42-Mo-100
42-MO-100 JNDC EVAL-AUG89 JNDC FP NUCLEAR DATA W.G.
DIST-MAY90 REV2-NOV93
----JENDL-3.2 MATERIAL 4249
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
84-10 EVALUATION FOR JENDL-2 WAS MADE BY JNDC FPND W.G./1/
89-08 MODIFICATION FOR JENDL-3 WAS MADE/2/.
90-10 MF=5: SPECTRA AT THRESHOLD ENERGIES WERE MODIFIED.
93-11 JENDL-3.2.
COMPILED BY T.NAKAGAWA (NDC/JAERI)
***** MODIFIED PARTS FOR JENDL-3.2 ********************
(2,151) UNRESOLVED RESONANCE PARAMETERS
(3,1) CALCULATED FROM NEW OPTICAL POTENTIAL
(3,4), (3,51-91), (3,16), (3,17), (3,22), (3,28)
TAKEN FROM JENDL FUSION FILE
(3,32) DELETED
(4,16-91) TAKEN FROM JENDL FUSION FILE
(5,16-91) TAKEN FROM JENDL FUSION FILE
***********************************************************
-------------------------------------------------------------
JENDL FUSION FILE /3/ (AS OF OCT. 1993)
EVALUATED BY K.KOSAKO(NEDAC) AND S.CHIBA (NDC/JAERI)
COMPILED BY K.KOSAKO
THE INELASTIC SCATTERING, (N,2N), (N,3N), (N,NP), (N,NA)
CROSS SECTIONS WERE CALCULATED WITH SINCROS-II SYSTEM /4/.
THE OTHER CROSS SECTIONS WERE TAKEN FROM JENDL-3.1. MF=6
OF MT=16, 17, 22, 28 AND 91 WERE CREATED WITH F15TOB
PROGRAM /3/ IN WHICH KUMABE'S SYSTEMATICS /5/ WAS USED.
THE PRECOMPOUND/COMPOUND RATIO WAS CALCULATED BY THE
SINCROS-II CODE SYSTEM/4/.
OPTICAL-MODEL, LEVEL DENSITY AND OTHER PARAMETERS USED
IN THE SINCROS-II CALCULATION ARE DESCRIBED IN REF./4/.
LEVEL SCHEMES WERE DETERMINED ON THE BASIS OF ENSDF/6/.
-------------------------------------------------------------
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 26 KEV
PARAMETERS WERE TAKEN FROM JENDL-2 WHICH WAS EVALUATED BY
KIKUCHI ET AL./7/ ON THE BASIS OF THE FOLLOWING EXPERIMENTAL
DATA:
TRANSMISSION : WEIGMANN ET AL./8/
CAPTURE : WEIGMANN ET AL./9/, MUSGROVE ET AL./10/
AVERAGE RADIATION WIDTHS OF 0.065 EV AND 0.08 EV WERE ADOPTED
TO S-WAVE AND P-WAVE RESONANCES, RESPECTIVELY. A NEGATIVE
RESONANCE WAS ADDED AT -172 EV SO AS TO REPRODUCE THE THERMAL
CAPTURE CROSS SECTION GIVEN BY MUGHABGHAB ET AL./11/
SCATTERING RADIUS WAS TAKEN FROM REF./11/.
UNRESOLVED RESONANCE REGION : 26 KEV - 100 KEV
THE NEUTRON STRENGTH FUNCTIONS, S0, S1 AND S2 WERE CALCULATED
WITH OPTICAL MODEL CODE CASTHY/12/. THE OBSERVED LEVEL
SPACING WAS DETERMINED TO REPRODUCE THE CAPTURE CROSS SECTION
CALCULATED WITH CASTHY. THE EFFECTIVE SCATTERING RADIUS WAS
OBTAINED FROM FITTING TO THE CALCULATED TOTAL CROSS SECTION AT
100 KEV.
TYPICAL VALUES OF THE PARAMETERS AT 50 KEV:
S0 = 0.370E-4, S1 = 5.479E-4, S2 = 0.365E-4, SG = 1.58E-4,
GG = 0.085 EV, R = 6.308 FM.
CALCULATED 2200-M/S CROSS SECTIONS AND RES. INTEGRALS (BARNS)
2200 M/S RES. INTEG.
TOTAL 5.499 -
ELASTIC 5.300 -
CAPTURE 0.1990 3.91
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, BY TAKING ACCOUNT OF
COMPETING REACTIONS, OF WHICH CROSS SECTIONS WERE CALCULATED
WITH PEGASUS/13/ STANDING ON A PREEQUILIBRIUM AND MULTI-STEP
EVAPORATION MODEL. THE OMP'S FOR NEUTRON GIVEN IN TABLE 1(A)
WERE DETERMINED BY IIJIMA AND KAWAI/14/ TO REPRODUCE A SYSTEMA-
TIC TREND OF THE TOTAL CROSS SECTION. THIS SET WAS USED FOR
CALCULATION OF THE CAPTURE CROSS SECTION WITH CASTHY AND THE
PEGASUS CALCULATION, AND ANGULAR DISTRIBUTIONS OF ELASTICALLY
SCATTERED NEUTRONS. ANOTHER SET OF PARAMETERS IN TABLE 1(B) WAS
DETEMINED BY WATANABE/15/ TO FIT BETTER THE MEASUED TOTAL CROSS
SECTION, AND WAS USED FOR THE TOTAL CROSS SECTION CALCULATION
FOR JENDL-3.2. THE OMP'S FOR CHARGED PARTICLES ARE AS FOLLOWS:
PROTON = PEREY/16/
ALPHA = HUIZENGA AND IGO/17/
DEUTERON = LOHR AND HAEBERLI/18/
HELIUM-3 AND TRITON = BECCHETTI AND GREENLEES/19/
PARAMETERS FOR THE COMPOSITE LEVEL DENSITY FORMULA OF GILBERT
AND CAMERON/20/ WERE EVALUATED BY IIJIMA ET AL./21/ 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
/22/.
FOR JENDL-3.2, THE INELASTIC SCATTERING, (N,2N), (N,3N),
(N,NP), (N,NA) CROSS SECTIONS WERE ADOPTED FROM JENDL FUSION
FILE. THE CALCULATION WAS MADE WITH SINCROS-II SYSTEM/4/ BY
ADOPTIG WALTER-GUSS OMP MODIFIED BY YAMAMURO/4/ FOR NEUTRONS,
LEMOS OMP MODIFIED BY ARTHUR AND YOUNG/23/ FOR ALPHA, THE SAME
OMP'S AS THE PEGASUS CALCULATION FOR OTHER CHARGED PARTICLES AND
STANDARD LEVEL DENSITY PARAME- TERS OF SINCROS-II SYSTEM.
MT = 1 TOTAL
SPHERICAL OPTICAL MODEL CALCULATION WAS ADOPTED. OPTICAL
POTENTIAL PARAMETERS ARE GIVEN IN TABLE 1(B).
MT = 2 ELASTIC SCATTERING
CALCULATED AS (TOTAL - SUM OF PARTIAL CROSS SECTIONS).
MT = 4, 51 - 91 INELASTIC SCATTERING
TAKEN FROM JENDL FUSION FILE. THE LEVEL SCHEME WAS TAKEN FROM
REF./6/ CNTRIBUTIONS OF THE DIRECT PROCESS WAS CALCULATED
FOR THE LEVELS MARKED WITH '*'.
NO. ENERGY(MEV) SPIN-PARITY (DIRECT PROCESS)
GR. 0.0 0 +
1 0.5356 2 + *
2 0.6944 0 +
3 1.0637 2 +
4 1.1361 4 +
LEVELS ABOVE 1.136 MEV WERE ASSUMED TO BE OVERLAPPING.
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
THESE CROSS SECTIONS WERE ADOPTED FROM JENDL FUSION FILE.
THE (N,2N) CROSS SECTION CALCULATED WITH SINCROS-II WAS
MULTIPLIED BY 1.08.
MT = 102 CAPTURE
SPHERICAL OPTICAL AND STATISTICAL MODEL CALCULATION WITH
CASTHY WAS ADOPTED. OPTICAL POTENTIAL PARAMETERS ARE LISTED
IN TABLE 1(A). DIRECT AND SEMI-DIRECT CAPTURE CROSS SECTIONS
WERE ESTIMATED ACCORDING TO THE PROCEDURE OF BENZI AND
REFFO/24/ AND NORMALIZED TO 1 MILLI-BARN AT 14 MEV.
THE GAMMA-RAY STRENGTH FUNCTION (1.43E-04) WAS ADJUSTED TO
REPRODUCE THE CAPTURE CROSS SECTION MEASURED BY MUSGROVE ET
AL./10/
MT =103 (N,P) CROSS SECTION
MT =104 (N,D) CROSS SECTION
MT =105 (N,T) 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 (=50.6 ) WAS ESTIMATED BY THE
FORMULA DERIVED FROM KIKUCHI-KAWAI'S FORMALISM/25/ AND LEVEL
DENSITY PARAMETERS.
FINALLY, (N,P) AND (N,ALPHA) CROSS SECTIONS WERE NORMALIZED TO
THE FOLLOWING VALUES AT 14.5 MEV:
(N,P) 2.50 MB (RECOMMENDED BY FORREST/26/)
(N,ALPHA) 2.80 MB (MEASURED BY IKEDA ET AL./27/)
MT = 251 MU-BAR
CALCULATED WITH CASTHY.
MF = 4 ANGULAR DISTRIBUTIONS OF SECONDARY NEUTRONS
MT = 2
CALCULATED WITH CASTHY/12/ AND OMP IN TABLE 1(A).
MT = 51-54
TAKEN FROM JENDL FUSION FILE DATA WHICH WAS CALCULATED WITH
CASTHY AND DWUCK/28/ IN THE SINCROS-II SYSTEM.
MT = 16,17,22,28,91
TRANSFORMED FROM MF=6 DATA (DDX) OF JENDL FUSION FILE.
MF = 5 ENERGY DISTRIBUTIONS OF SECONDARY NEUTRONS
MT = 16,17,22,28,91
TRANSFORMED FROM MF=6 DATA (DDX) OF JENDL FUSION FILE.
=================================================================
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TABLE 1(A) NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 46.0-0.25E R0 = 5.893 A0 = 0.62
WS = 7.0 RS = 6.393 AS = 0.35
VSO= 7.0 RSO= 5.893 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 1(B) NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 49.29-0.5266E R0 = 1.270 A0 = 0.664
WS = 6.574+0.5038E RS = 1.264 AS = 0.538
VSO= 9.0 RSO= 1.201 ASO= 0.367
* COEFFICIENTS OF A**(1/3)
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
40-ZR- 96 1.320E+01 7.000E-01 2.235E-01 6.589E+00 2.490E+00
40-ZR- 97 1.259E+01 5.590E-01 2.497E-01 3.084E+00 1.200E+00
40-ZR- 98 * 1.725E+01 6.633E-01 1.790E+00 7.555E+00 2.140E+00
40-ZR- 99 * 1.831E+01 6.566E-01 1.170E+01 6.957E+00 1.200E+00
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
41-NB- 99 * 1.742E+01 6.566E-01 1.085E+01 6.300E+00 9.400E-01
41-NB-100 * 1.850E+01 6.500E-01 7.329E+01 5.699E+00 0.0
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
42-MO-100 1.780E+01 6.000E-01 6.702E-01 6.645E+00 2.220E+00
42-MO-101 2.085E+01 5.650E-01 7.153E+00 6.092E+00 1.280E+00
---------------------------------------------------------------
SYST: * = LDP'S WERE DETERMINED FROM SYSTEMATICS.
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 5.125 FOR MO-100 AND 5.000 FOR MO-101.
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