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Physical Review Letters 108 (2012) 212501
Elucidation of the Anomalous A=9 Isospin Quartet Behavior
M. Brodeur, T. Brunner, S. Ettenauer, A. Lapierre, R. Ringle, B. A. Brown, D. Lunney1, J. Dilling
(2012)

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.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
CSNSM SNO
Physique/Physique Nucléaire Expérimentale
ATOMIC MASS EVALUATION – HIGH-PRECISION – SHELL-MODEL – 1P SHELL – EQUATION – TITAN – ACCURACY – NUCLEI – IONS
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1204.4133v1