Elucidation of the anomalous A=9 isospin quartet behavior

M. Brodeur; T. Brunner; S. Ettenauer; A. Lapierre; R. Ringle; B. A. Brown; D. Lunney; J. Dilling

doi:10.1103/PhysRevLett.108.212501

Elucidation of the anomalous A=9 isospin quartet behavior

M. Brodeur, T. Brunner, S. Ettenauer, A. Lapierre, R. Ringle, B. A. Brown, D. Lunney, J. Dilling

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Abstract

Recent high-precision mass measurements of Li9 and Be9, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17)keV term for the Jπ=3/2 ^- quartet and the vanishing cubic term for the excited Jπ=1/2 ^- multiplet depend upon the presence of a nearby T=1/2 state in B9 and Be9 that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their Jπ is needed.

Original language	English
Article number	212501
Journal	Physical Review Letters
Volume	108
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.108.212501
State	Published - May 23 2012
Externally published	Yes

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title = "Elucidation of the anomalous A=9 isospin quartet behavior",

abstract = "Recent high-precision mass measurements of Li9 and Be9, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17)keV term for the Jπ=3/2 - quartet and the vanishing cubic term for the excited Jπ=1/2 - multiplet depend upon the presence of a nearby T=1/2 state in B9 and Be9 that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their Jπ is needed.",

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T1 - Elucidation of the anomalous A=9 isospin quartet behavior

AU - Brodeur, M.

AU - Brunner, T.

AU - Ettenauer, S.

AU - Lapierre, A.

AU - Ringle, R.

AU - Brown, B. A.

AU - Lunney, D.

AU - Dilling, J.

PY - 2012/5/23

Y1 - 2012/5/23

N2 - Recent high-precision mass measurements of Li9 and Be9, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17)keV term for the Jπ=3/2 - quartet and the vanishing cubic term for the excited Jπ=1/2 - multiplet depend upon the presence of a nearby T=1/2 state in B9 and Be9 that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their Jπ is needed.

AB - Recent high-precision mass measurements of Li9 and Be9, performed with the TITAN Penning trap at the TRIUMF ISAC facility, are analyzed in light of state-of-the-art shell model calculations. We find an explanation for the anomalous isobaric mass multiplet equation behavior for the two A=9 quartets. The presence of a cubic d=6.3(17)keV term for the Jπ=3/2 - quartet and the vanishing cubic term for the excited Jπ=1/2 - multiplet depend upon the presence of a nearby T=1/2 state in B9 and Be9 that induces isospin mixing. This is contrary to previous hypotheses involving purely Coulomb and charge-dependent effects. T=1/2 states have been observed near the calculated energy, above the T=3/2 state. However, an experimental confirmation of their Jπ is needed.

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Elucidation of the anomalous A=9 isospin quartet behavior

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