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Above barrier narrow resonances in fluorine-15

Abstract : The study of unbound nuclei beyond the drip-lines allows us to test our understand- ing of the atomic nucleus under extreme conditions. In this thesis, we have analyzed two separate GANIL experiments in which fluorine 15, located two proton beyond the proton drip-line, was studied. One of the interesting particularity of this nucleus is the presence of particularly narrow negative parity states, above the Coulomb and centrifugal barriers. In this work, we were interested in theses states. We have confirmed the existence of the second excited state 1/2- and have observed two new states, a 5/2- state and a 3/2- state by measuring their decay by emitting either one or two protons. The structure of these states has been discussed and we have tried to explain the origin of the asymmetry observed between the 3/2- state of fluorine 15 and its analogue state in carbon 15. We have also detailed the possibility of gamma transitions between unbound states.
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Submitted on : Monday, November 23, 2020 - 11:34:22 AM
Last modification on : Tuesday, November 24, 2020 - 5:39:11 AM
Long-term archiving on: : Wednesday, February 24, 2021 - 6:54:19 PM


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  • HAL Id : tel-03019149, version 1



Valerian Girard-Alcindor. Above barrier narrow resonances in fluorine-15. Physics [physics]. Normandie Université, 2020. English. ⟨NNT : 2020NORMC209⟩. ⟨tel-03019149⟩



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