32-GE- 76 KHI EVAL-MAR94 T.WATANABE
DIST-MAR02 REV2-JUL01 20010713
----JENDL-3.3 MATERIAL 3243
-----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 50.0 keV)
Negative energy level parameters were adjusted to reproduce
Koesters 2200 m/s data/1/.
Level parameters were evaluated mainly based on Mughabghab's
compilation/2/.
calculated 2200-m/s cross sections and res. integrals (barns)
2200 m/s res. integ.
total 7.86 -
elastic 7.71 -
capture 0.15 1.32
mf=3 Neutron cross sections
Below 50 keV, resonance parameters were given.
Above 50 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 = 5.1846 , a0 = 0.492
Ws = 9.997+0.1299E , rs = 5.9767 , as = 0.36
Vso= 10.99 , rso= 6.2267 , 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 0.5629 2 + 0.16
2 1.1084 2 + 0.12
3 1.4101 4 +
4 1.5395 3 +
5 1.9111 0 +
6 2.0199 4 +
7 2.2059 1 +
8 2.2842 3 - 0.11
9 2.4781 1 +
10 2.5036 2 + 0.11
11 2.5911 1 +
12 2.6545 4 +
13 2.6911 3 -
14 2.7340 4 +
15 2.7478 4 +
16 2.7688 2 +
17 2.8416 2 +
18 2.8977 0 +
19 2.9198 1 -
20 3.0087 1 +
21 3.0405 2 + 0.11
22 3.0530 1 +
23 3.5000 2 + 0.10(dummy)
24 4.0000 2 + 0.10(dummy)
Levels above 3.06 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.
Ge- 76 Ge- 77
-------- --------
a (1/MeV) 14.230 14.200
spin cut-off param. 9.882 9.871
pairing energy (MeV) 2.830 1.360
normalization factor 2047.70 2043.40
E-joint (MeV) 8.586 6.872
The capture cross section were normalized to 18 milli-
barns at 25 keV/5/.
Above 1 MeV, direct/semidirect capture cross section normalized
to 0.766mb at 14 MeV,were added to casthgy's result/6/.
mt=16,17,22,28,103,104,105,107
(n,2n),(n,3n),(n,na),(n,np),(n,p),(n,d),(n,t),(n,a)
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 following data.
(n,2n) 1130 mb exp. data /12,13,14,15/
(n,p) 2.9 mb exp. data /16/
(n,d) 1.7 mb systematics/17/
(n,a) 1.63 mb systematics
mf=4 Angular distributions of secondary neutrons
mt=2,16,17,22,28,51-74,91
Elastic and inelastic scattering cross section,(n,2n),(n,3n),
(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/18/. Deformation parameters used in dwucky
calcualtion were evaluated from compilations/19,20/ and
ensdf half life data and adjusted to reproduce ddx data/21/.
As for (n,2n),(n,3n),(n,na) and (n,np),isotropic distributions
were assumed.
mf=5 Energy distributions of secondary neutrons
mt=16,17,22,28,91
For (n,2n),(n,3n),(n,na).(n,np) and continum inelastic scatter-
ing, secondary neutron energy distributions were 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. Walter 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)S. Okumura et al. NP/A 93,74(1967)
13)E. Steiner et al. HPA 43,17(1969)
14)R. Vaenakae et al. NIM 179,525(1981)
15)I. Birn JUL-2803,37(1993)
16)R. Rieppo et al. JIN 38,1927(1976)
17)R.A. Forrest AERE-R 12419(1986)
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)
21)A. Takahashi et.al. Oktavian data private com.