44-Ru-103
44-Ru-103 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091210
----JENDL-4.0 MATERIAL 4446
-----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.
**********************************************************
mf = 1 General information
mt=451 Comments and dictionary
mf = 2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
Resolved Resonance Parameters (MLBW; below 50 eV)
The resonance parameters of 8 levels up to 330 eV were
obtained by Anufriev et al./3/ Their parameters were
adopted. In addition, a negative resonance was assumed at
-3.0 eV and its parameters were determined so that the
capture cross section at 0.0253 eV was about 10 b.
No experimental data are available for any cross sections.
An upper bounday of the resolved resonance region was set at
50 eV, because level missing was obvious above this energy.
Unresolved resonance region : 50 eV - 100 keV
The neutron strength functions, S0, S1 and S2 were calculated
with optical model code CASTHY/4/. 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 = 6.000e-4, S2 = 0.530e-4, Sg = 76.7e-4,
Gg = 0.170 eV, R = 5.590 fm.
The unresolved resonance parameters were calculated using
the ASREP code/5/.
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 14.637
elastic 5.083
capture 9.554 62.0
-------------------------------------------------------
(*) In the energy range from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
In thermal region, the capture and elastic scattering cross
sections were assumed to be in 1/v form and constant,
respectively. Thermal capture cross section was determined by
the systematics from the neighboring Ru isotopes. The
scattering cross section was calculated from r = 6.3 fm.
Unresolved resonance parameters were given in the energy range
from 50 eV to 100 keV.
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/6/ 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/7/. The OMP's
for charged particles are as follows:
proton = Perey/8/
alpha = Huizenga and Igo/9/
deuteron = Lohr and Haeberli/10/
helium-3 and triton = Becchetti and Greenlees/11/
Parameters for the composite level density formula of Gilbert
and Cameron/12/ were evaluated by Iijima et al./13/ 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
/14/.
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./15/.
no. energy(MeV) spin-parity
gr. 0.0 3/2 +
1 0.0027 5/2 +
2 0.1360 5/2 +
3 0.1742 1/2 +
4 0.2134 7/2 +
5 0.2380 11/2 -
6 0.2877 1/2 +
7 0.2974 7/2 -
8 0.3465 5/2 +
9 0.4056 3/2 +
10 0.4319 1/2 +
11 0.4990 5/2 +
Levels above 0.511 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/16/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (7.69e-03) was determined from
the systematics of radiation width (0.170 eV) and average
s-wave resonance level spacing (22.1 eV).
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 =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 (= 111.5) was estimated by the
formula derived from Kikuchi-Kawai's formalism/17/ 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) 11.60 mb (systematics of Forrest/18/)
(n,alpha) 2.86 mb (systematics of 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 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- 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
42-MO-102 * 1.856E+01 6.452E-01 1.419E+00 8.145E+00 2.520E+00
43-TC-100 1.637E+01 5.850E-01 1.189E+01 3.635E+00 0.0
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
44-RU-101 1.726E+01 6.700E-01 7.228E+00 6.836E+00 1.280E+00
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
---------------------------------------------------------------
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 5.045 for Ru-103 and 4.524 for Ru-104.
References
1) Aoki, T. et al.: Proc. Int. Conf. on Nuclear Data for Basic
and Applied Science, Santa Fe., Vol. 2, p.1627 (1985).
2) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science
and Technology, Mito, p. 569 (1988).
3) V.A.Anufriev et al.: 1980 Kiev, Vol.2, p.156 (1980).
4) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975).
5) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999)
[in Japanese].
6) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).
7) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77
(1983).
8) Perey, F.G: Phys. Rev. 131, 745 (1963).
9) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).
10) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).
11) Becchetti, F.D., Jr. and Greenlees, G.W.: Polarization
Phenomena in Nuclear Reactions ((Eds) H.H. Barshall and
W. Haeberli), p. 682, the University of Wisconsin Press.
(1971).
12) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446
(1965).
13) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).
14) Gruppelaar, H.: ECN-13 (1977).
15) Matsumoto, J.: private communication (1981).
16) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
17) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
18) Forrest, R.A.: AERE-R 12419 (1986).