Spectroscopy and lifetime measurements near the proton drip line: 26,27,28P

B. Longfellow, A. Gade, B.A. Brown, D. Bazin, P.C. Bender, M. Bowry, P.D. Cottle, B. Elman, E. Lunderberg, A. Magilligan, M. Spieker, D. Weisshaar, S.J. Williams

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We report on the observation of excited states in the neutron-deficient phosphorus isotopes 26,27,28P via in-beam γ-ray spectroscopy with both high-efficiency and high-resolution detector arrays. In 26P, a previously unobserved level has been identified at 244(3) keV, two new measurements of the astrophysically important 3/2+ resonance in 27P have been performed, γ decays have been assigned to the proton-unbound levels at 2216 and 2483 keV in 28P, and the γ-ray line-shape method has been used to make the first determination of the lifetimes of the two lowest-lying excited states in 28P. The expected Thomas-Ehrman shifts were calculated and applied to levels in the mirror nuclei. The resulting level energies from this procedure were then compared with the energies of known states in 26,27,28P.
Original languageEnglish
Article number064330
JournalPhysical Review C
Issue number6
Publication statusPublished - 26 Jun 2019
Externally publishedYes


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