176
J. L. Ullmann et al.
Cross section (barns)
1
−
10
1
(a)
)
γ
U(n,
234
ENDF/B_VII.1
3
CoH
Cross section (barns)
1
−
10
1
)
γ
U(n,
236
ENDF/B_VII.1
3
CoH
Baramsai
(b)
Energy (eV)
4
10
5
10
Cross section (barns)
1
−
10
1
)
γ
U(n,
238
Ullmann
with SM
3
CoH
No SM
3
CoH
ENDFB/VII-1
(c)
Fig. 2 Uranium capture cross sections compared to calculations
giant dipole with parameters from ref. [12]. The level densities were the Gilbert–
Cameron form with updated parameters [13].
Figure 2 shows the cross sections calculated with CoH 3 compared to measurements. The calculations used the GLO form of the E1 photon strength function
with parameters described above. The MGLO form was not available in CoH 3 . M1
scissors mode, M1 “spin-flip,” and E2 contributions were included, with parameters
as described above. The data for 238 U is from ref. [9], and was normalized to lowlying resonances. The data for 236 U is from ref. [14] and was normalized with
experimentally determined efficiencies. There is no data for 234 U in the EXFOR
database, and the 234 U calculation is compared to the ENDF/B-VII.1 evaluation.
A recent measurement of 234 U(n, γ )made at DANCE is being analyzed. Note the
calculations are absolute and not renormalized to the data; very good agreement in
magnitude and shape was obtained.
J. L. Ullmann et al.
Cross section (barns)
1
−
10
1
(a)
)
γ
U(n,
234
ENDF/B_VII.1
3
CoH
Cross section (barns)
1
−
10
1
)
γ
U(n,
236
ENDF/B_VII.1
3
CoH
Baramsai
(b)
Energy (eV)
4
10
5
10
Cross section (barns)
1
−
10
1
)
γ
U(n,
238
Ullmann
with SM
3
CoH
No SM
3
CoH
ENDFB/VII-1
(c)
Fig. 2 Uranium capture cross sections compared to calculations
giant dipole with parameters from ref. [12]. The level densities were the Gilbert–
Cameron form with updated parameters [13].
Figure 2 shows the cross sections calculated with CoH 3 compared to measurements. The calculations used the GLO form of the E1 photon strength function
with parameters described above. The MGLO form was not available in CoH 3 . M1
scissors mode, M1 “spin-flip,” and E2 contributions were included, with parameters
as described above. The data for 238 U is from ref. [9], and was normalized to lowlying resonances. The data for 236 U is from ref. [14] and was normalized with
experimentally determined efficiencies. There is no data for 234 U in the EXFOR
database, and the 234 U calculation is compared to the ENDF/B-VII.1 evaluation.
A recent measurement of 234 U(n, γ )made at DANCE is being analyzed. Note the
calculations are absolute and not renormalized to the data; very good agreement in
magnitude and shape was obtained.