44-Ru-101
44-Ru-101 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20100202
----JENDL-4.0 MATERIAL 4440
-----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/.
93-10 JENDL-3.2 was made by JNDC FPND W.G.
10-02 Compiled by A.Ichihara.
***** modified parts for JENDL-3.2 ********************
(2,151) Small change in unresolved res. paramters
(3,2), (3,4), (3,51-91), (3,102)
(4,51-91)
Level scheme for inelastic scattering cross
sections were replaced.
***********************************************************
***** 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 region (MLBW; below 1.06 keV)
The data of JENDL-3.3 was adopted, and parameters of a
negative resonance were modified so as to repruduce the
measured thermal capture cross section of 5.2 +- 0.3 b/3/,
and elastic scattering of 6.0 +- 0.5 b/4/.
** comments to JENDL-3.3 **
Resonance parameters of JENDL-2 were modified according to new
experimental data.
For JENDL-2, parameters were determined from the experimen-
tal data of Priesmeyer and Jung/5/ and Popov et al./6/
Values of spin J were based on the data of Coceva et al./7/
A negative resonance was added at -20 eV to reproduce the
capture cross section of 3.4+-0.9 barns at 0.0253 eV/8/.
Average radiation width of 0.180+-0.022 eV was deduced, and
adopted to the levels whose radiation width was unknown.
For JENDL-3, parameters of 40 levels were reevaluated on
the basis of the new experimental data of Anufriev/9/ for
neutron widths. Radiation widths and total spin J of
several levels were also revised according to Anufriev's
data. Scattering radius was modified to 6.1 fm. Total spin
J of some resonances was tentatively estimated with a random
number method. Neutron orbital angular momentum L of some
resonances was determined with a method of Bollinger and
Thomas/10/.
Unresolved resonance region : 1.06 keV - 100 keV
The parameters were adjusted to reproduce the capture cross
section measured by Macklin et al./11,12/ The effective
scattering radius was obtained from fitting to the calculated
total cross section at 100 keV.
The unresolved parameters should be used only for
self-shielding calculation.
Typical values of the parameters at 70 keV:
S0 = 0.59e-4, S1 = 6.10e-4, S2 = 0.54e-4, Sg = 105.e-4,
Gg = 0.173 eV, R = 5.062 fm.
Thermal cross sections and resonance integrals at 300K (b)
-------------------------------------------------------
0.0253 eV reson. integ.(*)
-------------------------------------------------------
total 11.234
elastic 6.002
capture 5.232 101
-------------------------------------------------------
(*) In the energy range from 0.5 eV to 10 MeV.
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/13/, by taking account of
competing reactions, of which cross sections were calculated
with PEGASUS/14/ 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/15/. 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/.
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./23/.
no. energy(MeV) spin-parity
gs 0.0 5/2 +
1 0.12723 3/2 +
2 0.30685 7/2 +
3 0.31133 5/2 +
4 0.32480 1/2 +
5 0.42230 3/2 +
6 0.52750 11/2 -
7 0.53500 5/2 +
8 0.54508 7/2 +
9 0.59830 5/2 -
10 0.61630 3/2 +
11 0.62300 3/2 +
12 0.62350 1/2 +
13 0.68400 3/2 +
14 0.71800 1/2 -
15 0.72000 9/2 +
16 0.82300 3/2 +
17 0.84278 7/2 +
18 0.90800 1/2 -
19 0.92700 3/2 +
20 0.92872 9/2 +
21 0.93847 7/2 +
22 0.97340 5/2 +
23 1.0012 11/2 +
24 1.0410 3/2 +
25 1.0510 7/2 +
26 1.0980 1/2 +
27 1.1100 1/2 +
28 1.1690 3/2 +
Levels above 1.2068 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/24/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (1.16e-02) was adjusted to
reproduce the capture cross section of 500 milli-barns at 100
keV measured by Macklin et al./11,12/
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 =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 (= 106.5) was estimated by the
formula derived from Kikuchi-Kawai's formalism/25/ 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) 24.00 mb (systematics of Forrest/26/)
(n,alpha) 6.07 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 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
---------------------------------------------------------------
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
42-MO-100 1.780E+01 6.000E-01 6.702E-01 6.645E+00 2.220E+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
43-TC-101 1.675E+01 6.440E-01 6.361E+00 5.761E+00 9.400E-01
44-RU- 99 1.650E+01 6.570E-01 4.016E+00 6.235E+00 1.280E+00
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
---------------------------------------------------------------
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 14.30 for Ru-101 and 7.654 for Ru-102.
References
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