82-Pb-204
82-PB-204 JAERI EVAL-JUL87 M.MIZUMOTO
DIST-MAR02 REV3-SEP01 20010907
----JENDL-3.3 MATERIAL 8225
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 Newly evaluated for JENDL-3 by M. Mizumoto (jaeri)
87-11 Revise is recommended.
89-09 Revision is completed.
Compilation was made by T. Narita and T.Fukahori (jaeri)
94-04 JENDL-3.2.
By adopting the data from JENDL fusion file
gamma-ray production data modified by K.Shibata(jaeri)
Compiled by T.Nakagawa (ndc/jaeri)
***** modified parts for JENDL-3.2 ********************
(3,2), (3,4), (3,16). (3,17), (3,22), (3,28), (3,51-91)
(4,16-91), (5,16-91)
These data were taken from JENDL fusion file.
(12,102) From energy balance
(15,102) Spectrum at 1.0e-5 eV
***********************************************************
01-06 JENDL-3.3
Compiled by K.Shibata
***** modified parts for JENDL-3.3 ********************
(1,451) Updated.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(4,16-91) Deleted.
(5,16-91) Deleted.
(6,16-91) Taken from JENDL fusion file.
***********************************************************
-------------------------------------------------------------
JENDL fusion file /1/ (as of Oct. 1993)
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 and angular
distributions of inelastically scattered neutrons (except
continuum inelastic) were calculated with casthy2y and
dwucky in sincros-ii system/2/ including contributions
from direct reactions.
- The (n,2n), (n,3n), (n,na) and (n,np) reaction cross
sections (mt=16, 17, 22, 28) were calculated by egnash2
in the sincros-ii. The (n,2n) cross section was
renormalized to experimental data.
- Energy distributions of secondary neutrons were replaced
with 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/.
-------------------------------------------------------------
mf=1 General information
mt=451 Descriptive data and dictionary
mf=2 Resonance parameters
mt=151 Resolved resonance parameters for MLBW formula
Resonance ranges: 1.0e-5 eV to 50 keV
Parameters were evaluated from the data of Horen+84 /5/.
Effective scattering radius of 8.5 fm was selected.
calculated 2200-m/s cross sections and res. integrals.
2200 m/s res. integ.
elastic 11.197 b -
capture 0.661 b 1.848 b
total 11.857 b -
mf=3 Neutron cross sections
Below 50 keV
Background cross sections are given for the elastic scattering
and capture cross sections.
Above 50 keV
Cross sections for JENDL-3.1 were obtained from optical and
statistical model calculations. The optical potential parame-
ters were obtained by fitting average total cross section of
natural lead:
V=47.0 - 0.250*E, Ws = 2.30 + 0.41*E, Vso = 6.0 (MeV)
r0 = 1.25 , rs = 1.30 , rso = 1.30 (fm)
a0 = 0.65 , b=0.48 , as0 = 0.689 (fm)
Level density parameters were determined using low-lying level
data and observed neutron resonance spacing.
For JENDL-3.2, the (n,2n), (n,3n), (n,na), (n,np) and inelastic
scattering cross sections were adopted from JENDL fusion file.
They were calculated with sincros-ii system/2/ by adopting
Walter-Guss omp modified by Yamamuro/2/ for neutron, Perey omp
/6/ for proton, Lemos omp modified by Arthur and Young/7/ for
alpha, Lohr-Haeberli omp/8/ for deuteron, Becchettii-Greenlees
omp/9/ for triton and he-3, and standard level density
parameters of sincros-ii system.
The data of total, capture, (n,p), (n,d) and (n,a) cross
sections are the same as JENDL-3.1.
mt=1 Total
Calculated with optical and statistical mode code casthy /10/
mt=2 Elastic scattering
(total)-(all other partial cross sections)
mt=4,51-61,91 Inelastic scattering
The cross sections were taken from JENDL fusion file. The level
scheme was adoptted from ref./4/ contributions of the direct
process were calculated for the levels marked with '*', using
deformation parameters compiled by Raman et al./11/ and
Spear/12/.
no. energy(MeV) spin-parity (direct process)
g.s. 0.0 0.0 +
1 0.8992 2.0 + *
2 1.2739 4.0 + *
3 1.3514 2.0 + *
4 1.5631 4.0 + *
5 1.5836 0.0 +
6 1.6047 3.0 +
7 1.665 2.0 + *
8 1.682 1.0 +
9 1.73 0.0 +
10 1.7619 1.0 -
11 1.8173 4.0 + *
Levels above 1.817 MeV were assumed to be continuum.
mt=16, 17, 22, 28 (n,2n), (n,3n), (n,na), (n,np)
Adopted from JENDL fusion file. Theoretical calculation was
made with sincros-ii. The (n,2n) cross section was normalized
to 2.12 b at 13.98 mev measured by Ikeda et al./13/,
mt=102 Capture
Calculated with casthy /10/.
mt=103, 107 (n,p), (n,a)
Calculated with gnash /14/.
mt=203 Total proton production
Sum of mt=28 and 103.
mt=207 Total alpha production
Sum of mt=22 and 107.
mf=4 Angular distributions of secondary neutrons
mt=2
Calculated with casthy /10/.
mt=51-61
Taken from JENDL fusion file. Calculated with the casthy and
dwucky in the sincros-ii system.
mf=6 Energy-angle distributions of secondary particles
mt=16, 17, 22, 28, 91, 203, 207
Taken from JENDL fusion file.
mf=12 Gamma-ray multiplicity produced by neutron reactions
mt=16,17,22,91
Calculated with gnash /14/.
mt=51-61
Transition probabilities were given.
mt=102
From energy balance.
mf=14 Angular distributions of secondary gamma-rays
mt=16,17,51-61,22,91,102: assumed to be isotropic.
mf=15 Energy distribution of secondary gamma-rays
mt=16,17,91,102: calculated with the gnash /14/.
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) Horen, D.J. et al. : Phys. Rev. C29, 2126 (1984).
6) Perey, F.G.: Phys. Rev., 131, 745 (1963).
7) Arthur, E.d. and Young, P.G.: LA-8626-MS (1980).
8) Lohr, J.M. and Haeberli, W.: Nucl. Phys., A232, 381 (1974).
9) Becchetti, F.D. Jr. and Greenlees, G.W.: "Polarization
Phenomena in Nucl. Reactions," Univ. Wisconsin Press, p.682
(1971).
10) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991).
11) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1
(1987)
12) Spear, R.H.: Atom. Data and Nucl. Data Table, 42, 55 (1989).
13) Ikeda, Y. et al.: JAERI 1312 (1987).
14) Young, P.G. and Arthur, E.D.: LA-6974 (1977).