20-Ca- 46
20-CA- 46 MITSUI E.S.EVAL-APR80 M.HATCHYA
DIST-MAR02 REV3-MAY01 20010521
----JENDL-3.3 MATERIAL 2043
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
80-04 New evaluation was made by M.Hatchya (mitsui).
83-11 Ang. dist. was modified.
84-02 Comment was added.
88-10 Unchanged from JENDL-2.
93-11 JENDL-3.2
Data were mainly adopted from JENDL fusion file.
Compiled by T.Nakagawa
***** modified parts for JENDL-3.2 ********************
(3,2), (3,4), (3,16), (3,17), (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 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 No resonance parameters
2200-m/sec cross sections and calculated resonance integrals
2200-m/sec res.integ.
elastic 2.900 b -
capture 0.7400 b 0.339 b
total 3.640 b -
mf=3 Neutron cross sections
Thermal region was assumed below 1.0 keV. The capture and
elastic scattering cross sections were assumed to be 0.74 barns
/5/ and 2.9 barns at 0.0253 eV, respectively. The total cross
section was calculated as a sum of these two.
For JENDL-3.2, above 1 keV, 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 cross section
The optical model calculation with casthy /10/ was adopted.
optical potential parameters were taken from ref./11/.
V = 46.72 (MeV),
Ws = 9.13 (MeV),
Vso= 5.37 (MeV),
r0 = rso = 1.26 (fm),
rs = 1.39 (fm),
a = aso= 0.76 (fm),
b = 0.40 (fm).
mt=2 Elastic scattering cross section
Derived by subtracting partial cross sections from the total
cross section.
mt=4,51-53,91 Inelastic scattering cross sections
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./12/ and Spear/13/.
no. energy(MeV) spin-parity (direct process)
0.0 0 +
1 1.346 2 + *
2 2.4231 0 +
3 2.5747 4 +
4 2.9739 6 +
5 3.0226 2 +
6 3.6140 3 - *
7 3.6389 2 +
8 3.8597 4 +
Levels above 3.86 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.
mt=102 Capture cross section
Calculated with casthy /10/.
mt=103,107 (n,p) and (n,alpha) cross sections
Statistical and pre-equilibrium model calculations using the
optical potential parameters for the total cross section.
mf=4 Angular distributions of secondary neutrons
mt=2
Optical model calculation
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/14/.
mf=12 Photon production multiplicities
mt=16, 22, 28, 51-58, 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
(1981).
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) Fu, C.Y.: Atomic Data and Nuclear Data Table 17, 127 (1976).
12) Raman, S., et al.: Atom. Data and Nucl. Data Tables 36, 1
(1987)
13) Spear, R.H.: Atom. Data and Nucl. Data Table, 42, 55 (1989).
14) Kalbach, C. : Phys. Rev. C37, 2350(1988).