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Elucidation of the Anomalous A=9 Isospin Quartet Behavior

M. Brodeur T. Brunner S. Ettenauer A. Lapierre R. Ringle B. A. Brown D. Lunney 1 J. Dilling
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : Recent high-precision mass measurements of Li-9 and Be-9, 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 J(pi) = 3/2(-) quartet and the vanishing cubic term for the excited J(pi) = 1/2(-) multiplet depend upon the presence of a nearby T = 1/2 state in B-9 and Be-9 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 J(pi) is needed.
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Submitted on : Monday, July 2, 2012 - 5:04:32 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:36 PM

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M. Brodeur, T. Brunner, S. Ettenauer, A. Lapierre, R. Ringle, et al.. Elucidation of the Anomalous A=9 Isospin Quartet Behavior. Physical Review Letters, American Physical Society, 2012, 108, pp.212501. ⟨10.1103/PhysRevLett.108.212501⟩. ⟨in2p3-00713817⟩



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