 1 GENERAL INFORMATION
MT=451 COMMENTS AND DICTIONARY
MF = 2 RESONANCE PARAMETERS
MT=151 RESOLVED AND UNRESOLVED RESONANCE PARAMETERS
RESOLVED RESONANCE REGION (MLBW FORMULA) : BELOW 4.219 KEV
RESONANCE PARAMETERS WERE TAKEN FROM JENDL-2 WITH SLIGHT
MODIFICATION.
EVALUATION FOR JENDL-2 WAS MADE BY KIKUCHI /3/.
PARAMETERS OF THE 1ST AND 2ND RESONANCES WERE ADOPTED FROM
RECOMMENDED VALUES OF FISCHER ET AL./4/, AND SLIGHTLY
ADJUSTED SO AS TO REPRODUCE THE CAPTURE CROSS SECTION OF
20+-1 BARNS AT 0.0253 EV AND THE RESONANCE INTEGRAL OF
340+-20 BARNS /5/. PARAMETERS OF LEVELS BETWEEN 40 EV AND
1.5 KEV WERE EVALUATED ON THE BASIS OF DATA MEASURED BY
ADAMCHUK ET AL. /6/ AND BY LITTLE AND BLOCK/7/. IN THE
ENERGY RANGE FROM 1.0 TO 2.6 KEV, ARTIFICIAL LEVELS WERE
GENERATED WITH STAT /8/ BY ASSUMING D=0.04 EV, S0= 0.17E-4,
S1=11.12E-4 AND THE AVERAGE RADIATION WIDTH OF 0.17 EV. FOR
THE RESONANCES OF WHICH ENERGY WAS ONLY MEASURED BY LITTLE
AND BLOCK, THEIR PARAMETERS WERE ALSO ESTIMATED WITH STAT.
ABOVE 2.66 KEV, EVALUATION WAS BASED ON THE CAPTURE AREAS
MEASURED BY MACKLIN /9/. SCATTERING RADIUS WAS TAKEN FROM
THE COMPILATION OF MUGHABGHAB ET AL./5/
FOR JENDL-3, TOTAL SPIN J OF SOME RESONANCES WAS TENTATIVE-
LY ESTIMATED WITH A RANDOM NUMBER METHOD. IN THIS PROCEDURE,
NEUTRON WIDTHS FOR RESONANCES ABOVE 2.66 KEV WERE DETERMINED
TO REPRODUCE THE CAPTURE AREAS MEASURED BY MACKLIN/9/.
FOR JENDL-3.2, NEUTRON OR RADIATIVE CAPTURE WIDTHS FOR
LEVELS BETWEEN 111 EV AND 754 EV WERE MODIFIED SO AS TO
REPRODUCE THE CAPTURE AREA MEASURED BY LITTLE AND BLOCK/7/.
UNRESOLVED RESONANCE REGION : 4.219 KEV - 100 KEV
UNRESOLVED RESONANCE PARAMETERS WERE ADOPTED FROM JENDL-2.
THE PARAMETERS WERE ADJUSTED TO REPRODUCE THE CAPTURE CROSS
SECTION MEASURED BY MACKLIN /9/. 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 = 0.414E-4, S1 = 4.241E-4, S2 = 0.488 E-4, SG = 90.4E-4,
GG = 0.186 EV, R = 6.215 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 23.063 -
ELASTIC 3.422 -
CAPTURE 19.641 312
MF = 3 NEUTRON CROSS SECTIONS
BELOW 100 KEV, RESONANCE PARAMETERS WERE GIVEN.
ABOVE 100 KEV, THE SPHERICAL OPTICAL AND STATISTICAL MODEL
CALCULATION WAS PERFORMED WITH CASTHY/10/, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/11/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1 WERE
DETERMINED TO REPRODUCE A SYSTEMATIC TREND OF THE TOTAL CROSS
SECTION BY CHANGING RSO OF IIJIMA-KAWAI POTENTIAL/12/. THE
OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/13/
ALPHA = HUIZENGA AND IGO/14/
DEUTERON = LOHR AND HAEBERLI/15/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/16/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/17/ WERE EVALUATED BY IIJIMA ET AL./18/ MORE
EXTENSIVE DETERMINATION AND MODIFICATION WERE MADE IN THE
PRESENT WORK. TABLE 2 SHOWS THE LEVEL DENSITY PARAMETERS USED
IN THE PRESENT CALCULATION. ENERGY DEPENDENCE OF SPIN CUT-OFF
PARAMETER IN THE ENERGY RANGE BELOW E-JOINT IS DUE TO GRUPPELAAR
/19/.
MT = 1 TOTAL
SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED.
MT = 2 ELASTIC SCATTERING
CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).
MT = 4, 51 - 91 INELASTIC SCATTERING
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WAS
ADOPTED. THE LEVEL SCHEME WAS TAKEN FROM REF./20/
NO. ENERGY(MEV) SPIN-PARITY
GR. 0.0 9/2 +
1 0.1405 7/2 +
2 0.1426 1/2 -
3 0.1811 5/2 +
4 0.5091 3/2 -
5 0.5343 5/2 -
6 0.6254 7/2 +
7 0.6715 5/2 -
8 0.7263 11/2 +
9 0.7616 5/2 +
10 0.7620 13/2 +
LEVELS ABOVE 0.9 MEV WERE ASSUMED TO BE OVERLAPPING.
MT = 102 CAPTURE
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH
CASTHY WAS ADOPTED. DIRECT AND SEMI-DIRECT CAPTURE CROSS
SECTIONS WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI
AND REFFO/21/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (8.37E-03) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION OF 380 MILLI-BARNS AT 100
KEV MEASURED BY MACKLIN/22/.
MT = 16 (N,2N) CROSS SECTION
MT = 17 (N,3N) CROSS SECTION
MT = 22 (N,N'A) CROSS SECTION
MT = 28 (N,N'P) CROSS SECTION
MT = 32 (N,N'D) CROSS SECTION
MT = 33 (N,N'T) CROSS SECTION
MT =103 (N,P) CROSS SECTION
MT =104 (N,D) CROSS SECTION
MT =105 (N,T) CROSS SECTION
MT =106 (N,HE3) CROSS SECTION
MT =107 (N,ALPHA) CROSS SECTION
THESE REACTION CROSS SECTIONS WERE CALCULATED WITH THE
PREEQUILIBRIUM AND MULTI-STEP EVAPORATION MODEL CODE PEGASUS.
THE KALBACH'S CONSTANT K (= 101.5) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/23/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, THE (N,2N), (N,P) AND (N,ALPHA) CROSS SECTIONS WERE
NORMALIZED TO THE FOLLOWING VALUES AT 14.5 MEV:
(N,2N) 1230.00 MB (RECOMMENDED BY BYCHKOV ET AL./24/)
(N,P) 14.00 MB (RECOMMENDED BY FORREST/25/)
(N,ALPHA) 7.00 MB (RECOMMENDED BY FORREST)
MT = 251 MU-BAR
CALCULATED WITH CASTHY.
MF = 4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
LEGENDRE POLYNOMIAL COEFFICIENTS FOR ANGULAR DISTRIBUTIONS ARE
GIVEN IN THE CENTER-OF-MASS SYSTEM FOR MT=2 AND DISCRETE INELAS-
TIC LEVELS, AND IN THE LABORATORY SYSTEM FOR MT=91. THEY WERE
CALCULATED WITH CASTHY. FOR OTHER REACTIONS, ISOTROPIC DISTRI-
BUTIONS IN THE LABORATORY SYSTEM WERE ASSUMED.
MF = 5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS WERE CALCULATED WITH
PEGASUS FOR INELASTIC SCATTERING TO OVERLAPPING LEVELS AND FOR
OTHER NEUTRON EMITTING REACTIONS.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 47.5 R0 = 5.972 A0 = 0.62
WS = 9.74 RS = 6.594 AS = 0.35
VSO= 7.0 RSO= 5.97 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
41-NB- 95 1.277E+01 7.500E-01 2.121E+00 5.782E+00 1.120E+00
41-NB- 96 1.331E+01 5.880E-01 3.406E+00 2.530E+00 0.0
41-NB- 97 1.337E+01 6.710E-01 9.771E-01 5.026E+00 1.290E+00
41-NB- 98 1.380E+01 5.110E-01 2.350E+00 1.731E+00 0.0
42-MO- 96 1.403E+01 7.410E-01 6.991E-01 7.645E+00 2.400E+00
42-MO- 97 1.517E+01 6.800E-01 2.769E+00 6.036E+00 1.280E+00
42-MO- 98 1.594E+01 6.900E-01 7.358E-01 7.888E+00 2.570E+00
42-MO- 99 1.774E+01 6.200E-01 4.294E+00 6.058E+00 1.280E+00
43-TC- 97 1.600E+01 6.700E-01 4.756E+00 6.089E+00 1.120E+00
43-TC- 98 1.659E+01 6.120E-01 1.776E+01 4.176E+00 0.0
43-TC- 99 1.600E+01 6.550E-01 2.973E+00 5.984E+00 1.290E+00
43-TC-100 1.637E+01 5.850E-01 1.189E+01 3.635E+00 0.0
---------------------------------------------------------------
SPIN CUTOFF PARAMETERS WERE CALCULATED AS 0.146*SQRT(A)*A**(2/3).
IN THE CASTHY CALCULATION, SPIN CUTOFF FACTORS AT 0 MEV WERE
ASSUMED TO BE 7.899 FOR TC- 99 AND 5.0 FOR TC-100.
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