82-Pb-208
82-PB-208 JAERI EVAL-JUL87 M.MIZUMOTO
DIST-MAR02 REV3-SEP01 20010907
----JENDL-3.3 MATERIAL 8237
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 Newly evaluated for JENDL-3 by M.Mizumoto (jaeri)
87-11 Revision is recommended.
89-09 Revision is completed.
Compilation is made by T.Narita and F.Fukahori (jaeri)
94-06 JENDL-3.2.
Resonance parameters corrected by T.Nakagawa
Data for mf=3,4,5 were adopted 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 ********************
(3,4), (3,16). (3,17), (3,22), (3,51-91)
(4,16-91), (5,16-91)
These data were taken from JENDL fusion file.
(2,151) Reich-Moore formula adopted, and upper boundary
of resonance region was changed from 0.8 to 1 MeV
(3,2)
(12,102), (15,102)
***********************************************************
01-07 JENDL-3.3
Compiled by K.Shibata
***** modified parts for JENDL-3.3 ********************
(1,451) Updated.
(3,1) Relaced with JENDL-3.2 elemental data above 1
MeV.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(4,16-91) Deleted.
(5,16-91) Deleted.
(6,16-91) Taken from JENDL fusion file.
(12,16),(12,91) Revised.
(15,16),(15,91) Revised.
***********************************************************
-------------------------------------------------------------
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 Reich-Moore formula
Resonance ranges: 1.0e-5 eV to 1.0 MeV
Parameters were adopted from Horen+86 /5/ and Mughabghab/6/.
Average radiative width of 0.18 eV was used for the resonances
whose value was unknown. Effective scattering radius of 9.69
fm/5/ was adopted. Background cross sections were given to
reproduce the low energy total cross section measured at Kyoto
University/7/ and the total cross section measured by Horen et
al./5/ in the 100-460 keV region.
calculated 2200-m/s cross sections and res. integrals.
2200 m/s res. integ.
elastic 11.471 b -
capture 0.5007 mb 6.755 mb
total 11.472 b
mf=3 neutron cross sections
Below 1 MeV
bckground cross sections are given to the total and elastic
scattering cross sections.
Above 1 MeV
cross sections of JENDL-3.1 were obtained with an optical and
statistical model calculation code casthy /8/. The optical
potential parameters were obtained by fitting average total
cross section of natural lead as follows,
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) 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
/9/ for proton, Lemos omp modified by Arthur and Young/10/
for alpha, Lohr-Haeberli omp/11/ for deuteron, Becchettii-
Greenlees omp/12/ for triton and he-3, and standard level
density parameters of sincros-ii system.
mt=1 Total
Calculated with casthy /8/.
******* JENDL-3.3 ******************************************
For JENDL-3.3, the total cross sections were replaced with the
experimental data measured by Schwartz et al./24/ between 1
and 15 MeV.
****************************************************************
mt=2 Elastic scattering
(total)-(all other partial cross sections)
mt=4,51-73,91 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 '*'.
no. energy(MeV) spin-parity (direct process)
g.s. 0.0 0 +
1 2.6146 3 - *
2 3.1977 5 - *
3 3.4751 4 -
4 3.7087 5 - *
5 3.9198 6 -
6 3.9464 4 -
7 3.9610 5 -
8 3.9957 5 -
9 4.0370 7 -
10 4.0450 5 -
11 4.0505 3 -
12 4.0854 2 + *
13 4.1060 3 -
14 4.1253 4 -
15 4.1410 2 +
16 4.1590 5 -
17 4.1804 5 -
18 4.2054 6 -
19 4.2295 2 -
20 4.2300 4 -
21 4.2535 3 -
22 4.2624 5 -
23 4.2960 5 - *
Levels above 4.296 MeV were assumed to be continuum. The direct
inelastic scattering cross sections were calculated for the
levels at 4.3237, 4.4235, 4.698, 4.973, 5.087, 5.242, 5.345,
5.483, 5.514, 5.542, 5.689, 5.813, 5.993, 6.688 and 7.019 MeV,
and added to mt=91.
mt=16, 17, 22 (n,2n), (n,3n), (n,na)
Adopted from JENDL fusion file. Theoretical calculation was
made with sincros-ii. The (n,2n) cross section was adjusted to
reproduce the measured enargy spectra/13/ (factor = 1.2). The
data of Simakov et al. /14/ were also taken into consideration.
mt=28 (n,n'p)
Calculated with gnash /15/ and normalized to 26 mb at 20 MeV
by Welch+81 /16/.
mt=102 Capture
Estimated from the experimental data by Csikai+67 /17/, Drake+71
/18/, Bergqvist+72 /19/, Diven+60 /20/ and Leipunskij+58 /21/.
mt=103 (n,p)
Calculated with gnash /15/ and normalized to 4 mb at 18 MeV by
Bass+68 /22/.
mt=107 (n,alpha)
Calculated with gnash /15/ and normalized to 1.6 mb at 14.5 MeV
by Coleman+59 /23/.
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 /8/.
mt=51-73
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=16,17,22,28,91,103,107
Calculated with gnash /15/.
Data of mt=16,91 were revised for JENDL-3.3.
mt=51-73
Transition probabilities are given.
m=102
From energy balance.
mf=14 Angular distributions of secondary gamma-rays
mt=16,17,22,28,51-73,91,102,103,107 : assumed isotropic.
mf=15 Energy distribution of secondary gamma-rays
mt=16,17,22,28,91,107
Calculated with the gnash /15/.
Data of mt=16,91 were revised for JENDL-3.3.
m=102
Calculated with casthy /8/.
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. C34, 420 (1986).
6) Mughabghab, S.F.: Neutron Cross Sections, vol.1, part B,
Academic Press (1984).
7) Shcherbakov, O. et al.: 1993 Fall Meeting of the Atomic Energy
Soc. Japan, p.139 (1993).
8) Igarasi, S. and Fukahori, T.: JAERI 1321 (1991).
9) Perey, F.G.: Phys. Rev., 131, 745 (1963).
10) Arthur, E.D. and Young, P.G.: LA-8626-MS (1980).
11) Lohr, J.M. and Haeberli, W.: Nucl. Phys., A232, 381 (1974).
12) Becchetti, F.D. Jr. and Greenlees, G.W.: "Polarization
Phenomena in Nucl. Reactions," Univ. Wisconsin Press, p.682
(1971).
13) Takahashi, A. et al.: JAERI-M 86-080, 393 (1986).
14) Simakov, S.P. et al: Workshop on Nucl. Data for Fusion Reactor
Technol., Del Mar, March 3-6 (1993).
15) Young, P.G and Arthur, E.D. : LA-6974 (1977).
16) Welch, P. et al. : BAP, 26, 708 (1981).
17) Csikai, J. et al.: Nucl. Phys. A95, 229 (1967).
18) Drake, D. et al.: Phys. Letters B36, 557 (1971).
19) Bergqvist, I. et al.: Nucl. Phys. A191, 641 (1972).
20) Diven, B.C. et al.: Phys. Rev. 120, 556 (1960).
21) Leipunskij, A.I. et al.: 58 Geneva, 15, 50 (1958).
22) Bass et al. : EANDC(E)-89,58 (1968).
23) Coleman, R.F. et al. :Proc. Roy. Soc. (London) 73 215 (1959).
24) Schwartz, R.B. et al.: NBS-MONO-138 (1974), data in EXFOR
(1971).