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Detecting bubbles in exotic nuclei

Abstract : The occurrence of a bubble, due to an inversion of s$_{1/2}$ state with the state usually located above, is investigated. Proton bubbles in neutron-rich Argon isotopes are optimal candidates, and the case of $^{46}$Ar is analyzed. Several experimental data favor the bubble hypothesis, such as the B(E2) value of the first 2$^+$ state, the energy level of the first 3$^-$ state as well as the ground state properties of $^{47}$K. Pairing effects which can play against the bubble formation are evaluated. They cannot prevent bubble formation in more neutron-rich argon isotopes such as $^{68}$Ar. This pleads for a measurement of the charge density of $^{46}$Ar in the forthcoming years, with the advent of electron scattering experiments in next generation exotic beam facilities such as FAIR or RIBF.
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Submitted on : Tuesday, July 17, 2007 - 2:47:20 PM
Last modification on : Sunday, November 8, 2020 - 12:26:02 PM

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E. Khan, M. Grasso, J. Margueron, N. van Giai. Detecting bubbles in exotic nuclei. Nuclear Physics A, Elsevier, 2008, 800, pp.37-46. ⟨10.1016/j.nuclphysa.2007.11.012⟩. ⟨in2p3-00163331⟩

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