31-Ga- 71 KHI EVAL-MAR94 T.WATANABE
DIST-MAY10 20091112
----JENDL-4.0 MATERIAL 3131
-----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 uresolved resonance parameters
Resolved resonance region (MLBW formula): below 5.6 keV
Negative energy level parameters were adjusted to reproduce
Koesters 2200m/s data/1/.
Resonance parameterd were evaluatred mainly based on
Ohkubo's data/2/ and Mughabghabs compilation/3/.
Unresolved resonance region: 5.6 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 8.9844E+00
Elastic 5.2743E+00
n,gamma 3.7101E+00 3.2177E+01
----------------------------------------------------------
(*) Integrated from 0.5 eV to 10 MeV.
mf=3 Neutron cross sections
Below 5.6 keV, resonance parameters were given.
Above 5.6 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 calcualtion were as
follows.
depth (MeV) radius(fm) diffuseness(fm)
---------------------- ------------ ---------------
V = 49.42-0.5867E , r0 = 5.3541 , a0 = 0.415
Ws = 5.381+0.4117E , rs = 5.4162 , as = 0.456
Vso= 8.552 , rso= 6.5549 , aso= 0.648
The level scheme was adopted from ENSDF file/5/.
no. energy(MeV) spin-parity beta2/beta3
gr. 0.0 3/2 -
1 0.3900 1/2 - 0.2
2 0.4872 5/2 - 0.2
3 0.5116 3/2 - 0.2
4 0.7140 11/2 -
5 0.9103 3/2 - 0.2
6 0.9648 5/2 - 0.15
7 1.1074 7/2 - 0.15
8 1.1093 1/2 - 0.15
9 1.3952 7/2 - 0.15
10 1.4759 5/2 - 0.1
11 1.4937 9/2 + 0.1
12 1.4986 5/2 -
13 1.6316 3/2 -
14 1.7022 1/2 +
15 1.7198 5/2 -
16 1.7524 3/2 -
17 1.9040 5/2 -
18 1.9410 3/2 +
19 1.9950 5/2 -
20 2.0640 1/2 -
21 2.1324 5/2 -
22 2.1913 5/2 -
23 2.2060 5/2 -
24 2.2472 7/2 +
25 2.2944 1/2 -
26 2.3273 1/2 -
Levels above 2.33 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- 71 Ga- 72
-------- --------
a (1/MeV) 13.000 12.900
spin cut-off param. 9.026 9.075
pairing energy (MeV) 1.430 0.0
normalization factor 1747.70 1758.60
E-joint (MeV) 6.326 4.961
The capture cross section was normalized to 12 mb at 1MeV to
reproduce the experimental capture cross section/6/.
Above 1 MeV, direct/semidirect capture cross section normalized
to 0.74mb were added to casthy's results/7/.
mt=16,17,22,28,32,103,104,105,106,107
(n,2n),(n,3n),(n,na),(n,np),(n,nd),(n,nt),(n,p),(n,d),
(n,t),(n,he-3),(n,a)
were evaluated with modified egnash-2/8/ 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/11/
alpha :Lemos omp/12/
and normalized to following data.
(n,2n) 950.0 mb Csikai's data/13/
(n,na) 2.4 mb Qaims data/14/
(n,np) 1.95 mb systematics/15/
(n,p) 20.5 mb Qaims data/16/
(n,d) 3.63 mb systematics
(n,t) 0.33 mb systematics
(n,a) 3.5 mb measured data/17,18/
mf=4 mt=2,16,17,22,28,32,51-76,91
(n,2n),(n,na),(n,np),(n,nd) and elastic and inelastic scattering
angular distributions of secondary neutrons
Angular distributions were calculated with casthy for ela-
stically and inelastically scattered neutrons.
Direct inelastic scattering contributions were evaluated with
dwucky/19/ and added to casthy's results.
Deformation parameters used in the dwucky calculation was
evaluated from compilation/20,21/ and ENSDF half life data.
As for (n,2n),(n,3n),(n,na),(n,np) and (n,nd),isotropic
distributions were assumed.
mf=5 Energy distributions of secondary neutrons
mt=16,17,22,28,32,91
For (n,2n),(n,3n),(n,na),(n,np),(n,nd) and continum inelastic
scattering, 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)G.G.Zaikin et al. UFZ 16,1205(1971)
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.Greenless Reaction 682(1971) Univ. Wisconsin
12)O.F.Lemos Orsay Rep.Ser.A No.136(1972)
13)J.Csikai et al. AHP 23,87(1967)
14)S.M.Qaim et al. EUR-5182e,939'1974)
15)R.A.Forrest AERE-R 12419(1986)
16)S.M.Qaim et al Nucl. Phys. A283,269(1977)
17)K.Kawade et.al. JAERI-M 90-171(1990)
18)S.M.Qaim 14 MeV Activation Cross Sections
Handbook of Spectroscopy,Vol.3 p.141
CRC Press BOCA Raton Florida,1981
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)