Etude de la radioactivité de $^{22}$Al et spectroscopie par diffusion élastique résonante

Abstract : This thesis describes two studies which explore the structure of proton-rich nuclei.
The first of these concerned an investigation of the Β-delayed charged particle decay of 22Al. The experiment was carried out using the LISE3 spectrometer at GANIL and permitted the energies of the Β-p, Β-2p and Β-Α transitions together with the corresponding branching ratios to be determined with an improved precision over earlier work. In addition the coincidences with Γ-rays were measured for the first time allowing the decay scheme to be reconstructed. Comparison with shell model calculations using the code OXBASH and the mirror nucleus 22F allowed the spin and parity and the mass of 22Al g.s. as well as levels in 22Mg to be deduced. The experimentally determined Gamow-Teller strength was found to be in good agreement at low excitation energies with a shell model calculation employing an effective operator.
The second study concerned the development of resonant elastic scattering in inverse kinematics as a spectroscopic tool. Extensive simulations were carried out to ascertain the feasibility of such experiments as well as to optimise the set-up. In the context of the later, particular attention was paid to the final resolution. Experiments subsequently undertaken at GANIL with stable and radioactive beams demonstrated that the technique will be a powerful spectroscopic tool for use with radioactive beams with characteristics similar to those that will be furnished by SPIRAL.
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N.L. Achouri. Etude de la radioactivité de $^{22}$Al et spectroscopie par diffusion élastique résonante. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2001. Français. ⟨tel-00168474⟩

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