56-Ba-132
56-Ba-132 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091217
----JENDL-4.0 MATERIAL 5631
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
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Resonance parameters in JENDL-3.3 were revised for JENDL-4.
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JENDL-3.2 data were automatically transformed to JENDL-3.3.
Interpolation of spectra: 22 (unit base interpolation)
(3,251) deleted, T-matrix of (4,2) deleted, and others.
===========================================================
History
90-03 New evaluation for JENDL-3 was completed by JNDC FPND
W.G./1/
10-03 JENDL-4.0 was made.
Unresolved resonance parameters were evaluated by S.Kunieda.
The LSSF=1 was applied.
Compiled by S.Kunieda
***** modified parts for JENDL-4.0 ********************
(1,451) Updated.
(2,151) Unresolved resonance parameters were updated.
(3,1) Re-calculated from partial cross sections.
(3,2) Calculated from URP in lower energy range.
(3,4) Re-calculated from partial cross sections.
(3,102) Calculated from URP in lower energy range.
***********************************************************
mf = 1 General information
mt=451 Comments and dictionary
mf = 2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
No resolved resonance parameters
Only resonance energies were available/2/.
Unresolved resonance region : 68 eV - 100 keV
The neutron strength functions, S0, S1 and S2 were calculated
with optical model code CASTHY/3/. The observed level spacing
was determined to reproduce the capture cross section
calculated with CASTHY. The effective scattering radius was
obtained from fitting to the calculated total cross section at
100 keV. The radiation width Gg was based on the systematics
of measured values for neighboring nuclides.
Typical values of the parameters at 70 keV:
S0 = 0.510e-4, S1 = 0.880e-4, S2 = 0.590e-4, Sg = 24.3e-4,
Gg = 0.120 eV, R = 5.308 fm.
***************************************************************
For JENDL-4.0, the unresolved resonance parameters were
re-evaluated by the ASREP /22/ code so as to reproduce the
total and capture cross sections given in JENDL3.3 in the
energy region from 68 eV to 200 keV. The parameters
should be used only for self-shielding calculations.
***************************************************************
Thermal cross sections & resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 1.03479E+01
Elastic 3.31402E+00
n,gamma 7.00306E+00 3.12032E+01
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(*) Integrated from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 68 eV, the capture and elastic scattering cross sections
were assumed to be in 1/v form and constant, respectively. The
capture cross section at 0.0253 eV was taken from Ref./2/, and
the elastic scattering cross section was estimated by assuming
r = 5.2 fm. Unresolved resonance parameters were given in the
energy range from 68 eV to 100 keV.
Above 100 keV, the spherical optical and statistical model
calculation was performed with CASTHY, by taking account of
competing reactions, of which cross sections were calculated
with PEGASUS/4/ standing on a preequilibrium and multi-step
evaporation model. The OMP's for neutron given in Table 1 were
determined to reproduce a systematic trend of the total cross
section by changing Ws and rso of Iijima-Kawai potential/5/.
The OMP's for charged particles are as follows:
proton = Perey/6/
alpha = Huizenga and Igo/7/
deuteron = Lohr and Haeberli/8/
helium-3 and triton = Becchetti and Greenlees/9/
Parameters for the composite level density formula of Gilbert
and Cameron/10/ were evaluated by Iijima et al./11/ More
extensive determination and modification were made in the
present work. Table 2 shows the level density parameters used
in the present calculation. Energy dependence of spin cut-off
parameter in the energy range below E-joint is due to Gruppelaar
/12/.
mt = 1 Total
Spherical optical model calculation was adopted.
mt = 2 Elastic scattering
Calculated as (total - sum of partial cross sections).
mt = 4, 51 - 91 Inelastic scattering
Spherical optical and statistical model calculation was
adopted. The level scheme was based on Evaluated Nuclear
Structure Data File (1987 version)/13/ and Nuclear Data
Sheets/14/.
no. energy(MeV) spin-parity dwba cal.
gr. 0.0 0 +
1 0.4646 2 + *
2 1.0317 2 +
3 1.1276 4 +
4 1.5030 0 +
5 1.5112 3 +
6 1.6858 2 +
7 1.7294 4 +
8 1.9328 6 +
9 1.9982 1 +
10 2.0270 3 - *
Levels above 2.046 MeV were assumed to be overlapping.
For the levels with an asterisk, the contribution of direct
inelastic scattering cross sections was calculated by the
DWUCK-4 code/15/. Deformation parameters (beta2 = 0.186 and
beta3 = 0.070) were based on the data compiled by Raman et
al./16/ and Spear/17/, respectively.
mt = 102 Capture
Spherical optical and statistical model calculation with
CASTHY was adopted. Direct and semi-direct capture cross
sections were estimated according to the procedure of Benzi
and Reffo/18/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (2.387e-03) was determined
from the systematics.
mt = 16 (n,2n) cross section
mt = 17 (n,3n) cross section
mt = 22 (n,n'a) cross section
mt = 28 (n,n'p) cross section
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,alpha) cross section
These reaction cross sections were calculated with the
preequilibrium and multi-step evaporation model code PEGASUS.
The Kalbach's constant k (= 143.0) was estimated by the
formula derived from Kikuchi-Kawai's formalism/19/ and level
density parameters.
Finally, the (n,2n), (n,p) and (n,alpha) cross sections were
normalized to the following values at 14.5 MeV:
(n,2n) 1600.00 mb (recommended by Bychkov+/20/)
(n,p) 13.90 mb (systematics of Forrest/21/)
(n,alpha) 4.84 mb (systematics of Forrest)
mt = 251 mu-bar
Calculated with CASTHY/3/.
mf = 4 Angular distributions of secondary neutrons
Legendre polynomial coefficients for angular distributions are
given in the center-of-mass system for mt=2 and discrete inelas-
tic levels, and in the laboratory system for mt=91. They were
calculated with CASTHY. Contribution of direct inelastic
scattering was calculated with DWUCK-4. For other reactions,
isotropic distributions in the laboratory system were assumed.
mf = 5 Energy distributions of secondary neutrons
Energy distributions of secondary neutrons were calculated with
PEGASUS for inelastic scattering to overlapping levels and for
other neutron emitting reactions.
TABLE 1 NEUTRON OPTICAL POTENTIAL PARAMETERS
DEPTH (MEV) RADIUS(FM) DIFFUSENESS(FM)
---------------------- ------------ ---------------
V = 41.8 R0 = 6.89 A0 = 0.62
WS = 2.95+0.789E RS = 7.098 AS = 0.35
VSO= 7.0 RSO= 6.89 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
54-XE-128 1.800E+01 5.830E-01 5.017E-01 6.396E+00 2.210E+00
54-XE-129 1.936E+01 5.729E-01 5.108E+00 5.590E+00 1.120E+00
54-XE-130 1.671E+01 6.600E-01 8.841E-01 7.427E+00 2.320E+00
54-XE-131 1.740E+01 6.000E-01 3.176E+00 5.394E+00 1.120E+00
55-CS-129 * 1.763E+01 5.798E-01 2.754E+00 5.088E+00 1.090E+00
55-CS-130 * 1.735E+01 5.774E-01 1.541E+01 3.856E+00 0.0
55-CS-131 * 1.705E+01 5.750E-01 1.633E+00 4.913E+00 1.200E+00
55-CS-132 * 1.676E+01 5.726E-01 1.123E+01 3.569E+00 0.0
56-BA-130 1.850E+01 6.240E-01 6.573E-01 7.832E+00 2.670E+00
56-BA-131 1.990E+01 6.090E-01 5.764E+00 6.979E+00 1.580E+00
56-BA-132 1.850E+01 6.360E-01 6.996E-01 8.187E+00 2.780E+00
56-BA-133 1.941E+01 5.930E-01 3.357E+00 6.465E+00 1.580E+00
---------------------------------------------------------------
syst: * = ldp's were determined from systematics.
Spin cutoff parameters were calculated as 0.146*sqrt(a)*a**(2/3).
In the CASTHY calculation, spin cutoff factors at 0 MeV were
assumed to be 6.425 for Ba-132 and 5.0 for Ba-133.
References
1) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science
and Technology, Mito, p. 569 (1988).
2) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I,
Part A", Academic Press (1981).
3) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975).
4) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).
5) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77
(1983).
6) Perey, F.G: Phys. Rev. 131, 745 (1963).
7) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).
8) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).
9) Becchetti, F.D., Jr. and Greenlees, G.W.: Polarization
Phenomena in Nuclear Reactions ((Eds) H.H. Barshall and
W. Haeberli), p. 682, the University of Wisconsin Press.
(1971).
10) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446
(1965).
11) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).
12) Gruppelaar, H.: ECN-13 (1977).
13) ENSDF: Evaluated Nuclear Structure Data File (June 1987).
14) Nuclear Data Sheets, 17, 225 (1976).
15) Kunz, P.D.: private communication.
16) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1
(1987)
17) Spear, R.H.: Atom. Data and Nucl. Data Table, 42, 55 (1989).
18) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
19) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
20) Bychkov, V.M. et al.: INDC(CCP)-146/LJ (1980).
21) Forrest, R.A.: AERE-R 12419 (1986).
22) Y.Kikuchi et al., JAERI-Data/Code 99-025 (1999)
[in Japanese].