32-GE- 70 KHI EVAL-MAR94 T.WATANABE
DIST-MAR02 REV2-JUL01 20010713
----JENDL-3.3 MATERIAL 3225
-----INCIDENT NEUTRON DATA
------ENDF-6 FORMAT
HISTORY
94-3 Newly evaluated
01-07 Compiled by K.Shibata for JENDL-3.3
********* modified parts for JENDL-3.3 *******************
(1,451) Updated.
(3,251) Deleted.
(4,2) Transformation matrix deleted.
(5,16-91) INT=22
************************************************************
mf=1 General information
mt=451 Comments and dictionary
mf=2 Resonance parameters
mt=151 Resolved resonance parameters
Resolved resonance parameters for MLBW formula (below 15 keV)
Negative energy level parameters were adjusted to reproduce
Koesters 2200m/s data/1/.
Parameters were evaluated mainly based on Mughabghabs
compilation/2/.
calculated 2200-m/s cross sections and res. integrals (barns)
2200 m/s res. integ.
total 15.43 -
elastic 12.5 -
capture 2.93 2.51
mf=3 Neutron cross sections
Below 15 keV, resonance parameters were given.
Above 15 keV, the total, elastic and inelastic scattering, and
capture cross sections were calculated with the optical and
statistical model code casthy/3/.
Optical model parameters used in casthy calculation were as
follows.
depth (MeV) radius(fm) diffuseness(fm)
---------------------- ------------ ---------------
V = 52.07-0.7434E , r0 = 5.0445 , a0 = 0.492
Ws = 9.997+0.1299E , rs = 5.8151 , as = 0.36
Vso= 10.99 , rso= 6.0583 , aso= 0.65
The level scheme was adopted from ENSDF file/4/.
no. energy(MeV) spin-parity beta 2/3
gr. 0.0000 0 +
1 1.0392 2 + 0.16
2 1.2154 0 +
3 1.7079 2 + 0.12
4 2.1534 4 +
5 2.1574 2 + 0.12
6 2.3069 0 +
7 2.4515 3 +
8 2.5358 2 +
9 2.5614 3 - 0.11
10 2.8067 4 +
11 2.8877 0 +
12 2.9452 2 + 0.11
13 3.0468 3 +
14 3.0588 4 +
15 3.1070 0 +
16 3.1810 2 +
17 3.1942 4 +
18 3.2420 1 +
19 3.2966 3 +
20 3.2973 6 +
21 3.3718 3 +
22 3.4165 5 -
23 3.4230 2 + 0.11
24 4.0000 2 + 0.11(dummy)
Levels above 3.43 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.
Ge- 70 Ge- 71
-------- --------
a (1/MeV) 13.430 13.600
spin cut-off param. 9.088 9.232
pairing energy (MeV) 2.860 1.360
normalization factor 1780.00 1828.30
e-joint (MeV) 8.234 8.064
The capture cross section was adjusted to 45 millibarns at
200 keV/5/.
Above 1MeV, direct/semidirect capture cross section normalized
to 0.77mb at 14MeV, were added to casthy's results/6/.
mt=16,22,28,103,104,105,106,107,111
(n,2n),(n,na),(n,np),(n,p),(n,d),(n,t),(n,He-3),
(n,a),(n,2p)
were evaluated with modified egnash-2/7/ using f2=1.2 and
following optical potential
neutron :same as used in casthy
proton :Perey's omp/8/
deutron :Lohr-Haeberli's omp/9/
triton :Becchetti-Greenless omp/10/
he-3 :Becchetti-greenless omp/10/
alpha :Lemos omp/11/
and normalized to the following data.
(n,2n) 500.0 mb Konno's exp. data/12/
(n,np) 48.0 mb systematics/13/
(n,p) 96.0 mb av. of /14/,/15/ and /16/
(n,d) 7.9 mb systematics
(n,a) 30.0 mb systematics
mf=4 Angular distributions of secondary neutrons
mt=2,16,22,28,51-74,91
Elastic and inelastic scattering cross section,(n,2n),(n,na)
and (n,np)
Angular distributions were calculated with casthy for ela-
stically and inelastically scattered neutrons. The direct
inelastic scattering contribution were evaluated with
dwucky programm/17/. Deformation parameters used in dwucky
calcualtion were evaluated from compilations/18,19/ and
ensdf half life data and adjusted to reproduce
ddx data/20/.
As for (n,2n),(n,na),(n,np) and (n,nd),isotropic distribution
was assumed.
mf=5 Energy distributions of secondary neutrons
mt=16,22,28,91
For (n,2n),(n,na),(n,np) and continum inelstic scattering
secondary neutron energy distribution was calculated with
egnash-2.
References
1)L. Koester et. al. Z.Phys. A327,129(1987)
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)Evaluated Nuclear Structural Data File
5)G. Walters KfK-3706(1984)
6)T. Nakagawa capdir manual
7)N. Yamamuro JAERI-M 90-006(1991)
8)F.G. Perey PR 131, 745(1963)
9)J.M. Lohr, W. Haeberli NP A232, 381(1974)
10)F.D. Becchetti and Polarization Phenomena in Nuclear
G.W. Greenless Reaction 682(1971) Univ. Wisconsin
11)O.F. Lemos Orsay Rep.Ser.A No.136(1972)
12)C. Konno et.al. JAERI-1329(1993)
13)R.A. Forrest AERE-R 12419(1986)
14)H.M. Hoang et al ZP.A342,283(1992)
15)J.L. Casanova et al. ARS,72,(3),186(1976)
16)G.P. Vinitskaya et al. NESTOR list
17)N. Yamamuro JAERI-M 88-140(1988)
18)S. Raman et al. AND 42,1(1989)
19)R.H. Spear AND 42,55(1989)
20)A. Takahashi et.al. Oktavian data private com.