International Reactor Dosimetry File 2002 - IAEA Publications

(i)
(ii)
(iii)
(iv)
(v)
Only diagonal covariance matrices are available for the cross-sections of
the following reactions: 23 Na(n,γ) 24 Na, 93 Nb(n,γ) 94 Nb, 115 In(n,γ) 116 In m ,
181 Ta(n,γ) 182 Ta and 232 Th(n,γ) 233 Th below 15 eV. New evaluations with
complete covariance information are required.
Covariance information for the cross-sections of the 197 Au(n,γ) 198 Au and
235 U(n,f) reactions are not reliable (corresponding data have been
withdrawn from ENDF/B-VI); updating is required.
The resonance integral has a large deviation from the recommended
experimental values for the following reactions: 55 Mn(n,γ) 56 Mn,
58 Fe(n,γ) 59 Fe and 93 Nb(n,γ) 94 Nb. A revision of the resonance parameters
in the corresponding evaluations is necessary.
Deviations of C/E values from unity by more than 5% are observed for
the following reactions (in addition to those mentioned in (iii)):
24 Mg(n,p) 24 Na, 63 Cu(n,2n) 64 Cu, 103 Rh(n,n′) 103 Rh m , 127 I(n,2n) 126 I,
169 Tm(n,2n) 168 Tm, 199 Hg(n,n′) 199 Hg m and 232 Th(n,f). Although the
majority of these data can be interpreted by considering the related
uncertainty information, revisions are merited. The large deviation of the
C/E value from unity for the cross-section of the 103 Rh(n,n′) 103 Rh m
reaction is caused by a discrepancy in the experimental data for this
reaction in the spontaneous neutron field of 252 Cf; new measurements of
the cross-section of the 103 Rh(n,n′) 103 Rh m reaction in this neutron
spectrum are recommended [6.8].
No experimental cross-section values are available in the 252 Cf (standard)
spontaneous fission neutron field for the following fast neutron reactions:
23 Na(n,2n) 24 Na, 31 P(n,p) 31 Si, 46 Ti(n,2n) 45 Ti, 47 Ti(n,np) 46 Sc, 48 Ti(n,np) 47 Sc,
49 Ti(n,np) 48 Sc, 52 Cr(n,2n) 51 Cr, 54 Fe(n,2n) 53 Fe, 54 Fe(n,α) 51 Cr,
75 As(n,2n) 74 As, 89 Y(n,2n) 88 Y, 115 In(n,2n) 114 In, 141 Pr(n,2n) 140 Pr and
241 Am(n,f).
The most important problems listed above should be resolved before any
further comprehensive revision of the library is made.
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