Neutron-unbound states in 25,26F

N Frank, John D Albertson, J. Bailey, T. Baumann, D. Bazin, B. A. Brown, J. Brown, P. A. Deyoung, J. E. Finck, A. Gade, J. Hinnefeld, Rosalind E. Howes, M. Kasperczyk, Belinda Luther, William A Peters, A. Schiller, A. Smith, M. Thoennessen, J. A. Tostevin

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Neutron-unbound states in 25F and 26F were populated via the reactions 9Be(26Ne,24F+n) and 9Be(26Ne,25F+n), respectively. A resonance close to the neutron separation energy in 25F was identified with a decay energy of 28±4 keV. This resonance corresponds to an excited state in 25F at 4249±116 keV assuming it decays to the ground state of 24F. Guided by shell-model calculations, a spin and parity of 1/2- can be assigned to this state. In the spectrum of 26F, which was produced in a nucleon-exchange reaction, there are indications for an excited state with a decay energy of ∼270 keV.

Original languageEnglish
Article number037302
JournalPhysical Review C
Issue number3
Publication statusPublished - 6 Sep 2011
Externally publishedYes

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