42-Mo- 94 JAEA EVAL-MAR09 K.Shibata, A.Ichihara, S.Kunieda+
DIST-MAY10 20091210
----JENDL-4.0 MATERIAL 4231
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
History
09-03 The data above the resolved resonance region were evaluated
by K.Shibata, A.Ichihara, and S.Kunieda /1/.
The resolved resonance parameters were evaluated by
T.Nakagawa.
09-12 Compiled by K.Shibata
MF= 1 General information
MT=451 Descriptive data and directory
MF= 2 Resonance parameters
MT=151 Resolved and unresolved resoannce parameters
Resolved resonance region: below 20 keV
Based on the experimental data of Weigmann et al./2/,
Musgrove /3/, and Wang et al./4/. A negative resonance
was placed so as to reproduce the capture cross section
recommended by Mughabghab./5/
Unresolved resonance region: 20 keV - 1 MeV
The parameters were obtained by fitting to the evaluated
total and capture cross sections mentioned below. The
unresolved parameters should be used only for self-shielding
calculation.
Thermal cross sections and resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 6.1975E+00
Elastic 5.8583E+00
n,gamma 3.3923E-01 1.4745E+00
----------------------------------------------------------
(*) 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 POD calculations were not accepted, since a considerable
underestimate was shown in the benchmark results with
molybdenum reflectors for fast neutrons. As a result, the
data were taken from JENDL-3.3.
MT= 3 Non-elastic cross section
Sum of partial non-elastic cross sections.
MT= 4,51-91 (n,n') cross section
Calculated with POD code /6/.
MT= 16 (n,2n) cross section
Calculated with POD code /6/.
MT= 17 (n,3n) cross section
Calculated with POD code /6/.
MT= 22 (n,na) cross section
Calculated with POD code /6/.
MT= 28 (n,np) cross section
Calculated with POD code /6/.
MT= 32 (n,nd) cross section
Calculated with POD code /6/.
MT=102 Capture cross section
Calculated with POD code /6/.
MT=103 (n,p) cross section
Calculated with POD code /6/.
MT=104 (n,d) cross section
Calculated with POD code /6/.
MT=105 (n,t) cross section
Calculated with POD code /6/.
MT=106 (n,He3) cross section
Calculated with POD code /6/.
MT=107 (n,a) cross section
Calculated with POD code /6/.
MT=203 (n,xp) cross section
Calculated with POD code /6/.
MT=204 (n,xd) cross section
Calculated with POD code /6/.
MT=205 (n,xt) cross section
Calculated with POD code /6/.
MT=206 (n,xHe3) cross section
Calculated with POD code /6/.
MT=207 (n,xa) cross section
Calculated with POD code /6/.
MF= 4 Angular distributions of emitted neutrons
MT= 2 Elastic scattering
Calculated with POD code /6/.
MF= 6 Energy-angle distributions of emitted particles
MT= 16 (n,2n) reaction
Neutron spectra calculated with POD/6/.
MT= 17 (n,3n) reaction
Neutron spectra calculated with POD/6/.
MT= 22 (n,na) reaction
Neutron spectra calculated with POD/6/.
MT= 28 (n,np) reaction
Neutron spectra calculated with POD/6/.
MT= 32 (n,nd) reaction
Neutron spectra calculated with POD/6/.
MT= 51 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 52 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 53 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 54 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 55 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 56 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 57 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 58 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 59 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 60 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 61 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 62 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 63 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 64 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 65 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 66 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 67 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 68 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 69 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 70 (n,n') reaction
Neutron angular distributions calculated with POD/6/.
MT= 91 (n,n') reaction
Neutron spectra calculated with POD/6/.
MT= 203 (n,xp) reaction
Proton spectra calculated with POD/6/.
MT= 204 (n,xd) reaction
Deuteron spectra calculated with POD/6/.
MT= 205 (n,xt) reaction
Triton spectra calculated with POD/6/.
MT= 206 (n,xHe3) reaction
He3 spectra calculated with POD/6/.
MT= 207 (n,xa) reaction
Alpha spectra calculated with POD/6/.
MF=12 Gamma-ray multiplicities
MT= 3 Non-elastic gamma emission
Calculated with POD code /6/.
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 with POD code /6/.
***************************************************************
* Nuclear Model Calculations with POD Code /6/ *
***************************************************************
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 preequilibrim 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.
2. Optical model parameters
Neutrons:
Coupled-channel optical model parameters /7/
Protons:
Koning and Delaroche /8/
Deuterons:
Lohr and Haeberli /9/
Tritons:
Becchetti and Greenlees /10/
He-3:
Becchetti and Greenlees /10/
Alphas:
Lemos /11/ potentials modified by Arthur and Young /12/
3. Level scheme of Mo- 94
-------------------------
No. Ex(MeV) J PI
-------------------------
0 0.00000 0 +
1 0.87110 2 +
2 1.57372 4 +
3 1.74250 0 +
4 1.86429 2 +
5 2.06762 2 +
6 2.12100 3 +
7 2.29520 4 +
8 2.32200 6 +
9 2.39322 2 +
10 2.42346 6 +
11 2.53410 3 -
12 2.56680 4 +
13 2.58000 3 -
14 2.61150 5 -
15 2.70300 3 -
16 2.73982 1 +
17 2.76810 4 +
18 2.80580 2 +
19 2.83590 3 -
20 2.85300 4 +
-------------------------
Levels above 2.86300 MeV are assumed to be continuous.
4. Level density parameters
Energy-dependent parameters of Mengoni-Nakajima /13/ were used
----------------------------------------------------------
Nuclei a* Pair Esh T E0 Ematch Elv_max
1/MeV MeV MeV MeV MeV MeV MeV
----------------------------------------------------------
Mo- 95 13.125 1.231 0.096 0.761 -0.609 6.814 1.808
Mo- 94 12.185 2.475 -0.706 0.937 -0.368 10.169 2.853
Mo- 93 12.764 1.244 -1.843 0.892 -0.799 7.716 2.755
Mo- 92 11.967 2.502 -2.668 0.919 1.160 8.213 3.962
Nb- 94 12.820 0.000 0.583 0.682 -1.167 4.340 1.257
Nb- 93 11.549 1.244 0.114 0.953 -1.794 9.243 1.950
Nb- 92 11.929 0.000 -1.398 0.865 -1.533 5.684 1.717
Zr- 92 11.702 2.502 -0.002 0.862 0.426 8.855 3.325
Zr- 91 11.895 1.258 -1.229 0.879 -0.489 7.274 3.167
Zr- 90 11.748 2.530 -1.944 0.719 2.381 5.622 4.223
----------------------------------------------------------
5. Gamma-ray strength functions
M1, E2: Standard Lorentzian (SLO)
E1 : Generalized Lorentzian (GLO) /14/
6. Preequilibrium process
Preequilibrium is on for n, p, d, t, He-3, and alpha.
Preequilibrium capture is on.
References
1) K.Shibata, A.Ichihara, S.Kunieda, J. Nucl. Sci. Technol.,
46, 278 (2009).
2) H.Weigmann et al., 1971 Knoxville, 749 (1971).
3) A.R.de L.Musgrove, Nucl. Phys., A270, 108 (1976).
4) T.F. Wang et al., Nucl. Instrum. Meth. Phys. Research B, 266,
561 (2008).
5) S.F. Mughabghab, "Atlas of Neutron Resonances," Elsevier
(2006).
6) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007).
7) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007).
8) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003).
9) J.M.Lohr, W.Haeberli, Nucl. Phys. A232, 381 (1974).
10) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization
Phenomena in Nuclear Reactions," p.682, The University
of Wisconsin Press (1971).
11) O.F.Lemos, Orsay Report, Series A, No.136 (1972).
12) E.D.Arthur, P.G.Young, LA-8626-MS (1980).
13) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151
(1994).
14) J.Kopecky, M.Uhl, Nucl. Sci. Eng. 41, 1941 (1990).