17-CL- 35 KHI EVAL-MAR94 T.WATANABE
DIST-MAR02 REV2-FEB02 20020208
----JENDL-3.3 MATERIAL 1725
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
94-3 Newly evaluated
00-10 JENDL-3.3
Compiled by K.Shibata (jaeri)
***** Modified parts for JENDL-3.3 *************************
(1,451) Updated.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(5,16-91) Distributions at threshold were modified.
************************************************************
mf=1 General information
mt=451 Comments and dictionary
mf=2 Resonance parameters
mt=151 resolved resonance parameters(below 226keV)
Resolved resonance parameters for MLBW formula.
Negative energy level parameters were adjusted to reproduce
2200m/s cross sections.
Evaluation was mainly based on Macklin's/1/ data and
Mughabghab's/2/ compilation.
Below 226keV,(n,p) and (n,a) cross sections were given as
background total cross section.
calculated 2200-m/s cross sections and res. integrals (barns)
2200 m/s res. integ.
total 64.2 -
elastic 20.6 -
capture 43.6 17.8
mf=3 Neutron cross sections
Below 226 keV, resonance parameters were given.
Above 226 keV, the total, elastic and inelastic scattering, and
capture cross sections were calculated with the optical and
statistical model code casthy/4/.
Above 1.0MeV, direct/semidirect capture normalized to 0.349mb at
14MeV were added to casthys results/5/.
Optical model parameters used in casthy calculation were shown
as follows.
depth (MeV) radius(fm) diffuseness(fm)
---------------------- ------------ ---------------
V = 46.68-0.3459E , r0 = 4.743 , a0 = 0.308
Wi =-0.0007E**2 , ri = 0.0 , ai = 0.0
Ws = 3.584+1.224E , rs = 4.6874 , as = 0.338
Vso= 6.2 , rso= 3.9253 , aso= 0.638
The level scheme was adopted from ENSDF file/6/.
no. energy(MeV) spin-parity beta2/beta3
gr. 0.0 3/2 +
1 1.2193 1/2 + 0.28
2 1.7632 5/2 + 0.15
3 2.6453 7/2 + 0.2
4 2.6936 3/2 + 0.25
5 3.0026 5/2 + 0.2
6 3.1626 7/2 - 0.25
7 3.9185 3/2 + 0.2
8 3.9432 9/2 + 0.2
9 3.9675 1/2 + 0.15
10 4.0592 3/2 - 0.25
11 4.1133 7/2 + 0.15
12 4.1734 5/2 - 0.2
13 4.1779 3/2 - 0.2
14 4.3473 9/2 -
15 4.6242 3/2 +
16 4.7679 7/2 -
17 4.8406 1/2 +
18 4.8544 1/2 +
19 4.8817 7/2 +
20 5.0104 1/2 -
Levels above 5.02MeV were assumed to be overlapping.
Parameters for the composite level density formula of Gilbert-
Cameron were evaluated.
Spin cut-off parameter c1 was taken as 0.146.
Cl- 35 Cl- 36
-------- --------
a (1/MeV) 5.205 5.434
spin cut-off param. 3.564 3.711
pairing energy (MeV) 1.860 0.0
normalization factor 344.94 370.41
e-joint (MeV) 7.542 3.561
The capture cross section was normalized to 3 millibarns at
100 keV.
mt=16,22,28,32,103,104,105,106,107,111
(n,2n),(n,na),(n,np),(n,nd),(n,p),(n,d),(n,t),(n,he-3),
(n,a),(n,2p)
These cross sections were evaluated with modified egnash-2/7/
using f2=0.5 and following optical potential
neutron :same as used in casthy
proton :Perey's omp/8/
deutron :Perey-Perey's omp/9/
triton :Ragaini's omp/10/
he-3 :Luetzeshwab's omp/11/
alpha :Bock's omp/12/
and normalized to following data.
(n,2n) 9.6 mb av. exp. data/13,14/
(n,p) 125.0 mb av. exp. data/16,17/
(n,d) 12.6 mb systematics/15/
(n,a) 117.0 mb av. exp. data/18/
Below 58.607keV, (n,p) cross section was calculated using
koehlers resonance parameters/3/. Energy dependence of low
energy (n,a) cross section was assumed as 1/v and normalized
to 0.08mb at 2200 m/s./2/
mf=4 Angular distributions of secondary neutrons
mt=2,16,22,28,32,51-70,91
Elastic and inelastic scattering cross section,(n,2n),(n,na),
(n,np),(n,nd)
Angular distributions were calculated with casthy for ela-
stically and inelastically scattered neutrons. The direct
inelastic scattering contribution was evaluated with dwucky/19/.
deformation parameters used in dwucky calculation were evaluted
from compilaiton/20,21/, and ENSDF half life data.
As for (n,2n),(n,na),(n,np),(n,nd) isotropic distributions were
assumed.
mf=5 Energy distributions of secondary neutrons
mt=16,22,28,32,91
For (n,2n),(n,na),(n,np),(n,nd) and continum inelastic
scattering cross sections, secondary neutron energy distribution
were calculated with egnash-2.
References
1)R.L.Macklin et. at., PR C29,1996(1984)
2)S.F.Mughabghab et. al., Neutron Cross Section Vol.1 Part A
Academic Press(1981)
3)P.E.Koehler PR/C44,1675(1991)
4)S.Igarasi,T.Fukahori JAERI-1321 (1991)
5)T.Nakagawa CAPDIR manual
6)Evaluated Nuclear Structural Data File
7)N.Yamamuro JAERI-M 90-006(1991)
8)F.G.Perey PR 131, 745(1963)
9)C.M.Perey,F.G.Perey PR 132, 752(1963)
10)R.C.Ragaini et. al. PR C2,1020(1970)
11)J.W.Luetzelscfwab et.al PR 180,1023(1964)
12)R.Bock et. al. NP A92, 539(1967)
13)Y.Ikeda et al. JAERI-1312(1988)
14)G.Peto AHP,24,93(1968)
15)R.A.Forrest AERE-R 12419(1986)
16)D.L.Allan NP 24,274(1961)
17)W.Scantl Scantl
18)W.Nagel Nagel
19)N.Yamamuro JAERI-M 88-140(1988)
20)S.Raman et.al. AND 42,1(1989)
21)R.H.Spear AND 42,55(1989)