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74-W -184 KHI,NEDAC EVAL-MAR87 T.WATANABE(KHI), T.ASAMI(NEDAC)
DIST-JAN09 20090105
----JEFF-311 MATERIAL 7437
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
*************************** JEFF-3.1.1 *************************
** **
** Original data taken from: JEFF-3.1 **
** **
******************************************************************
***************************** JEFF-3.1 *************************
** **
** Original data taken from: JENDL-3.3 **
** **
******************************************************************
HISTORY
87-03 New evaluation was made for JENDL-3.
87-03 Compiled by T.Asami.
94-01 JENDL-3.2.
Compiled by T.Nakagawa (ndc/jaeri)
00-03 Reevaluation was made by T.Asami.
01-11 Compiled by K.Shibata (ndc/jaeri)
***** modified parts for JENDL-3.3 from JENDL-3.2 ******
(3,2) re-calculated
(3,203,204,207) added
(3,251) deleted
(4,2) transformation matrix deleted
(4,16,17,22,28,91) deleted
(5,16,17,22,28,91) deleted
(6,16,17,22,28,91) taken from JENDL fusion file
(6,203,204,207) taken from JENDL fusion file
(12,51-107) evaluated newly
(13,3) evaluated newly
(14,3-107) isotropic distributions
(15,3,102,107) evaluated newly
***********************************************************
The JENDL fusion file /1/ and the modification of JENDL-3.2
from JENDL-3.1 as follows:
-------------------------------------------------------------
JENDL fusion file /1/ (as of Jan. 1994)
Evaluated by K.Kosako (nedac) and S. Chiba (ndc/jaeri)
Compiled by K.Kosako.
Data were taken from JENDL-3.1 except for the following:
- The inelastic scattering cross sections to cotinuum
(mt=91) was calculated with casthy2y and dwucky in
sincros-ii system/2/ including contributions from direct
reactions.
- The (n,2n), (n,3n), (n,na), (n,np), (n,p), (n,d) and
(n,a) reaction cross sections (mt=16, 17, 22, 28, 103,
104, 107) were calculated by egnash2 in the sincros-ii.
- Energy distributions of secondary neutrons were replaced
by those calculated by egnash2. The ddx's of the
continuum neutrons were calculated by Kumabe's systema-
tics /3/ using f15tob /1/. The precompound/compound
ratio was calculated by the sincros- ii code system.
- Optical-model, level density and other parameters used in
the sincros-ii calculation are described in ref./2/.
Level schemes were determined on the basis of ENSDF/4/.
For JENDL-3.2, all cross section data except for the total,
elastic scattering and capture were adopted from JENDL fusion
file. The calculation was made with sincros-ii system/2/ by
adopting Walter-Guss omp modified by Yamamuro/2/ for neutron,
Perey omp /12/ for proton, Lemos omp modified by Arthur and
Young/13/ for alpha, Lohr-Haeberli omp/14/ for deuteron,
Becchettii-Greenlees omp/15/ for triton and he-3, and standard
level density parameters of sincros-ii system.
-------------------------------------------------------------
mf=1 General information
mt=451 Descriptive data and dictionary
mf=2 Resonance parameters
mt=151 Resolved resonance parameters
Resolved parameters for mlbw formula were given in the energy
region from 1.0e-5 eV to 15 keV. Parameters were evaluated in
examining both the experimental data/5,6,7/ and the recommended
data of bnl/8/. For unknown radiative width, an average value
of 57 milli eV was assumed. Parameters for negative resonance
were selected so that the 2200 m/s cross section for capture
reproduced gave a recommended value of 1.7 barns/8/ and gave a
good fit to the experimental data for total cross sections
around thermal energies. The scattering radius was assumed to
be 7.5 fermi. Calculated 2200 m/sec cross sections and
resonance integrals are as follows:
2200 m/s cross section(b) res. integral(bv)
elastic 7.35
capture 1.70 16.2
total 9.05
mf=3 Neutron cross sections
Below 15 keV, no background cross section was given and all
the cross-section data are reproduced from the evaluated
resolved resonance parameters with MLBW formula.
For JENDL-3.1, above 15 keV, the total and partial cross
sections were given mainly based on the theoretical calcula-
tions. The total, elastic and inelastic scattering, and capture
cross sections were calculated with the coupled-channel model
and the spherical optical-statistical model. The calculations
were performed with a combined program of casthy/9/ and ecis
/10/. The spherical optical potential parameters used are:
V = 48.83 - 0.0809*En, Vso = 5.6 (MeV)
Ws = 6.73 - 0.0536*En, Wv = 0 (MeV)
r = 1.168, rs = 1.268, rso = 1.592 (fm)
a = 0.617, aso = 0.664, b = 0.563 (fm)
The deformed potential parameters were taken from the work of
Delaroche/11/.
mt=1 Total
Below 15 keV, reproduced from the resonance parameters.
Above 15 keV, optical and statistical model calculation was
made with the casthy code/9/. The above-mentioned omp was used.
almost the same as JENDL3.1.
mt=2 Elastic scattering
Obtained by subtracting the sum of the partial cross sections
from the total cross section.
mt=4, 51-60, 91 Inelastic scattering
The data of mt=51 to 60 were calculated with the combined
program of casthy /9/ and ecis/10/. These cross sections in
JENDL-3.2 are the same as JENDL-3.1 except that new calculation
was made at additional several energy points. The cross
section of mt=91 was calculated with sincros-ii for JENDL
fusion file. The level scheme was based on ref./4/
contributions of the direct process were calculated for the
levels marked with '*'.
no. mt energy(MeV) spin-parity (direct process)
g.s. 0.0 0+
1 51 0.1112 2+ *
2 52 0.3641 4+ *
3 53 0.7483 6+ *
4 54 0.9033 2+
5 55 1.0023 0+
6 56 1.0059 3+
7 57 1.1214 2+
8 57 1.1300 2-
9 57 1.1338 4+
10 58 1.2213 3-
11 59 1.2850 5-
12 59 1.2941 5+
13 60 1.3221 0+
14 60 1.3453 4-
15 60 1.3590 4+
16 60 1.3863 2+
17 60 1.4250 3+
18 60 1.4310 2+
Levels above 1.4320 MeV were assumed to be overlapping. Data
of levels 7-9, 11-12 and 13-18 were lumped as is indicated in
the above table. The direct inelastic scattering cross
section was calculated also for the levels at 1.501, 1.861,
2.126, 2.519, 2.919, 3.1, 3.455, 3.972, 4.5, 5.0 and 5.5 MeV,
and added to mt=91.
mt=16, 17, 22, 28, 103, 104, 107
(n,2n), (n,3n), (n,na), (n,np), (n,p), (n,d), (n,a)
Adopted from JENDL fusion file. Theoretical calculation was
made with sincros-ii. The results were normalized to
(n,2n) 2.162 b at 14.7 MeV (systematics of Qaim/16/),
1.93 b at 14. MeV measured by Frehaut/17/,
(n,3n) 0.022 b at 14.76MeV measured by Frehaut/17/,
(n,p) 0.00334 b at 14.96MeV measured by Ikeda/18/,
0.0029 b at 14.7 MeV measured by Qaim/16/,
(n,d)+(n,np) 0.00065 b at 14.7 MeV measured by Qaim/16/,
(n,a) 0.00079 b at 14.28MeV measured by Kasugai/19/,
0.00115 b at 14.7 MeV measured by Qaim/16/.
mt=102 Capture
Below 15 keV, reproduced from the resonance parameters.
Above 15 keV, calculated with the casthy code/9/ and normalized
to 49+-6 mb at 500 keV/20/. Above 3 MeV, a straight line in
log-log scale was adopted assuming 1.0 mb at 14 MeV for JENDL-
3.2.
mt=203 Total proton production
Sum of mt=28 and 103.
mt=204 Total deuteron production
Equal to mt=104.
mt=207 Total alpha production
Sum of mt=22 and 107.
mf=4 Angular distributions of secondary neutrons
(mt=2, 51-60: the same as JENDL-3.1)
mt=2
Calculated with the casthy code/9/.
mt=51-60
Calculated with the combined program of the casthy/9/ and
ecis/10/ codes.
mf=6 Energy-angle distributions of secondary particles
mt=16, 17, 22, 28, 91
Based on Kumabe's systematics/1,3/.
mt=203,204,207
Based on Kalbach's systematics/1,21/.
mf=12 Photon production multiplicities and transition probability
arrays
mt=51-60,102,107
Below 1.43985 MeV, given as multiplicities
calculated with the egnash code/2/ and processed by the
gamfil2 code/22/.
mt=102 was calculated with the casthy code/10/.
mf=13 Photon production cross sections
mt=3
Calculated with the egnash code/2/ and processed by the
gamfil2 code/20/.
mf=14 Photon angular distributions
mt=3, 51-60, 102, 107
Assumed to be isotropic distributions
mf=15 Continuous photon energy spectra
mt=3,107
Calculated with the egnash code/2/.
mt=102
Calculated with the casthy code/10/.
References
1) Chiba, S. et al.: JAERI-M 92-027, p.35 (1992).
2) Yamamuro, N.: JAERI-M 90-006 (1990).
3) Kumabe, I. et al.: Nucl. Sci. Eng., 104, 280 (1990).
4) ENSDF: Evaluated Nuclear Structure Data File, BNL/NNDC.
5) Camarda H.S. et al. : Phys. Rev. C8, 1813 (1973).
6) Ohkubo M. : JAERI-M 5624 (1974).
7) Macklin R.L. et al. : LA-9200-MS (1982).
8) Mughabghab S.F.:"Neutron Cross Sections", Vol. 1, Part B
(1984).
9) Igarasi S. and Fukahori T.: JAREI 1321 (1991).
10) Raynal J. : IAEA-SMR-9/8 p.281 (1972).
11) Delaroche J.F. et al. : 1979 Knoxville Conf. 336 (1979).
12) Perey F.G.: Phys. Rev., 131, 745 (1963).
13) Arthur, E.D. and Young, P.G.: LA-8626-MS (1980).
14) Lohr J.M. and Haeberli W.: Nucl. Phys., A232, 381 (1974).
15) Becchetti F.D. Jr. and Greenlees G.W.: "Polarization
Phenomena in Nucl. Reactions," Univ. Wisconsin Press, p.682
(1971).
16) Qaim S.M. and Graca C.: Nucl. Phys., A242, 317 (1975).
17) Frehaut J. et al.: 1980 BNL symposium, BNL-NCS-51245, Vol. 1,
p.399 (1980).
18) Ikeda Y. et al.: JAERI 1312 (1988).
19) Kasugai Y. et al.: JAERI-M 93-046, p.277 (1993).
20) Voignier J. et al.: Nucl. Sci. Eng., 93, 43 (1986).
21) Kalbach C. : Phys. Rev. C37, 2350(1988).
22) Hida K.: JAERI-M 86-150 (1986) (in Japanese).
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