LEPAILLEUR, A.; SORLIN, O.; CACERES, L.; BASTIN, B.; BORCEA, C.; BORCEA, R.; BROWN, B.A.; GAUDEFROY, L.; GRÉVY, S.; GRINYER, G.F.; HAGEN, G.; HJORTH-JENSEN, M.; R. JANSEN, G.; LLIDOO, O.; NEGOITA, F.; DE OLIVEIRA SANTOS, Francois; PORQUET, M.-G.; ROTARU, F.; SAINT-LAURENT, M.G.; SOHLER, D.; STANOIU, M.; THOMAS, J.C.

doi:10.1103/PhysRevLett.110.082502

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LEPAILLEUR, A.
Grand Accélérateur National d'Ions Lourds [GANIL]

SORLIN, O.
Grand Accélérateur National d'Ions Lourds [GANIL]

CACERES, L.
Grand Accélérateur National d'Ions Lourds [GANIL]

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Physical Review Letters. 2013, vol. 110, p. 082502

American Physical Society

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A long-lived $J^{\pi}=4_1^+$ isomer, $T_{1/2}=2.2(1)$ms, has been discovered at 643.4(1)~keV in the weakly-bound $^{26}_{\;9}$F nucleus. It was populated at GANIL in the fragmentation of a $^{36}$S beam. It decays by an internal transition to the $J^{\pi}=1_1^+$ ground state (82(14)\%), by $\beta$-decay to $^{26}$Ne, or beta-delayed neutron emission to $^{25}$Ne. From the beta-decay studies of the $J^{\pi}=1_1^+$ and $J^{\pi}=4_1^+$ states, new excited states have been discovered in $^{25,26}$Ne. Gathering the measured binding energies of the $J^{\pi}=1_1^+-4_1^+$ multiplet in $^{26}_{\;9}$F, we find that the proton-neutron $\pi 0d_{5/2} \nu 0d_{3/2}$ effective force used in shell-model calculations should be reduced to properly account for the weak binding of $^{26}_{\;9}$F. Microscopic coupled cluster theory calculations using interactions derived from chiral effective field theory are in very good agreement with the energy of the low-lying $1_1^+,2_1^+,4_1^+$ states in $^{26}$F. Including three-body forces and coupling to the continuum effects improve the agreement between experiment and theory as compared to the use of two-body forces only.< Réduire

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Spectroscopy of $^{26}$F to probe proton-neutron forces close to the drip line

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