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Premiers états du $^{15}$F étudiés par diffusion élastique résonante

Abstract : This thesis describes the study of a light neutron deficient nucleus located beyond the proton drip-line : 15F. This unbound nucleus was studied using the resonant elastic scattering reaction : 14O(p,14O)p, performed in inverse kinematics. The radioactive ions beam produced by the GANIL SPIRAL facility, impinged a thick polypropylene target. Excitation function was measured up to 5.6 MeV in the center of mass and three resonances were observed. The ground and first excited state of 15F are observed as broad resonances corresponding to very short living states. The third resonance is due to a state with a spin and parity 1/2− which is observed for the first time. It is located 4.78 MeV above the proton emission threshold. Surprisingly, this resonance is very narrow, corresponding to a long living state. This state lies 160 keV above the two-proton threshold, which makes it a candidate for 2-proton emission. Several decay channels were discussed for this state, including a proton-gamma decay via the tail of first excited state resonance in 14O. Results are discussed in terms of nuclear structure and the existence of two-proton of proton-gamma decay.
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Submitted on : Tuesday, January 19, 2010 - 4:19:15 PM
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F. de Grancey. Premiers états du $^{15}$F étudiés par diffusion élastique résonante. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 2009. Français. ⟨tel-00448658⟩

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