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• W2847708889 abstract "The structure of nuclei with few nucleons outside the double-shell closure Z=N =50 has attracted large theoretical and experimental interest in the last years. Several studies were performed in this region to examine the evolution of the nucleon-nucleon interaction when going towards 100Sn and eventually deduce the proton shell closure. Along the whole isotopic chain the excitation energy of the first 2+ and 4+ states is well known and the behaviour is rather constant. Then, for neutron-rich Sn isotopes the reduced transition probability seems to follow the parabolic behavior with the maximum at the mid shell, which is the typical trend that one would expect for one-body even operator, such as the B(E2). However, the information on the B(E2; 2+→0+) values for the neutron-deficient Sn isotopes suffer from large experimental uncertainties. Moreover there is a lack of information on the B(E2; 4+→2+), while their values would help to make a more robust physical interpretation. Since now theoretical calculations have been performed during the last decades, but up to date none of them is able to reproduce consistently the trend of the experimental reduced transition probabilities for the full Sn isotopic chain.The experiment discussed in this thesis was devoted to the measurement of the lifetimes of the low-lying states 2+ and 4+ for 106,108Sn, in order to derive the reduced transition probabilities B(E2), by using the Recoil Distance Doppler-Shift (RDDS) method. The nuclei of interest were populated via multinucleon transfer reaction where a 106Cd beam, provided by one separated-sector cyclotron of the GANIL facility (France) at the energy of 770 MeV, impinged onto a 92Mo target. After the target a 24Mg foil was used as degrader for slowing down the reaction products. This measurement is complementary to the Coulomb excitation method and it represents the very first direct lifetime measurement in the neutron-deficient Sn isotopes.The complete identification of the reaction products was obtained on an event-by-event basis using the VAMOS++ magnetic spectrometer. In coincidence with VAMOS++, gamma rays were detected by 8 AGATA Triple Clusters. Thanks to the combination of the magnetic spectrometer together with the choice of the reaction mechanism, it was also possible to reconstruct the Q-value of the reaction. Such information was crucial for the success of the lifetime measurement because it allowed to control the feeding from higher-lying states.Finally it was possible to measure the lifetimes of the 2+ and 4+ excited states for 106,108 Sn. In order to reduce the error, for 108Sn several tests on both Decay-Curve Method (DCM) and Differential Decay-Curve Method (DDCM) are discussed.The reduced transition probabilities B(E2), deduced from the measured lifetimes, were compared with Large-Scale Shell-Model (LSSM) calculations. Such basic nuclear feature have proved to be incredibly sensible to the form of the wave function: in particular the new B(E2; 4+→2+) value of 108Sn clearly showed that high seniority components of the wave function are of extreme importance to define the transition probabilities in this region. Thisresult questions the validity of other theoretical predictions, which have been considering the seniority truncation, in reproducing consistently the trend of the experimental B(E2) values." @default.
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• W2847708889 date "2017-12-31" @default.
• W2847708889 modified "2023-09-26" @default.
• W2847708889 title "Nuclear structure of the semi-magic tin isotopes close to 100Sn: lifetime measurements of low-lying states in 106Sn and 108Sn" @default.
• W2847708889 hasPublicationYear "2017" @default.
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