53-I -129
53-I -129 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091112
----JENDL-4.0 MATERIAL 5331
-----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
84-10 Evaluation for JENDL-2 was made by JNDC FPND W.G./1/
90-03 Modification for JENDL-3 was made/2/.
09-09 The resolved resonance parameters were taken from the work
of Noguere et al./3/ with a modification. The total
cross section was recalculated 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
Resolved resonance region (RM formula): below 5.1 keV
The present evaluation is based on the JEFF-3.1 data
obtained by Noguere et al./3/ The energy of a negative
resonance was changed to -177.1 eV so as to reproduce the
the thermal capture cross section of 30.3+-1.2 b measured
by Nakamura et al./4/
Unresolved resonance region : 5.1 keV - 100 keV
The parameters were adjusted to reproduce the capture cross
section measured by Macklin /5/ and the total cross
section calculated with CASTHY /6/. The 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 3.4654E+01
Elastic 4.3365E+00
n,gamma 3.0317E+01 3.3250E+01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 5.1 keV, resonance parameters were given.
Above 5.1 keV, the spherical optical and statistical model
calculation was performed with CASTHY/6/, by taking account of
competing reactions, of which cross sections were calculated
with PEGASUS/7/ 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, changed from r0 and rso of Iijima and Kawai/8/. The
OMP's for charged particles are as follows:
proton = Perey/9/
alpha = Huizenga and Igo/10/
deuteron = Lohr and Haeberli/11/
helium-3 and triton = Becchetti and Greenlees/12/
Parameters for the composite level density formula of Gilbert
and Cameron/13/ were evaluated by Iijima et al./14/ 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
/15/.
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 taken from Ref./16/
no. energy(MeV) spin-parity
gr. 0.0 7/2 +
1 0.0278 5/2 +
2 0.2784 3/2 +
3 0.4874 5/2 +
4 0.5596 1/2 +
5 0.6960 11/2 +
6 0.7296 9/2 +
7 0.7689 7/2 +
8 0.8299 3/2 +
9 0.8450 7/2 +
10 1.0470 3/2 +
11 1.0504 7/2 +
12 1.1117 5/2 +
13 1.2100 1/2 +
14 1.2608 5/2 +
15 1.2821 3/2 +
16 1.2922 1/2 +
17 1.4016 9/2 +
18 1.4835 1/2 +
Levels above 1.55 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/17/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (5.13e-03) was adjusted to
reproduce the capture cross section of 215 milli-barns at 100
keV measured by Macklin./5/
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 (= 221.7) was estimated by the
formula derived from Kikuchi-Kawai's formalism/18/ 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) 1500.00 mb (systematics of Wen Den Lu+/19/)
(n,p) 3.64 mb (systematics of Forrest/20/)
(n,alpha) 1.86 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 from 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-125 1.700E+01 5.120E-01 7.883E-01 3.792E+00 1.090E+00
51-SB-126 1.700E+01 5.250E-01 7.566E+00 2.897E+00 0.0
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
52-TE-126 1.706E+01 6.100E-01 5.154E-01 6.554E+00 2.230E+00
52-TE-127 2.004E+01 5.380E-01 3.633E+00 5.165E+00 1.140E+00
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
53-I -127 1.717E+01 6.263E-01 4.458E+00 5.757E+00 1.090E+00
53-I -128 1.715E+01 6.200E-01 2.329E+01 4.542E+00 0.0
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
---------------------------------------------------------------
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 5.277 for I -129 and 5.0 for I -130.
References
1) Aoki, T. et al.: Proc. Int. Conf. on Nuclear Data for Basic
and Applied Science, Santa Fe., Vol. 2, p.1627 (1985).
2) Kawai, M. et al.: Proc. Int. Conf. on Nuclear Data for Science
and Technology, Mito, p. 569 (1988).
3) Noguere G. et al.: Phys. Rev., C74, 054602 (2006).
4) Nakamura S. et al.: J. Nucl. Sci. Technol., 33, 283 (1996).
5) Macklin, R.L.: Nucl. Sci. Eng., 85, 350 (1983).
6) Igarasi, S.: J. Nucl. Sci. Technol., 12, 67 (1975).
7) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).
8) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77
(1983).
9) Perey, F.G: Phys. Rev. 131, 745 (1963).
10) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).
11) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).
12) 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).
13) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446
(1965).
14) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).
15) Gruppelaar, H.: ECN-13 (1977).
16) Matsumoto, J., et al.: JAERI-M 7734 (1978).
17) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
18) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
19) Wen Den Lu and Fink, R.W.: Phys. Rev., C4, 1173 (1971).
20) Forrest, R.A.: AERE-R 12419 (1986).