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Etude des réactions induites par le noyau à halo $^{11}$Li avec la cible active MAYA.

Abstract : Active targets are perfect tools for the study of nuclear reactions induced by very low intensity radioactive ion beams. They also enable the simultaneous study of direct and compoud nuclear reactions. The active target MAYA, built at GANIL, has been to study the reactions induced by a 4.3A MeV 11Li beam at the ISAC2 accelerator TRIUMF (Canada). The angular distributions for the elastic scattering and the one and two neutron transfer reaction have been reconstructed. The elastic scattering angular distribution indicates a strong enhancement of the flux absorption with respect to the neighbouring nuclei. From a coupled channel analysis of the two neutron transfer reaction for different three body models, the informations on the structure of the halo of the borromean nucleus 11Li have been extracted. Meanwhile, the energy dependence of the elastic scattering reaction has been studied, using the active target MAYA as a thick target. The resulting spectrum shows a resonance around 3 MeV centre of mass. This resonance could be an isobaric analog state of 12Li, observed in 12Be. R matrix calculations have been performed in order to extract the parameters (spin and parity) of this state.
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https://tel.archives-ouvertes.fr/tel-00424010
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Submitted on : Tuesday, October 13, 2009 - 4:46:40 PM
Last modification on : Thursday, February 1, 2018 - 1:35:55 AM
Long-term archiving on: : Tuesday, June 15, 2010 - 9:53:56 PM

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Thomas Roger. Etude des réactions induites par le noyau à halo $^{11}$Li avec la cible active MAYA.. Physique Nucléaire Expérimentale [nucl-ex]. Université de Caen, 2009. Français. ⟨tel-00424010⟩

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