Pairing effects in 232Th neutron-induced fission cross section
The fission cross section of 232Th ( n , F ) is calculated consistently with the 232Th ( n , 2 n ) reaction cross section up to 20 MeV. The fission probability of the 232Th nuclide, fissioning in 232Th ( n , nf ) reaction is shown to be compatible with the surrogate 230Th ( t , pf ) fission probabil...
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| Published in | Nuclear physics. A Vol. 743; no. 4; pp. 236 - 255 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.11.2004
|
| Subjects | |
| Online Access | Get full text |
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| Summary: | The fission cross section of
232Th
(
n
,
F
)
is calculated consistently with the
232Th
(
n
,
2
n
)
reaction cross section up to 20 MeV. The fission probability of the
232Th nuclide, fissioning in
232Th
(
n
,
nf
)
reaction is shown to be compatible with the surrogate
230Th
(
t
,
pf
)
fission probability data. The
232Th
(
n
,
nf
)
reaction contribution to the observed
232Th
(
n
,
F
)
cross section up to
E
n
∼
9
MeV
is defined by the collective levels of the
232Th at saddle deformations, lying within the pairing gap. The importance of the negative parity octupole
K
π
=
0
−
band levels at saddle deformations is demonstrated. The shoulder or small step-like structure in the observed fission cross section of the
232Th
(
n
,
F
)
above
E
n
∼
9
MeV
is correlated with the excitation of the two-quasiparticle states at saddle deformations of the fissioning
232Th nuclide. Influence of the multiple-chance fission on the
232Th prompt fission neutron spectra is demonstrated. |
|---|---|
| ISSN: | 0375-9474 |
| DOI: | 10.1016/j.nuclphysa.2004.08.007 |