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74-W -186 KHI,NEDAC EVAL-MAR87 T.WATANABE(KHI), T.ASAMI(NEDAC)
DIST-JAN09 20090105
----JEFF-311 MATERIAL 7443
-----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)
94-02 JENDL fusion file
95-10 Inelastic scattering cross sections were revised.
96-10 ddx's of charged particles were corrected.
Comments modified.
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 *****
(2,151) modified
(3,2) re-calculated
(3,16) revised
(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
(12,22,51-62,102,107) evaluated newly
(13,3) evaluated newly
(14,3,22,51-62,102,107) isotropic distributions
(15,3,22,102,107) 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 60 milli-eV was assumed.
Radius was assumed to be 7.64 fermi/8/.
In JENDL-3.3 to make a good fit to resonance integrals, the
negative resonance were removed and the radiative width of
18.8 eV resonance was modified.
Calculated 2200 m/sec cross sections and resonance integrals
are as follows:
2200 m/s cross section(b) res. integral(b)
elastic 0.93
capture 39.45 529.
total 40.38
mf=3 Neutron cross sections
Below 15 keV, zero 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 evaluated resolved resona-
nce 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 JENDL-3.1.
mt=2 Elastic scattering
Obtained by subtracting the sum of the partial cross sections
from the total cross section.
mt=4, 51-62, 91 Inelastic scattering
The data of mt=51 to 62 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 0.1226 2+ *
2 52 0.3968 4+ *
3 53 0.7377 2+
4 54 0.8088 6+ *
5 55 0.8618 3+
6 56 0.8820 0+
7 57 0.9526 2-
8 58 1.0070 2+
9 59 1.0316 4+
10 60 1.0452 3-
11 61 1.1500 0+
12 62 1.2840 2+
13 62 1.2980 2+
14 62 1.3220 2+
Levels above 1.323 MeV were assumed to be overlapping. Data
given in mt=62 are sum of cross sections of 12th - 14th levels.
The direct inelastic scattering cross section was calculated
also for the levels at 1.384, 2.002, 2.588, 3.0, 3.5, 4.0, 5.0,
5.5 and 6.0 MeV, and added to mt=91.
mt=16 (n,2n)
Calculated with the scincros-ii system/2/ newly.
mt=17, 22, 28, 103, 104, 107
(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
1.9 b at 14. MeV measured by Frehaut/17/,
(n,3n) 0.058 b at 14.76MeV measured by Frehaut/17/,
(n,p) 0.0014 b at 14.7 MeV measured by Qaim/16/,
(n,d)+(n,np) 0.00025 b at 14.7 MeV measured by Qaim/16/,
0.00034 b at 14.87MeV measured by Kasugai/18/,
(n,a) 0.00076 b at 14.87MeV measured by Kasugai/18/,
0.00055 b at 14.7 MeV measured by Qaim/16/.
mt=102 Capture
Below 15 keV, reproduced from the evaluated resolved resona-
nce parameters.
Above 15 keV, calculated with the casthy code/9/ and normalized
to 49+-6 mb at 500 kev/19/. Above 3 MeV, a straight line in
log-log scalewas adopted assuming 1.0 mb at 14 MeV (based on
experimental data stored in EXFOR) 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, 51-62: the same as JENDL-3.1)
mt=2
Calculated with the casthy code/9/.
mt=51-62
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/1,20/.
mf=12 Photon production multiplicities and transition probability
arrays
mt=51-62,102,107
Below 1.33018 MeV, given as multiplicities
Calculated with the egnash code/2/ and processed by the
gamfil2 code/21/.
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/21/.
mf=14 Photon angular distributions
mt=3,51-62, 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. 2, 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) Kasugai Y. et al.: JAERI-M 93-046, p.277 (1993).
19) Voignier J. et al.: Nucl. Sci. Eng., 93, 43 (1986).
20) Kalbach C. : Phys. Rev. C37, 2350(1988).
21) Hida K.: JAERI-M 86-150 (1986) (in Japanese).
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