20-Ca- 44
20-CA- 44 DEC EVAL-MAR87 M.HATCHYA(DATA ENG. CO.)
DIST-MAR02 REV3-MAY01 20010521
----JENDL-3.3 MATERIAL 2037
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
87-03 New evaluation was made to give a full revision for JENDL-2
data.
87-03 Compiled by T.Asami(nedac)
93-11 JENDL-3.2
Data were mainly adopted from JENDL fusion file.
Compiled by T.Nakagawa
***** modified parts for JENDL-3.2 ********************
(3,1), (3,2), (3,4), (3,16), (n,3n), (3,22), (3,28),
(3,51-91)
all angular distributions except for (4,2).
all energy distributions.
***********************************************************
-------------------------------------------------------------
JENDL fusion file /1/ (as of Nov. 1993)
Evaluated by K.Kosako (nedac) and S.Chiba (ndc/jaeri)
Compiled by K.Kosako.
- 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.
- 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.
- The resonance parameters, total, capture, (n,p) and (n,a)
cross sections and ang. Distributions of elastically
scattered neutrons were taken from JENDL-3.1.
- 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/.
-------------------------------------------------------------
2001-05 JENDL-3.3
Gamma-ray production date were evaluated and compiled by
K.Shibata (jaeri/ndc).
******** modified parts for JENDL-3.3 ******************
(1,451) Updated.
(3,203), (3,207) Calculated.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(4,16-91) Deleted.
(5,16-91) Deleted.
(6,16-207) Taken form JENDL fusion file.
(12,16-107) Evaluated.
(14,16-107) Evaluated.
(15,16-107) Evaluated.
**********************************************************
mf=1 General information
mt=451 Descriptive data and dictionary
mf=2 Resonance parameters
mt=151 Resolved resonance parameters
Resolved parameters for MLBW formula were given in the energy
region from 1.0e-5 eV to 500 keV. Parameters were taken from
the recommended data of bnl/5/ and the data for a negative
resonance were added so as to reproduce the recommended thermal
cross sections for capture and scattering/5/. The scattering
radius was assumed to be 3.6 fermi. Calculated 2200 m/sec
cross sections and resonance integrals are as follows:
2200 m/s cross section(b) res. integral(b)
elastic 3.320
capture 0.888 0.4254
total 4.208
mf=3 Neutron cross sections
Below 500 keV, zero background cross section was given and all
the cross-section data are reproduced from the evaluated
resolved resonance parameters with MLBW formula.
For JENDL-3.2, all cross-section data except for the total,
capture, (n,p) and (n,a) cross sections were adopted from JENDL
fusion file. The calculation was made 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.
mt=1 Total
Optical and statistical model calculation was made with the
casthy code/10/. the optical potential parameters used are:
V = 49.68, Vso = 7.12 (MeV)
Ws = 7.76 - 0.5*En, Wv = 0 (MeV)
r = 1.17, rs = 1.09, rso = 1.17 (fm)
a = 0.6, aso = 0.6, b = 0.69 (fm)
mt=2 Elastic scattering
Obtained by subtracting the sum of the partial cross sections
from the total cross section.
mt=4, 51-59, 91 Inelastic scattering
The cross sections were taken from JENDL fusion file. The
level scheme was based on ref./4/ Contributions of the direct
process were calculated for the levels marked with '*' by means
of dwucky. Deformation parameters were adopted from Raman et
al./11/ and Spear/12/.
no. energy(MeV) spin-parity (direct process)
0.0 0 +
1 1.157 2 + *
2 1.8835 0 +
3 2.2831 4 + *
4 2.6565 2 + *
5 3.0443 4 + *
6 3.2849 5 +
7 3.3013 2 +
8 3.3079 3 - *
9 3.3572 2 +
Levels above 3.357 MeV were assumed to be overlapping.
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,np) cross section was normalized
to the experimental data of Ikeda et al./13/
mt=102 Capture
Calculated with the casthy code/10/ and normalized to 7.1 mb
at 45 keV/14/.
mt=103, 107 (n,p), (n,a)
Calculated with the gnash code/15/ using the same optical model
parameters as the total cross section.
mf=4 Angular distributions of secondary neutrons
mt=2
Calculated with the casthy code/10/.
mt=51-58
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
Based on kumabe's systematics/3/.
mt=203, 207
Based on kalbach's 1988 systematics/16/.
mf=12 Photon production multiplicities
mt=16, 22, 28, 51-59, 91, 103, 107
Calculated with the egnash code/2/.
mt=102
Calculated with the casthy code/10/.
mf=14 Photon angular distributions
mt=16, 22, 28, 51-59, 91, 102, 103, 107
Assumed to be isotropic in the laboratory system.
mf=15 Continuous photon energy spectra
mt=16, 22, 28, 91, 103, 107
Calculated with the egnash code/2/.
mt=102
Calculated with the casthy code /10/.
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) Mughabghab S.F., et al. :"Neutron Cross Sections",
Vol. 1, Part A (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 (1988).
14) Musgrove A.R.DE L. et al.: Nucl. Phys., A279, 317 (1977).
15) Young, P.G. and Arthur, E.D. : LA-6947 (1977).
16) Kalbach, C. : Phys. Rev. C37, 2350(1988).