31-Ga- 69 KHI EVAL-MAR94 T.WATANABE
DIST-MAY10 20091112
----JENDL-4.0 MATERIAL 3125
-----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) Modified.
*****************************************************************
09-09 The unresolved resonance parameters were obtained for
JENDL-4.0. The data were compiled by K.Shibata (jaea).
mf=1 General information
mt=451 Comments and dictionary
mf=2 Resonance parameters
mt=151 Resolved and unresolved resonance parameters
Resolved resonance region (MLBW formula): below 5.9keV
Negative energy level parameters were adjusted to reproduce
Koester's data/1/. Evaluation were mainly based on Ohkubo's
data/2/ and Mughabghab's compilation/3/.
Unresolved resonance region: 5.9 keV - 1 MeV
The parameters were obtained by fitting to the evaluated
total and capture cross sections. The unresolved resonance
parameters should be used only for self-shielding
calculation.
Thermal cross sections and resonance integrals at 300 K
----------------------------------------------------------
0.0253 eV res. integ. (*)
(barns) (barns)
----------------------------------------------------------
Total 1.0424E+01
Elastic 8.2231E+00
n,gamma 2.2011E+00 1.8219E+01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
mf=3 Neutron cross sections
Below 5.9 keV, resonance parameters were given.
Above 5.9 keV, the total, elastic and inelastic scattering, and
capture cross sections were calculated with the optical and
statistical model code casthy/4/.
Optical model parameters used in casthy calculation were as
follows.
depth (MeV) radius(fm) diffuseness(fm)
---------------------- ------------ ---------------
V = 49.42-0.5867E , r0 = 5.3033 , a0 = 0.415
Ws = 5.381+0.4117E , rs = 5.3648 , as = 0.456
Vso= 8.552 , rso= 6.4928 , aso= 0.648
The level scheme was adopted from ENSDF file/5/.
no. energy(MeV) spin-parity beta2/beta3
gr. 0.0000 3/2 -
1 0.3187 1/2 - 0.2
2 0.5741 5/2 - 0.2
3 0.8720 3/2 - 0.2
4 1.0285 1/2 - 0.2
5 1.1068 5/2 - 0.15
6 1.1340 7/2 - 0.15
7 1.3366 7/2 - 0.15
8 1.4880 7/2 - 0.15
9 1.5259 3/2 - 0.15
10 1.7237 5/2 - 0.15
11 1.7648 9/2 -
12 1.8916 3/2 -
13 1.9242 7/2 -
14 1.9724 9/2 +
15 1.9731 1/2 -
16 2.0076 3/2 -
17 2.0238 5/2 -
18 2.0452 5/2 -
19 2.1980 13/2 -
20 2.2193 1/2 +
21 2.2510 1/2 -
22 2.3195 7/2 +
23 2.3533 5/2 -
24 2.4233 13/2 -
25 2.4287 5/2 -
Levels above 2.43 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.
Ga- 69 Ga- 70
-------- --------
a (1/MeV) 11.340 11.590
spin cut-off param. 8.271 8.442
pairing energy (MeV) 1.500 0.0
normalization factor 1481.60 1536.20
E-joint (MeV) 6.924 4.221
The capture cross section was normalized to 60 millibarns at
100keV to reproduce Dovbenko's data/6/.
Above 1 MeV, direct/semidirect capture cross section normalized
to 0.77mb at 14 MeV were aded to casthy's results/7/.
mt=16,22,28,32,33,103,104,105,106,107,111
(n,2n),(n,na),(n,np),(n,nd),(n,nt),(n,p).(n,d),(n,t),
(n,he-3),(n,a),(n,2p)
were evaluated with modified egnash-2/8/ using f2=0.6 and
following optical potential
neutron :same as used in casthy
proton :Perey's omp/9/
deutron :Lohr-Haeberli's omp/10/
triton :Becchetti-Greenlees' omp/11/
he-3 :Becchetti-Greenlees' omp
alpha :Lemos omp/12/
and normalized to following data.
(n,2n) 886.0 mb Chatterjee's data/13/
(n,na) 2.2 mb systematics/14/
(n,np) 17.3 mb systematics
(n,p) 38.0 mb Qaims data/15,16/
(n,d) 6.87 mb systematics
(n,t) 0.55 mb systematics
(n,a) 22.0 mb av. exp. data/17/
mf=4 Angular distributions of secondary neutrons
mt=2,16,22,28,32,51-75,91
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.
Diect inelastic contributions were evaluated with dwucky/18/,
and added to casthy's results.
Deformation parameters used in the dwucky calculation were
evaluated from compilation/19,20/ and ENDSF half life data.
as for (n,2n),(n,na),(n,np) and (n,nd),isotropic distribution
was 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 scatter-
ing, secondary neutron energy distributions were calculated with
egnash-2.
****************************************************************
For JENDL-3.3, distributions at threshold were modified.
****************************************************************
References
1)L.Koester et. al. Z.Phys. A318,347(1984)
2)M.Ohkubo et. al. JAERI-M 90-213(1990)
3)S.F.Mughabghab et. al., Neutron Cross Section Vol.1 Part A
Academic Press(1981)
4)S.Igarasi,T.Fukahori JAERI-1321 (1991)
5)Evaluated Nuclear Structural Data File
6)A.G. Dovbenko et al. AE 26,67(1969)
7)T,Nakagawa CAPDIR manual
8)N.Yamamuro JAERI-M 90-006(1991)
9)F.G.Perey Phys. Rev. 131, 745(1963)
10)J.M.Lohr,W.Haeberli Nucl. Phys. A232, 381(1974)
11)F.D.Becchetti and Polarization Phenomena in Nuclear
G.W.Greenlees Reaction 682(1971) Univ. Wisconsin
12)O.F.Lemos Orsay Rep.Ser.A No.136(1972)
13)A.Chatterjee et al. 69 Rookee 2,117(1969)
14)R.A.Forrest AERE-R 12419(1986)
15)S.M.Qaim et al Nucl. Phys. A283,269(1977)
16)G.P. Vinitskaya et al. Vinitskaya (1969) acc.no.=40009008
17)K.Kawade et al JAERI-M 92-020(1992)
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)