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

doi:10.1103/PhysRevC.99.064330

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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Abstract

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 language	English
Article number	064330
Journal	Physical Review C
Volume	99
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.99.064330
Publication status	Published - 26 Jun 2019
Externally published	Yes

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2019 06 12 Longfellow et al SpectroscopyAccepted author manuscript, 2.71 MB

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

abstract = "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.",

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

year = "2019",

month = jun,

day = "26",

doi = "10.1103/PhysRevC.99.064330",

language = "English",

volume = "99",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

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TY - JOUR

T1 - Spectroscopy and lifetime measurements near the proton drip line

T2 - 26,27,28P

AU - Longfellow, B.

AU - Gade, A.

AU - Brown, B.A.

AU - Bazin, D.

AU - Bender, P.C.

AU - Bowry, M.

AU - Cottle, P.D.

AU - Elman, B.

AU - Lunderberg, E.

AU - Magilligan, A.

AU - Spieker, M.

AU - Weisshaar, D.

AU - Williams, S.J.

PY - 2019/6/26

Y1 - 2019/6/26

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevC.99.064330

DO - 10.1103/PhysRevC.99.064330

M3 - Article

SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064330

ER -

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

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