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Nuclear Physics A 800 (2008) 37-46
Detecting bubbles in exotic nuclei
E. Khan1, M. Grasso2, 3, J. Margueron1, N. Van Giai1

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.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  DFA - Dipartimento di Fisica e Astronomia
3 :  INFN - Istituto Nazionali di Fisica Nucleare
Physique/Physique Nucléaire Expérimentale

Physique/Physique Nucléaire Théorique
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