1 - IAEA Nuclear Data Services

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XVIII o GRUPPO DI RICERCA DEL CONTRATTO EURATOM-CNEN-INFN - ISTITUTO DI
FÍSICA DELL 1 UNIVERSITA', PADOVA (ITALY)
1. Elastic and inelastic scattering of fast neutrons from Ho
(U. Fasoli, P.P. Sambo, D. Toniolo, G. Zago)
A measurement has been performed of angular distribution of ela­
stic and inelastic scattering from Ho at the following ener­
gies: 3.0, 4.3, 6,0, 7.5 MeV, using the time-of-flight technique.
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The nuclear temperature of Ho and the level density deduced
from the neutron inelastic scattering are in good agreement with
the statistical model previsions. The analysis of the elastic
scattering is beeing carried out using an optical model which
considers also the nuclear deformation.
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2. Elastic and inelastic scattering of fast neutrons from Na
(U. Fasoli, P.P. Sambo, D. Toniolo, G. Zago)
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The elastic and inelastic cross sections of each level of Na
have been measured using the time-of-flight technique at the
energies 1.5» 2.5, 4.0, 6.5 MeV. A complete analysis of the da­
ta with the optical model is underway.
3. Total cross section of neutrons on Mg, Cl, K in the energy inter­
val 5.0*8.5 MeV
(U. Fasoli, P.P. Sambo, D. Toniolo, G. Zago)
The total cross section of neutrons on Mg, Cl, K has been measured
in the energy interval 5.0*8.5 MeV, with steps of 25 KeV, energy
resolution of about 30 KeV and a statistical error of 1+2%. The
Mg cross section shows strong fluctuations, CI and K cross section
fluctuations are less pronounced.
The Mg cross section has been partially remeasured both with high­
er (about 10 KeV) and smaller (about 200 KeV) energy resolution
to study the dependence of the fluctuations amplitude from the
averaging interval.
An analysis of the fluctuations is in progress also from the point
of view of the "intermediate structures".