53-I -127
53-I -127 JNDC EVAL-MAR90 JNDC FP NUCLEAR DATA W.G.
DIST-MAY10 20091112
----JENDL-4.0 MATERIAL 5325
-----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/.
93-09 JENDL-3.2 was made by JNDC FPND W.G.
***** modified parts for JENDL-3.2 ********************
(2,151) Upper boundary of resolved resonance region
was changed from 4.252 keV to 2 keV.
***********************************************************
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 5.2 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 -39.25 eV so as to reproduce the
the thermal capture cross section of 6.40+-0.29 b measured
by Katoh et al./4/
Unresolved resonance region : 5.2 keV - 100 keV
The parameters were determined to reproduce the total and
capture cross sections calculated with CASTHY /5/.
The parameters should be used only for self-shielding
calculation.The effective scattering
Thermal cross sections and resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 9.6571E+00
Elastic 3.2545E+00
n,gamma 6.4026E+00 1.5391E+02
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
mf = 3 Neutron cross sections
Below 5.2 keV, resonance parameters were given.
Above 5.2 keV, the spherical optical and statistical model
calculation was performed with CASTHY/5/, by taking account of
competing reactions, of which cross sections were calculated
with PEGASUS/6/ 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/7/.
The OMP's for charged particles are as follows:
proton = Perey/8/
alpha = Huizenga and Igo/9/
deuteron = Lohr and Haeberli/10/
helium-3 and triton = Becchetti and Greenlees/11/
Parameters for the composite level density formula of Gilbert
and Cameron/12/ were evaluated by Iijima et al./13/ 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
/14/.
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./15/
no. energy(MeV) spin-parity
gr. 0.0 5/2 +
1 0.0576 7/2 +
2 0.2028 3/2 +
3 0.3750 1/2 +
4 0.4179 5/2 +
5 0.6184 3/2 +
6 0.6286 7/2 +
7 0.6510 9/2 +
8 0.7165 11/2 +
9 0.7446 9/2 +
10 0.9910 3/2 +
Levels above 1.1 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/16/ and normalized to 1 milli-barn at 14 MeV.
The gamma-ray strength function (8.29e-03) was adjusted to
reproduce the capture cross section of 760 milli-barns at 25
keV measured by Yamamuro et al./17/
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 =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 (= 185.0) 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) 1800.00 mb (recommended by Bychkov+/19/)
(n,p) 16.00 mb (recommended by Forrest/20/)
(n,alpha) 1.50 mb (recommended by 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 SYST A(1/MEV) T(MEV) C(1/MEV) EX(MEV) PAIRING
---------------------------------------------------------------
51-SB-123 1.585E+01 6.213E-01 1.285E+00 5.469E+00 1.430E+00
51-SB-124 1.696E+01 5.600E-01 1.090E+01 3.433E+00 0.0
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
52-TE-124 1.784E+01 6.740E-01 1.452E+00 8.479E+00 2.570E+00
52-TE-125 1.992E+01 5.590E-01 5.035E+00 5.527E+00 1.140E+00
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
53-I -125 * 1.789E+01 5.895E-01 2.042E+00 5.696E+00 1.430E+00
53-I -126 * 1.763E+01 5.871E-01 1.981E+01 4.127E+00 0.0
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
---------------------------------------------------------------
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 7.0 for I -127 and 5.0 for I -128.
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.: J. Nucl. Sci. Technol., 29, 195 (1992).
3) Noguere G. et al.: Phys. Rev., C74, 054602 (2006).
4) Katoh T. et al.: J. Nucl. Sci. Technol., 36, 223 (1999).
5) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991).
6) Iijima, S. et al.: JAERI-M 87-025, p. 337 (1987).
7) Iijima, S. and Kawai, M.: J. Nucl. Sci. Technol., 20, 77
(1983).
8) Perey, F.G: Phys. Rev. 131, 745 (1963).
9) Huizenga, J.R. and Igo, G.: Nucl. Phys. 29, 462 (1962).
10) Lohr, J.M. and Haeberli, W.: Nucl. Phys. A232, 381 (1974).
11) 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).
12) Gilbert, A. and Cameron, A.G.W.: Can. J. Phys., 43, 1446
(1965).
13) Iijima, S., et al.: J. Nucl. Sci. Technol. 21, 10 (1984).
14) Gruppelaar, H.: ECN-13 (1977).
15) Matsumoto, J., et al.: JAERI-M 7734 (1978).
16) Benzi, V. and Reffo, G.: CCDN-NW/10 (1969).
17) Yamamuro, N., et al.: J. Nucl. Sci. Technol., 17, 582 (1980).
18) Kikuchi, K. and Kawai, M.: "Nuclear Matter and Nuclear
Reactions", North Holland (1968).
19) Bychkov, V.M. et al.: INDC(CCP)-146/LJ (1980).
20) Forrest, R.A.: AERE-R 12419 (1986).