1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
- 123 -<br />
effect on the half-life of 55m U (T,, = 26min) has been undertaken.<br />
n<br />
Preliminary results indicate a very large effect, amounting to about<br />
6% between two extreme cases.<br />
6» Integral cross sections measurements and nuclear data re<br />
lated to reactors»<br />
6.1 . Evaluation of nuclear data for activation detectors.<br />
A. FABRY,P.P. DAMLE, D.LANGELA, H. VANDÏNBROECK<br />
The application of the spectral index technique in thermal and<br />
fast reactors requires an accurate description of differential<br />
energy cross section for activation detectors.<br />
Excellent papers have been published on nuclear data related<br />
to fissile and structural materials considered in reactor cal<br />
culations, but no counterpart seems to exist for activation de<br />
tectors, except in the case of threshold reactions. A systematic<br />
compilation and evaluation effort has therefore been undertaken<br />
to fulfill the requirement, in close connection with reactor<br />
physics programmes. The report Big 421 £ 1 J presents recommanda<br />
tions for the reactions : 1 Dy(n, v) 1é5g Dy, 151 Eu(n, v) 152m Eu,<br />
176 Lu(n, v ) 177 ^Lu, 191 lr(n,v) 192 eir, 193 Ir(n,v ) 19 ^Ir,<br />
115 ln(n,v) 1l6m ln, 197 Au(n, v ) 1 9 V 175 Lu(n, v ) 176m Lu and<br />
W(n,v ) W in view of their use in thermal reactors (éner<br />
gie below about j?0 eV).<br />
A further paper ¿ 2 J soon to be published gives both differen<br />
tial and multigroup recommended croes section sets for the reac-<br />
tions 115 ln(n,v ) 1l6 «Inf 197 Au(n,vV 98 Au, l86 W(n,v ) 18? W,<br />
159 La(„,v )^°La, 55 Mn(n, v ) 56 Mn, 198 Pt(n,v ) 1 "*Pt and 63 C„(n, V) 64 Cu<br />
over the whole neutron energy range 0,001 eV - 10 MeV for the<br />
application in fast reactor spectra.