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High-sensitivity study of levels in Al30 following β decay of Mg30

Journal article published in 2016 by B. Olaizola, H. Mach, L. M. Fraile ORCID, J. Benito, M. J. G. Borge, R. Boutami, P. A. Butler, Z. Dlouhy, H. O. U. Fynbo, P. Hoff, S. Hyldegaard, H. B. Jeppesen, A. Jokinen, C. Jollet, A. Korgul and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

gamma-ray and fast-timing spectroscopy were used to study levels in Al-30 populated following the beta(-) decay of Mg-30. Five new transitions and three new levels were located in Al-30. A search was made to identify the third 1(+) state expected at an excitation energy of similar to 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) beta gamma gamma (t) method we have measured the lifetime of the 243.8-keV state to be T-1/2 = 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.