High-sensitivity study of levels in Al 30 following β decay of Mg 30

Abstract : γ-ray and fast-timing spectroscopy were used to study levels in Al30 populated following the β− decay of Mg30. Five new transitions and three new levels were located in Al30. A search was made to identify the third 1+ state expected at an excitation energy of ∼2.5 MeV. Two new levels were found, at 3163.9 and 3362.5 keV, that are firm candidates for this state. Using the advanced time-delayed (ATD) βγγ(t) method we have measured the lifetime of the 243.8-keV state to be T1/2=15(4)ps, which implies that the 243.8-keV transition is mainly of M1 character. Its fast B(M1;2+→3+) value of 0.10(3) W.u. is in very good agreement with the USD shell-model prediction of 0.090 W.u. The 1801.5-keV level is the only level observed in this study that could be a candidate for the second excited 2+ state.
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Submitted on : Tuesday, November 22, 2016 - 10:28:20 AM
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B. Olaizola, H. Mach, M. Fraile, J. Benito, M. Borge, et al.. High-sensitivity study of levels in Al 30 following β decay of Mg 30. Physical Review C, American Physical Society, 2016, 94 (5), pp.054318. ⟨10.1103/PhysRevC.94.054318⟩. ⟨in2p3-01400547⟩

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