44-Ru-104
44-Ru-104 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091210
----JENDL-4.0 MATERIAL 4449
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
===========================================================
JENDL-3.2 data were automatically transformed to JENDL-3.3.
Interpolation of spectra: 22 (unit base interpolation)
(3,251) deleted, T-matrix of (4,2) deleted, and others.
===========================================================
History
84-10 Evaluation for JENDL-2 was made by JNDC FPND W.G./1/
90-03 Modification for JENDL-3 was made/2/.
09-12 JENDL-4.0.
Compiled by A.Ichihara (jaea/ndc).
***** modified parts for JENDL-4.0 *******************
(2,151) Resolved resonance parameters were revised
by T.Nakagawa.
(2,151) Unresolved resonance parameters were updated.
**********************************************************
mf = 1 General information
mt=451 Comments and dictionary
mf = 2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
Resolved Resonance Region (MLBW; below 11.12 keV)
Resonance parameters of JENDL-3.3 were adopted by revising
those of the negative resonance so that the thermal capture
cross section was in good areement with experimental data of
0.47 b/3,4/. Scattering radius was changed from 6.35
fm to 6.5 fm considering its systematics/5/.
** comments to JENDL-3.3 **
Resonance parameters were taken from JEDL-2 except those of
the 1st positive and a negative resonances.
Parameters for JENDL-2 were evaluated as follows:
Resonance energies below 2 keV were taken from the experimen-
tal data by Priesmeyer and Jung/6/ and Shaw et al./7/, other
resonances above 2.7 keV were determined from Macklin and
Halperin/8/. The neutron widths were evaluated on the basis
of the data of Priesmeyer and Jung, and of Macklin and
Halperin. The radiation widths of large resonances were taken
from Ref./8/ For the others, the average radiation width of
0.103+-0.018 eV was deduced, and adopted to the levels whose
radiation width was unknown. Seven hypothetical resonances
were generated in the energy range from 2 to 2.7 keV. For the
levels observed by Shaw et al. and the hypothetical ones,
reduced neutron widths of 12 and 38 meV were given for s-wave
and p-wave resonances, respectively. A negative resonance was
added at -941 eV so as to reproduce the capture cross section
of 0.32+-0.02 barns at 0.0253 eV/9/.
For JENDL-3, parameters of the first positive and negative
resonances were modified so as to reproduce the resonance
integral recommended by Mughabghab et al./9/ Scattering
radius was reduced from 6.35 fm to 6.1 fm on the basis of the
systematics.
Unresolved resonance region : 11.12 keV - 300 keV
The neutron strength functions, S0 and S2 were calculated with
optical model code CASTHY/10/, and S1 was based on the the
compilation of Mughabghab et al./9/ 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 70 keV:
S0 = 0.450e-4, S1 = 5.700e-4, S2 = 0.530e-4, Sg = 2.95e-4,
Gg = 0.110 eV, R = 5.366 fm.
The unresolved resonance parameters were calculated using
the ASREP code/11/.
The parameters should be used only for self-shielding
calculation.
Thermal cross sections and resonance integrals at 300K (b)
-------------------------------------------------------
0.0253 eV reson. integ.(*)
-------------------------------------------------------
total 6.931
elastic 6.462
capture 0.4691 6.62
-------------------------------------------------------
(*) In the energy range from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 11.12 keV, resolved resonance parameters were given.
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/12/ 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/13/. The
OMP's for charged particles are as follows:
proton = Perey/14/
alpha = Huizenga and Igo/15/
deuteron = Lohr and Haeberli/16/
helium-3 and triton = Becchetti and Greenlees/17/
Parameters for the composite level density formula of Gilbert
and Cameron/18/ were evaluated by Iijima et al./19/ 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
/20/.
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./21/.
no. energy(MeV) spin-parity dwba cal.
gr. 0.0 0 +
1 0.3580 2 + *
2 0.8885 4 +
3 0.8930 2 +
4 0.9881 0 +
5 1.2423 3 +
Levels above 1.5 MeV were assumed to be overlapping.
For the levels with an asterisk, the contribution of direct
inelastic scattering cross sections was calculated by the
DWUCK-4 code/22/. Deformation parameter (beta2 = 0.2742) was
based on the data compiled by Raman et al./23/
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/24/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (2.85e-04) was adjusted to
reproduce the capture cross section of 95 milli-barns at 70
keV measured by Macklin et al./25,26/
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 =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 (= 62.0) was estimated by the
formula derived from Kikuchi-Kawai's formalism/27/ and level
density parameters.
Finally, the (n,p) and (n,alpha) cross sections were
normalized to the following values at 14.5 MeV:
(n,p) 7.00 mb (recommended by Forrest/28/)
(n,alpha) 2.60 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. Contribution of direct inelastic
scattering was calculated with DWUCK-4. For other reactions,
isotropic distributions 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 from 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 SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
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
42-MO-102 * 1.856E+01 6.452E-01 1.419E+00 8.145E+00 2.520E+00
42-MO-103 2.175E+01 5.300E-01 5.321E+00 5.655E+00 1.280E+00
43-TC-101 1.675E+01 6.440E-01 6.361E+00 5.761E+00 9.400E-01
43-TC-102 1.761E+01 5.400E-01 1.217E+01 3.317E+00 0.0
43-TC-103 1.810E+01 6.310E-01 6.436E+00 6.379E+00 1.240E+00
43-TC-104 1.600E+01 5.500E-01 7.030E+00 2.960E+00 0.0
44-RU-102 1.643E+01 6.550E-01 8.872E-01 7.106E+00 2.220E+00
44-RU-103 1.890E+01 6.480E-01 1.210E+01 7.110E+00 1.280E+00
44-RU-104 1.650E+01 6.780E-01 8.593E-01 7.878E+00 2.520E+00
44-RU-105 2.025E+01 6.060E-01 1.144E+01 6.747E+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 4.524 for Ru-104 and 5.0 for Ru-105.
References
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(2006).
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(1965).
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20) Gruppelaar, H.: ECN-13 (1977).
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(1987)
24) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
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Cross Sections of Fission Products, Bologna 1979, NEANDC(E)
209L, 103.
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(1981).
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Reactions", North Holland (1968).
28) Forrest, R.A.: AERE-R 12419 (1986).