53-I -131
53-I -131 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091112
----JENDL-4.0 MATERIAL 5337
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
===========================================================
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/
09-09 The uresolved resonance parameters were recalcualted up to
160 keV. The total cross section was recalcualted from
partial cross sections.
The data were compiled by K.Shibata (jaea).
mf = 1 General information
mt=451 Comments and dictionary
mf = 2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
No resolved resonance parameters
Unresolved resonance region : 30 eV - 160 keV
The parameters were obtained by fitting to the total and
capture cross sections calculated with the CASTHY code /2/.
The parameters obtained 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 8.3669E+01
Elastic 3.6146E+00
n,gamma 8.0035E+01 7.7809E+01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 30 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./3/,
and the scattering cross section was estimated from r = 5.4 fm.
Above 30 eV, 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 r0 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
gr. 0.0 7/2 +
1 0.1497 5/2 +
2 0.4927 3/2 +
3 0.6020 5/2 +
4 0.7737 11/2 +
5 0.8522 9/2 +
6 0.8767 1/2 +
7 1.0058 7/2 +
8 1.0597 9/2 +
9 1.0983 3/2 +
10 1.1469 5/2 +
11 1.1489 7/2 +
12 1.2840 5/2 +
13 1.2982 3/2 +
14 1.3152 9/2 +
15 1.3465 1/2 +
Levels above 1.377 MeV were assumed to be overlapping.
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/15/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (1.97e-03) was determined from
the systematics of radiation width (0.12 eV) and the average
s-wave resonance level spacing (60.7 eV) calculated from the
level density parameters.
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 = 32 (n,n'd) cross section
mt = 33 (n,n't) cross section
mt =103 (n,p) cross section
mt =104 (n,d) cross section
mt =105 (n,t) 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 (= 274.9) was estimated by the
formula derived from Kikuchi-Kawai's formalism/16/ 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) 1710.00 mb (systematics of Wen Den Lu+/17/)
(n,p) 1.99 mb (systematics of Forrest/18/)
(n,alpha) 1.10 mb (systematics of Forrest)
mt = 251 mu-bar
Calculated with CASTHY.
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. For other reactions, isotropic distri-
butions 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 = 45.97-0.199E R0 = 6.481 A0 = 0.62
WS = 6.502 RS = 6.926 AS = 0.35
VSO= 7.0 RSO= 6.49 ASO= 0.62
THE FORM OF SURFACE ABSORPTION PART IS DER. WOODS-SAXON TYPE.
TABLE 2 LEVEL DENSITY PARAMETERS
NUCLIDE A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
51-SB-127 1.700E+01 5.120E-01 6.326E-01 3.902E+00 1.200E+00
51-SB-128 1.468E+01 5.600E-01 4.264E+00 2.658E+00 0.0
51-SB-129 1.596E+01 5.040E-01 5.308E-01 3.333E+00 1.040E+00
51-SB-130 1.566E+01 5.000E-01 3.630E+00 2.154E+00 0.0
52-TE-128 1.800E+01 6.090E-01 6.586E-01 7.010E+00 2.340E+00
52-TE-129 2.015E+01 5.350E-01 3.588E+00 5.141E+00 1.140E+00
52-TE-130 1.800E+01 5.470E-01 2.657E-01 5.735E+00 2.180E+00
52-TE-131 1.846E+01 5.360E-01 1.800E+00 4.651E+00 1.140E+00
53-I -129 1.720E+01 6.200E-01 3.436E+00 5.762E+00 1.200E+00
53-I -130 1.640E+01 6.000E-01 1.297E+01 3.896E+00 0.0
53-I -131 1.600E+01 6.330E-01 2.958E+00 5.342E+00 1.040E+00
53-I -132 1.550E+01 6.000E-01 8.595E+00 3.552E+00 0.0
---------------------------------------------------------------
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 6.433 for I -131 and 5.0 for I -132.
References
1) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science
and Technology, Mito, p. 569 (1988).
2) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975).
3) Mughabghab, S.F. et al.: "Neutron Cross Sections, Vol. I,
Part A", Academic Press (1981).
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, 573 (1976).
15) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
16) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
17) Wen Den Lu and Fink, R.W.: Phys. Rev., C4, 1173 (1971).
18) Forrest, R.A.: AERE-R 12419 (1986).