54-Xe-134 JAEA EVAL-FEB22 S.Kunieda, A.Ichihara, K.Shibata+
DIST-MAY10 20100316
----JENDL-4.0 MATERIAL 5455
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
History
09-11 Re-evaluation was performed for JENDL-4.0
10-03 Compiled by S.Kunieda
MF= 1 General information
MT=451 Descriptive data and directory
MF= 2 Resonance parameters
MT=151 Resolved and unresolved resonance parameters
- Resolved resonance region (MLBW formula): below 10.3 keV
Resonance parameters of JENDL-3.3 consisted of 1 point
data measured at 1000.6 eV by Ribon et al./1/ and
neutron capture area data measured at 2186, 6315, 7260,
and 9383 eV by Macklin /2/. The 1st level data given by
Ribon were (abundance)*g*(neutron width); this neutron width
was derived by using abundance (10.44 %) and g=1. The
neutron widths based on the area data were derived by
assuming average radiation width larger than area data and
g=1. This average radiation width was estimated to be 450
meV, and adopted also for the 1st level. The neutron orbital
angular momentum l was assumed to be 0 for all resonance
levels. A negative resonance level was added at -100 ev so
as to reproduce the thermal capture cross section of 265+-20
mb measured by Kondaiah et al./3/. The scattering radius
was taken from the graph (fig. 1, Part A) given by
Mughabghab et al./4/.
In JENDL-4, errors of input data were only modified.
- Unresolved resonance region: 10.3 keV - 250 keV
The parameters were obtained by fitting to the total and
capture cross sections calculated by the POD code /5/.
The ASREP code /6/ was employed in this evaluation.
The unresolved parameters should be used only for
self-shielding calculation.
Thermal cross sections & resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 3.99976E+00
Elastic 3.73469E+00
n,gamma 2.65070E-01 5.95524E-01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
MF= 3 Neutron cross sections
MT= 1 Total cross section
Sum of partial cross sections.
MT= 2 Elastic scattering cross section
The OPTMAN /7/ & POD /5/ calculations.
MT= 3 Non-elastic cross section
Sum of partial non-elastic cross sections.
MT= 4,51-91 (n,n') cross section
The OPTMAN /7/ & POD /5/ calculations.
MT= 16 (n,2n) cross section
MT= 17 (n,3n) cross section
MT= 22 (n,na) cross section
MT= 28 (n,np) cross section
MT= 32 (n,nd) cross section
Calculated by the POD code /5/.
MT=102 Capture cross section
Calculated by the POD code /5/. The value of gamma-ray
strength function was determined to reproduce experimental
capture cross sections measured by Beer et al /8/.
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,a) cross section
Calculated by the POD code /5/.
MT=203 (n,xp) cross section
Sum of (n,np) and (n,p)
MT=204 (n,xd) cross section
Sum of (n,nd) and (n,d)
MT=205 (n,xt) cross section
MT=206 (n,xHe3) cross section
Calculated by the POD code /5/.
MT=207 (n,xa) cross section
Sum of (n,na) and (n,a)
MF= 4 Angular distributions of emitted neutrons
MT= 2 Elastic scattering
The OPTMAN /7/ & POD /5/ calculations.
MF= 6 Energy-angle distributions of emitted particles
MT= 16 (n,2n) reaction
MT= 17 (n,3n) reaction
MT= 22 (n,na) reaction
MT= 28 (n,np) reaction
MT= 32 (n,nd) reaction
Neutron spectra calculated by the POD code /5/.
MT= 51-90 (n,n') reaction
Neutron angular distributions calculated by
OPTMAN /7/ & POD /5/.
MT= 91 (n,n') reaction
Neutron spectra calculated by the POD code /5/.
MT= 203 (n,xp) reaction
MT= 204 (n,xd) reaction
MT= 205 (n,xt) reaction
MT= 206 (n,xHe3) reaction
MT= 207 (n,xa) reaction
Light-ion spectra calculated by the POD code /6/.
MF=12 Gamma-ray multiplicities
MT= 3 Non-elastic gamma emission
Calculated by the POD code /5/.
MF=14 Gamma-ray angular distributions
MT= 3 Non-elastic gamma emission
Assumed to be isotropic.
MF=15 Gamma-ray spectra
MT= 3 Non-elastic gamma emission
Calculated by the POD code /5/.
***************************************************************
* Nuclear Model Calculations with POD Code /5/ *
***************************************************************
1. Theoretical models
The POD code is based on the spherical optical model, the
distorted-wave Born approximaiton (DWBA), one-component exciton
preequilibrium model, and the Hauser-Feshbach-Moldauer statis-
tical model. With the preequilibrium model, semi-empirical
pickup and knockout process can be taken into account for
composite-particle emission. The gamma-ray emission from the
compound nucleus can be calculated within the framework of the
exciton model. The code is capable of reading in particle
transmission coefficients calculated by separate spherical or
coupled-channel optical model code. In this evaluation, the OPTMAN
code /7/ was employed for neutrons, while the ECIS code
/9/ was adopted for charged particles.
2. Optical model & parameters
Neutrons:
Model: The coupled-channel method based on the rigid-rotor
model was adopted. Deformation parameter beta2 was
taken from ref./10/
OMP : Coupled-channel optical potential /11/ was applied.
Protons:
Model: Spherical
OMP : Koning and Delaroche /12/
Deuterons:
Model: Spherical
OMP : Bojowald et al. /13/
Tritons:
Mode: Spherical
OMP : Becchetti and Greenlees /14/
He-3:
Model: Spherical
OMP : Becchetti and Greenlees /14/
Alphas:
Model: Spherical
OMP : A simplified folding model potential /2/
(The nucleon OMP was taken from Ref./11/.)
3. Level scheme of Xe-134
------------------------------------
No. Ex(MeV) J PI CC
------------------------------------
0 0.00000 0 + *
1 0.84704 2 + *
2 1.61377 2 +
3 1.73116 4 + *
4 1.91960 3 +
5 1.96550 7 -
6 2.13661 5 +
7 2.27201 4 +
8 2.30225 4 +
9 2.35297 4 +
10 2.40850 5 +
------------------------------------
Levels above 2.41850 MeV are assumed to be continuous.
4. Level density parameters
Energy-dependent parameters of Mengoni-Nakajima /15/ were used
----------------------------------------------------------
Nuclei a* Pair Esh T E0 Ematch Elv_max
1/MeV MeV MeV MeV MeV MeV MeV
----------------------------------------------------------
Xe-135 17.198 1.033 -3.799 0.704 0.072 5.487 1.968
Xe-134 16.449 2.073 -2.814 0.742 0.503 7.492 2.409
Xe-133 16.992 1.041 -1.762 0.696 -0.731 6.456 0.911
Xe-132 16.240 2.089 -1.146 0.723 0.006 8.026 2.425
I -134 16.358 0.000 -4.805 0.906 -2.236 7.123 0.210
I -133 15.660 1.041 -3.586 0.875 -1.279 8.089 2.025
I -132 16.152 0.000 -2.493 0.768 -1.905 5.957 0.162
Te-132 16.240 2.089 -4.641 0.884 0.085 8.791 1.925
Te-131 22.166 1.048 -3.417 0.613 -0.582 5.846 1.043
Te-130 16.030 2.105 -2.605 0.776 0.213 8.078 1.815
----------------------------------------------------------
5. Gamma-ray strength functions
M1, E2: Standard Lorentzian (SLO)
E1 : Generalized Lorentzian (GLO) /16/
6. Preequilibrium process
Preequilibrium is on for n, p, d, t, He-3, and alpha.
Preequilibrium capture is on.
References
1) Ribon, P. et al.: CEA-N-1149 (1969).
2) Macklin, R.L.: ORNL-TM-10766 (1988).
3) Kondaiah, E. et al.: Nucl. Phys., A120, 329 (1968).
4) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I,
Part A", Academic Press (1981).
5) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007).
6) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999)
[in Japanese].
7) E.Soukhovitski et al., JAERI-Data/Code 2005-002 (2005).
8) H.Beer et al., NEANDC(E)-252U,5,8406 (1984).
9) J.Raynal, CEA Saclay report, CEA-N-2772 (1994).
10) S.Raman et al., At. Data and Nucl. Data Tables 78, 1 (1995)
11) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007).
12) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003).
13) Bojowald et al., Phys. Rev. C 38, 1153 (1988).
14) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization
Phenomena in Nuclear Reactions," p.682, The University
of Wisconsin Press (1971).
15) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151
(1994).
16) M.Brink, Ph.D thesis, Oxford University, 1955.