[en] Big Ge-arrays like Euroball or Gasp have been built with the main purpose of studying high angular momentum phenomena in nuclei. When coupled with powerful ancillary detectors they became also excellent instruments to explore the properties of very exotic nuclei far from Beta-stability. A large fraction of the experiments has been therefore devoted to study both proton-rich and neutron rich nuclei populated using stable beams provided by the Legnaro and Strasbourg accelerators. In the talk the main emphasis will be on nuclei lying close to the N=Z line where fundamental properties of the nuclear force can be tested with high precision. New results on 66 As, 67 Se and 70 Br will be reported. (author)

No abstract available

[en] Nuclear structure studies far from stability rely mainly on the availability of radioactive nuclear beams but can complementary be addressed by means of high intensity beams of stable ions. In such contest, deep-inelastic and multinucleon transfer reactions are a powerful tool to populate yrast and non yrast states in neutron-rich nuclei. Particularly successful is here the combination of large acceptance spectrometers with highly segmented gamma-detector arrays. Such devices can provide the necessary channel selectivity to identify very rare signals. The AGATA gamma-ray detector array coupled to the PRISMA spectrometer at the Legnaro National Laboratories (LNL) in Italy is one example. Large data sets have been collected at LNL for nuclei close to the N=20, 28, 40, 50 and 82 shell closures

[en] Super deformed structures have been investigated in the A∼130 and A∼150 mass regions with the new 4-π γ-spectrometer GASP. The decay out of superdeformed bands has been studies for the ¹³³Nd and ¹⁴⁸Gd nuclei. In the case of the ¹³³Nd nucleus we could firmly establish excitation energies, spins and parity for the states of the superdeformed band. Very promising results for the ¹⁴⁸Gd nucleus re also presented. Moreover we could identify in the ¹³⁴Nd nucleus, the first example of an excited superdeformed band in the A∼130 mass region. (author)

[en] High spin states of the proton rich nuclei in the mass region A ≅100 have been studied at the GASP and recently at the EUROBALL γ-ray spectrometers. Of the several nuclei populated in the reactions the authors will discuss here the high spin states of ¹⁰⁵In, ¹⁰⁵Sn and ¹⁰⁹Te as examples for magnetic rotation and octupole collectivity. For ¹⁰⁵In and ¹⁰⁵Sn regular sequences of dipole transitions have been found. The states of the dipole bands are suggested to be built on neutron h_11/2 excitations coupled to proton hole states, which polarize the core to a slightly prolate shape. The experimental results are in agreement with the prediction of tilted axis cranking calculations. For the ¹⁰⁹Te nucleus has been identified two bands of opposite parity connected by strong dipole transitions of E1 character. Octupole correlations induced by rotation are suggested as the cause of this effect

[en] High spin states of the proton rich nuclei in the mass region A ∼ 100 have been studied at the GASP spectrometer through the evaporation of light charged particles and heavier ions detected in the 4π Si-ball Isis. Rear side injection and pulse shape analysis have allowed a good discrimination among protons, alpha particles and heavy ions up to C. Of the several nuclei populated in the reactions we will discuss here the high spin states of ¹⁰⁵ Sn. In addition to an extension of the spherical level, scheme, a regular sequence of dipole transitions has been found, The states of the dipole band are suggested to be built on a neutron h²_11/2 excitation coupled to proton particle-hole states, which polarize the core to a slightly prolate shape. The experimental results are in agreement with the prediction of tilted axis cranking calculations, which satisfactorily explain the properties of the band. (author)

[en] Isospin mixing phenomena and mirror symmetry have been investigated in the mass A ∼ 50 - 70 region, using the GASP and EUROBALL γ-detector arrays. The measure of the electric dipole strength of an isospin forbidden transition in ⁶⁴Ge has allowed a direct determination of the isospin mixing amplitude. The excited structures of the T_z = 0 ⁷⁰Br and T_z = -1/2 ⁶⁷Se nuclei have been identified for the first time. Detailed information has also been obtained for the N = Z = 33 ⁶⁶As. (orig.)

[en] This report is divided into two parts. In the first part, the qualification of samples arising from the cementation of low (LLW) and intermediate level ( MLW) radioactive wastes is studied. In particular, bead ion exchange resins, filter sludges, BWR evaporator concentrates and decontamination solutions have been taken into account. The properties of the final waste forms have been compared with the ones of laboratory scale samples. The qualification of the solidified wastes was performed according to the requirements of the Italian Regulatory Body. Particular attention is devoted to mechanical and thermal properties, biodegradability and behaviour versus water. In the second part, the influence of different parameters on the leaching of Cesium from cemented BWR evaporator concentrates (sulfates) is tested. In particular the influence of the variation of temperature, initial concentration of the tracer, renewal and chemical composition of the leachant, size of the sample, has been tested. 20 refs., 68 figs., 21 tabs

[en] The evolution of nuclear properties as a function of the neutron excess depends on how the shell structure changes. This evolution has consequences on the ground state properties and on the single-particle and collective excitations. Presently, our knowledge about the structure of nuclei is mostly limited to nuclei close to the valley of stability or nuclei with a deficiency of neutrons. Only recently the availability of beams of unstable ions has given access to unexplored regions of the nuclear chart, especially on the neutron-rich side. A complementary way to study the structure of neutron-rich nuclear systems is offered by the use of high intensity beams of stable ions and binary reactions. Multi-nucleon and deep-inelastic reactions are a powerful tool to populate medium- and high-spin states in moderately neutron-rich systems. In this article, I will discuss some selected examples studied using the novel experimental setup that combines the large acceptance magnetic spectrometer, PRISMA, and the high-efficiency γ - ray detection arrays, CLARA and AGATA. They show the high potential of such reaction mechanism for the study of the spectroscopic properties of neutron-rich nuclear systems. (author)

[en] To understand the properties of a nucleus, apart from establishing the interaction between its components, it is necessary to determine the arrangement of the nucleon, i.e. the structure of a nucleus. Presently our knowledge about the structure of nuclei is mostly limited to nuclei close to the valley of stability or nuclei with a deficiency of neutrons. Only recently the availability of beams of unstable ions has given access to unexplored regions of the nuclear chart, especially on the neutron rich side. An alternative and often complementary way to study the structure of neutron rich nuclear systems is offered by the use of high intensity beams of stable ions. Binary reactions with stable bems are a powerful tool to populate medium and high spin states in neutron rich nuclei. In this article I will discuss some selected examples which show the high potential of such reaction mechanism for the study of the spectroscopic properties of the neutron-rich nuclear many body systems.