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Etude de la fermeture de couches N=28 : implication astrophysique. Spectroscopie Béta Gamma de noyaux riches en neutrons

Abstract : The study of the N=28 shell closure has been presented as well as its astrophysical
implications. Moreover the structure of neutron rich nuclei around N=32/34 and 40 was
studied.
The N=28 shell closure has been studied trough the one neutron transfer reaction on
^{44,46}Ar nuclei. Excitation energies of states in ^{45,47}Ar nuclei have been obtained, as well
as their angular momenta and spectroscopic factors. These results were used to show
that N=28 is still a good magic number in the argon isotopic chain. We interpreted the
evolution of the spin-orbit partnair gaps in terms of the tensor monopolar proton-neutron
interaction. Thanks to this latter, we showed it is not necessary to summon up a reduction
of the intensity of the spin-orbit force in order to explain this evolution in N=29 isotopes
from calcium to argon chains.
The neutron capture rates on ^{44,46}Ar have been determined thanks to the results of the
transfer reaction. Their influence on the nucleosynthesis of ^{46,48}Ca was studied. We proposed
stellar conditions to account for the anormal isotopic ratio observed in the Allende
meteorite concerning ^{46,48}Ca isotopes.
Our results show that N=34 is not a magic number in the titanium chain and the superior ones


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Laurent Gaudefroy. Etude de la fermeture de couches N=28 : implication astrophysique. Spectroscopie Béta Gamma de noyaux riches en neutrons. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011747⟩

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