17-CL- 37 KHI EVAL-MAR94 T.WATANABE
DIST-MAR02 REV2-FEB02 20020208
----JENDL-3.3 MATERIAL 1731
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
94-3 Newly evaluated
00-11 JENDL-3.3
***** 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(below 202.0keV)
mt=151 resolved resonance parameters
Resolved resonance parameters for MLBW formula with varing scat-
ering radius. Negative energy level data were adjusted to
reproduce 2200m/s cross sections.
Evaluation was mainly based on Macklin's/1/ data and
Mughabghab's/2/ compilation.
calculated 2200-m/s cross sections and res. integrals (barns)
2200 m/s res. integ.
total 1.583 -
elastic 1.15 -
capture 0.433 0.204
mf=3 Neutron cross sections
Below 202 keV, resonance parameters were given.
Above 202 keV, the total, elastic and inelastic scattering, and
capture cross sections were calculated with the optical and
statistical model code casthy/3/.
Direct/semidirect cross section normalized to 0.286mb at
14 MeV were corrected to casthy's results/4/.
Optical model parameters used in casthy calculation were as
follows.
depth (MeV) radius(fm) diffuseness(fm)
---------------------- ------------ ---------------
V = 46.68-0.3459E , r0 = 4.8317 , a0 = 0.308
Ws = 3.584+1.224E , rs = 4.7751 , as = 0.338
Vso= 6.2 , rso= 3.9987 , aso= 0.638
The level scheme was adopted from ENSDF file/5/.
no. energy(MeV) spin-parity beta2/beta3
gr. 0.0 3/2 +
1 1.7266 1/2 + 0.2
2 3.0866 5/2 + 0.2
3 3.1033 7/2 - 0.25
4 3.6260 3/2 + 0.15
5 3.7078 3/2 + 0.15
6 3.7409 5/2 - 0.25
7 4.0099 9/2 - 0.2
8 4.0163 3/2 + 0.15
9 4.1766 3/2 - 0.2
10 4.2689 1/2 + 0.15
11 4.2726 7/2 - 0.2
12 4.3963 5/2 + 0.1
13 4.4600 7/2 -
14 4.5460 11/2 -
15 4.7700 13/2 +
16 4.8012 5/2 +
17 4.8109 7/2 +
18 4.8376 5/2 +
19 4.8540 1/2 -
20 4.9042 7/2 +
21 4.9210 9/2 -
22 4.9230 13/2 +
23 4.9608 3/2 +
24 4.9740 13/2 +
25 5.0093 5/2 +
26 5.0552 5/2 +
27 5.0591 3/2 -
Levels above 5.06 MeV 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- 37 Cl- 38
-------- --------
a (1/MeV) 5.564 6.299
spin cut-off param. 3.824 4.142
pairing energy (MeV) 2.040 0.0
normalization factor 389.80 453.22
e-joint (MeV) 7.099 3.313
The capture cross section was adjusted to dovbenkos data/6/.
mt=16,22,28,32,33,103,104,105,106,107
(n,2n),(n,na),(n,np),(n,nd),(n,nt),(n,p),(n,d),(n,t),
(n,he-3),(n,a)
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 :Pperey-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,na) 3.93 mb systematics/13/
(n,p) 22.3 mb Kawade's data/14/
(n,d) 8.18 mb systematics
(n,t) 0.84 mb systematics
(n,a) 31.5 mb av. exp. data/15,16,17/
mf=4 Angular distributions of secondary neutrons
mt=2,16,22,28,32,51-77,91
Elastic and inelastic scattering cross section,(n,2n),(n,na),
(n,np) and (n,nd)
Angular distributions were calculated with casthy for ela-
stically and inelastically scattered neutrons.
Direct inelastic contribution were calculated with dwucky/18/.
Deformation parameters used in dwucky calculation were
evaluated from compilations/19,20/ and ENSDF half life data.
As for (n,2n),(n,na),(n,np) and (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 egansh-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)S.Igarasi,T.Fukahori JAERI-1321 (1991)
4)T.Nakagawa CAPDIR manual
5)Evaluated Nuclear Structural Data File
6)A.G. Dovbenko et al. AE 23,151(1967)
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)R.A.Forrest AERE-R 12419(1986)
14)K.Kawade et al. JAERI-M 90-171(1990)
15)R.Prasad NP 85,476(1966)
16)I.N.Ngoc Ngoc
17)R.S.Scalan et al. NP 9,334(1958)
18)N.Yamamuro JAERI-M 88-140(1988)
19)S.Raman et.al. AND 42,1(1989)
20)R.H.Spear AND 42,55(1989)