34-Se- 77 JAEA EVAL-MAY09 S.Kamada, K.Shibata, A.Ichihara+
DIST-MAY10 20091117
----JENDL-4.0 MATERIAL 3434
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
History
09-05 Evaluated by S. Kamada (TIT), K. Shibata (JAEA), A. Ichihara
(JAEA) and S. Kunieda (JAEA).
09-10 Compiled by K. Shibata.
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 2.7 keV
In JENDL-3.3, resonance parameters were based on Mughabghab
et al./1/ Total spin J of some resonances was tentatively
estimated with a random number method. Neutron orbital
angular momentum L of some resonances was estimated with a
method of Bollinger and Thomas/2/. Average radiation
width of 380 meV was obtained by taking the weighted average
of radiation widths for 17 resonance levels, and was adopted
for the levels whose radiation width was unknown.
Scattering radius was also taken from Mughabghab et al.
A negative resonance was added so as to reproduce the
thermal capture and scattering cross sections given by
Mughabghab et al.
In JENDL-4, the resonances at 112.0, 211.6, 340.8, and 864.0
eV were regarded as p-wave by considering the work of Engler
et al./3/ A radius was changed to 7.2 fm.
Unresolved resonance region: 2.7 keV - 500 keV
The parameters were obtained by fitting to the total and
capture cross sections calculated from POD /4/. 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 4.9473E+01
Elastic 8.4602E+00
n,gamma 4.1013E+01 3.1263E+01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
MF= 3 Neutron cross sections
MT= 1 Total cross section
Calculated with POD code /4/.
MT= 2 Elastic scattering cross section
Obtained by subtracting non-elastic cross sections from total
cross sections.
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 /4/.
MT= 16 (n,2n) cross section
Calculated with POD code /4/.
MT= 17 (n,3n) cross section
Calculated with POD code /4/.
MT= 22 (n,na) cross section
Calculated with POD code /4/.
MT= 28 (n,np) cross section
Calculated with POD code /4/.
MT= 32 (n,nd) cross section
Calculated with POD code /4/.
MT=102 Capture cross section
Calculated with POD code /4/.
MT=103 (n,p) cross section
Calculated with POD code /4/.
MT=104 (n,d) cross section
Calculated with POD code /4/.
MT=105 (n,t) cross section
Calculated with POD code /4/.
MT=106 (n,He3) cross section
Calculated with POD code /4/.
MT=107 (n,a) cross section
Calculated with POD code /4/.
MT=203 (n,xp) cross section
Calculated with POD code /4/.
MT=204 (n,xd) cross section
Calculated with POD code /4/.
MT=205 (n,xt) cross section
Calculated with POD code /4/.
MT=206 (n,xHe3) cross section
Calculated with POD code /4/.
MT=207 (n,xa) cross section
Calculated with POD code /4/.
MF= 4 Angular distributions of emitted neutrons
MT= 2 Elastic scattering
Calculated with POD code /4/.
MF= 6 Energy-angle distributions of emitted particles
MT= 16 (n,2n) reaction
Neutron spectra calculated with POD/4/.
MT= 17 (n,3n) reaction
Neutron spectra calculated with POD/4/.
MT= 22 (n,na) reaction
Neutron spectra calculated with POD/4/.
MT= 28 (n,np) reaction
Neutron spectra calculated with POD/4/.
MT= 32 (n,nd) reaction
Neutron spectra calculated with POD/4/.
MT= 51 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 52 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 53 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 54 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 55 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 56 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 57 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 58 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 59 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 60 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 61 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 62 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 63 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 64 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 65 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 66 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 67 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 68 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 69 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 70 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 71 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 72 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 73 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 74 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 75 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 76 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 77 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 78 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 79 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 80 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 81 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 82 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 83 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 84 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 85 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 86 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 87 (n,n') reaction
Neutron angular distributions calculated with POD/4/.
MT= 91 (n,n') reaction
Neutron spectra calculated with POD/4/.
MT= 203 (n,xp) reaction
Proton spectra calculated with POD/4/.
MT= 204 (n,xd) reaction
Deuteron spectra calculated with POD/4/.
MT= 205 (n,xt) reaction
Triton spectra calculated with POD/4/.
MT= 206 (n,xHe3) reaction
He3 spectra calculated with POD/4/.
MT= 207 (n,xa) reaction
Alpha spectra calculated with POD/4/.
MF=12 Gamma-ray multiplicities
MT= 3 Non-elastic gamma emission
Calculated with POD code /4/.
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 /4/.
***************************************************************
* Nuclear Model Calculations with POD Code /4/ *
***************************************************************
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 /5/
Protons:
Koning and Delaroche /6/
Deuterons:
Lohr and Haeberli /7/
Tritons:
Becchetti and Greenlees /8/
He-3:
Becchetti and Greenlees /8/
Alphas:
Lemos /9/ potentials modified by Arthur and Young /10/
3. Level scheme of Se- 77
-------------------------
No. Ex(MeV) J PI
-------------------------
0 0.00000 1/2 -
1 0.16192 7/2 +
2 0.17531 9/2 +
3 0.23900 3/2 -
4 0.24979 5/2 -
5 0.30115 5/2 +
6 0.43945 5/2 -
7 0.52064 3/2 -
8 0.58101 7/2 -
9 0.68010 5/2 +
10 0.79615 7/2 +
11 0.80819 7/2 -
12 0.81786 1/2 -
13 0.82443 5/2 -
14 0.91153 3/2 +
15 0.94698 1/2 +
16 0.97004 11/2 +
17 0.97830 9/2 -
18 0.99920 5/2 +
19 1.00518 3/2 -
20 1.02414 13/2 +
21 1.12664 11/2 +
22 1.12811 1/2 +
23 1.13246 7/2 +
24 1.17248 9/2 -
25 1.17930 9/2 -
26 1.18698 3/2 -
27 1.19310 9/2 +
28 1.23062 5/2 -
29 1.25296 5/2 +
30 1.28280 7/2 -
31 1.35157 11/2 -
32 1.36427 5/2 +
33 1.40249 3/2 -
34 1.41163 3/2 -
35 1.43900 3/2 +
36 1.48824 3/2 -
37 1.51102 3/2 -
-------------------------
Levels above 1.52102 MeV are assumed to be continuous.
4. Level density parameters
Energy-dependent parameters of Mengoni-Nakajima /11/ were used
----------------------------------------------------------
Nuclei a* Pair Esh T E0 Ematch Elv_max
1/MeV MeV MeV MeV MeV MeV MeV
----------------------------------------------------------
Se- 78 9.830 2.717 3.184 0.927 -0.352 10.456 3.090
Se- 77 10.361 1.368 3.763 0.856 -1.590 8.612 1.511
Se- 76 10.198 2.753 3.354 0.862 0.003 9.763 3.009
Se- 75 10.143 1.386 3.710 0.907 -1.986 9.353 1.432
As- 77 9.864 1.368 3.386 0.907 -1.622 8.902 1.676
As- 76 9.954 0.000 3.702 0.933 -3.511 8.279 0.669
As- 75 9.648 1.386 3.768 0.921 -1.771 9.165 1.430
Ge- 75 9.958 1.386 3.393 0.852 -1.123 8.044 1.603
Ge- 74 9.691 2.790 3.220 0.910 -0.065 10.140 2.711
Ge- 73 10.618 1.404 3.764 0.886 -2.153 9.468 0.994
----------------------------------------------------------
5. Gamma-ray strength functions
M1, E2: Standard Lorentzian (SLO)
E1 : Generalized Lorentzian (GLO) /12/
6. Preequilibrium process
Preequilibrium is on for n, p, d, t, He-3, and alpha.
Preequilibrium capture is on.
References
1) S.F.Mughabghab et al.: "Neutron Cross Sections, Vol. I,
Part A", Academic Press (1981).
2) L.M.Bollinger, G.E.Thomas, Phys. Rev., 171,1293 (1968).
3) G.Engler et al., Nucl. Phys., A372, 125 (1981).
4) A.Ichihara et al., JAEA-Data/Code 2007-012 (2007).
5) S.Kunieda et al., J. Nucl. Sci. Technol. 44, 838 (2007).
6) A.J.Koning, J.P.Delaroche, Nucl. Phys. A713, 231 (2003).
7) J.M.Lohr, W.Haeberli, Nucl. Phys. A232, 381 (1974).
8) F.D.Becchetti,Jr., G.W.Greenlees, "Polarization
Phenomena in Nuclear Reactions," p.682, The University
of Wisconsin Press (1971).
9) O.F.Lemos, Orsay Report, Series A, No.136 (1972).
10) E.D.Arthur, P.G.Young, LA-8626-MS (1980).
11) A.Mengoni, Y.Nakajima, J. Nucl. Sci. Technol. 31, 151
(1994).
12) J.Kopecky, M.Uhl, Nucl. Sci. Eng. 41, 1941 (1990).