1 - IAEA Nuclear Data Services

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made with visual techniques. It is however noticeable that
the 1 ^0(n,a) 1 3Q reaction at the same energy, studied with
counter techniques, gives, for the angular distributions, re­
sults quite in disagreement with ours. For the first levels
the angular distributions show, in fact, forward asymmetry.
The results will soon be published. The results on the
20 1 ^
Ne(n,2o) C reaction have been published in "Nuovo Cimento"
[5]-
Ericson's fluctuations
Following a first work where we analysed the method of the
maxima counting to determine the correlation width, we have
extended the research to include the effect of the finite
energy resolution. We have then calculated the bias introduced
by various types of experimental resolution (rectangular,
Gaussian, Lorentzian) and presented the coefficients to be
used in the different experimental situations to obtain r
by means of the maxima counting. We have also made a compa­
rison of the influence of the finite resolution on the various
methods to determine r . The results have been presented to
LUI S.I.F. Meeting and are in the press f?"].
Montecarlo calculations on the "Blocking" effects in single
crystals
It is known that the angular distribution emitted from a latti­
ce centre of a single crystal shows narrow minima in the direc­
tion of main crystal strings.
According to a suggestion by Tulinov, this "blocking" effect
of lattice strings could be exploited to measure the lifetime
of highly excited nuclear states produces in nuclear reactions.
In fact, the depth of minimum is expected to decrease with in­
creasing distance of the emission point from the lattice centre,
so that the average recoil distance could be deduced from the