44-Ru-102
44-Ru-102 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091209
----JENDL-4.0 MATERIAL 4443
-----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 formula) : below 13.4 keV
JENDL-3.3 was adopted, and parameters of a negative resonance
were modified so as to repruduce the thermal total cross
setion of 10.4+-0.6 b/3/, capture cross section of 1.48+-
0.16 b/4,5,6/. The data of Ishikawa/5/ was
multiplied by a factor of 1.26, because standard cross section
of Ru-96(n,g) has changed from 0.21 b to 0.27 b. Scattering
radius of 6.6 fm was assumed from its systematics/7/.
** comments to JENDL-3.3 **
Resonance parameters of JENDL-2/1/ were modified according
to new experimental data.
For JENDL-2, resonance energies below 2.5 keV were taken
from the data of Priesmeyer and Jung/8/ and Shaw et al./9/,
and for the other resonances above 2.7 keV from Macklin and
Halperin/10/. The neutron and radiation widths of large
resonances were taken from Priesmeyer and Jung/8/ and Macklin
and Halperin/10/. For others, the average radiation width of
0.112+-0.027 eV was adopted. For levels observed by Shaw et
al. and for three fictitious levels at 2.467, 2.556 and 2.645
keV, the parameters were determined by assuming S0=0.43e-4,
D0=340 ev, S1=4.1e-4 and D1=110 eV. Parameters of the
negative level added at -146 eV and the first positive level
were adjusted to reproduce the capture cross section of 1.21
+-0.07 barns at 0.0253 eV and its resonance integral of 4.2
+-0.1 barns/11/.
For JENDL-3, neutron and radiation widths of 14 resonances
were reevaluated on the basis of the experimental data of
Anufriev et al./12/ For the resonances observed by Shaw et
al., reduced neutron widths were given as 6.5 meV and 65 meV
for s-wave and p-wave resonances, respectively. Parameters of
the negative resonance were also revise. Scattering radius
was modified from 6.35 fm to 6.1 fm based on the systematics.
Neutron orbital angular momentum L of some resonances was
estimated with a method of Bollinger and Thomas/13/.
Unresolved resonance region : 13.4 keV - 300 keV
Unresolved resonance parameters were adopted from JENDL-2.
The neutron strength functions, S0, S1 and S2 were calculated
with optical model code CASTHY/14/. 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 = 5.000e-4, S2 = 0.530e-4, Sg = 3.61e-4,
Gg = 0.115 eV, R = 5.756 fm.
The unresolved resonance parameters were calculated using
the ASREP code/15/.
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 10.408
elastic 8.932
capture 1.475 4.41
-------------------------------------------------------
(*) In the energy range from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 13.4 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/16/ 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/17/. The
OMP's for charged particles are as follows:
proton = Perey/18/
alpha = Huizenga and Igo/19/
deuteron = Lohr and Haeberli/20/
helium-3 and triton = Becchetti and Greenlees/21/
Parameters for the composite level density formula of Gilbert
and Cameron/22/ were evaluated by Iijima et al./23/ 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
/24/.
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./25/.
no. energy(MeV) spin-parity dwba cal.
gr. 0.0 0 +
1 0.4751 2 + *
2 0.9437 0 +
3 1.1032 2 +
4 1.1064 4 +
5 1.5217 3 +
6 1.5806 2 +
7 1.6027 4 +
8 1.7987 4 +
9 1.8371 0 +
10 1.8732 6 +
11 2.0369 2 +
12 2.0442 3 - *
13 2.2192 5 +
14 2.2612 2 +
15 2.3720 5 -
16 2.4211 4 +
17 2.4419 4 +
Levels above 2.5 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/26/. Deformation parameters (beta2 = 0.2443 and
beta3 = 0.196) were based on the data compiled by Raman et
al./27/ and Spear/28/, respectively.
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/29/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (3.44e-04) was adjusted to
reproduce the capture cross section of 110 milli-barns at 70
keV measured by Macklin et al./30,31/
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 (= 72.0) was estimated by the
formula derived from Kikuchi-Kawai's formalism/32/ 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) 16.70 mb (systematics of Forrest/33/)
(n,alpha) 6.20 mb (recommended by Forrest/33/)
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 A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
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
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
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
44-RU-100 1.520E+01 7.200E-01 7.835E-01 8.078E+00 2.570E+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
---------------------------------------------------------------
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 7.654 for Ru-102 and 5.045 for Ru-103.
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.: Sov. At. Energy, 58, 326 (1985).
4) P.M.Lantz: ORNL 3832, p.6 (1965).
5) H.Ishikawa: J. Nucl. Sci. Technol., 6, 587 (1969).
6) R.E.Heft: 1978 MAYAG, p.495 (1978).
7) S.F.Mughabghab: "Atlas of Neutron Resonances," Elsevier
(2006).
8) H.G.Priesmeyer, H.H.Jung: Atomkernenergie, 19, 111 (1972).
9) R.A.Shaw et al.: Bull. Amer. Phys. Soc., 20, 560 (1975).
10) R.L.Macklin, J.Halperin: Nucl. Sci. Eng., 73, 174 (1980).
11) S.F.Mughabghab et al.: "Neutron Cross Sections, Vol. I,
Part A", Academic Press (1981).
12) V.A.Anufriev et al.: Atom. Energiya, 58, 279 (1985).
13) L.M.Bollinger, G.E.Thomas: Phys. Rev., 171, 1293 (1968).
14) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975).
15) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999)
[in Japanese].
16) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).
17) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77
(1983).
18) Perey, F.G: Phys. Rev. 131, 745 (1963).
19) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).
20) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).
21) 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).
22) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446
(1965).
23) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).
24) Gruppelaar, H.: ECN-13 (1977).
25) Matsumoto, J., et al.: JAERI-M 7734 (1978).
26) Kunz, P.D.: private communication.
27) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1
(1987)
28) Spear, R.H.: Atom. Data and Nucl. Data Table, 42, 55 (1989).
29) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
30) Macklin, R.L., et al.: Proc. Specialists' Meeting on Neutron
Cross Sections of Fission Products, Bologna 1979, NEANDC(E)
209L, 103.
31) Macklin, R.L. and Winters, R.R.: Nucl. Sci. Eng., 78, 110
(1981).
32) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
33) Forrest, R.A.: AERE-R 12419 (1986).