Coulomb excitation of (31)Mg

M. Seidlitz, D. Muecher, P. Reiter, V. Bildstein, A. Blazhev, N. Bree, B. Bruyneel, J. Cederkall, E. Clement, T. Davinson, P. Van Duppen, A. Ekstrom, F. Finke, L. M. Fraile, K. Geibel, R. Gernhaeuser, H. Hess, A. Holler, M. Huyse, O. IvanovJ. Jolie, M. Kalkuehler, T. Kotthaus, R. Kruecken, R. Lutter, E. Piselli, H. Scheit, I. Stefanescu, J. Van de Walle, D. Voulot, N. Warr, F. Wenander, A. Wiens

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Abstract / Description of output

The ground state properties of (31)Mg indicate a change of nuclear shape at N = 19 with a deformed J(pi) = 1/2(+) intruder state as a ground state, implying that (31)Mg is part of the ``island of inversion''. The collective properties of excited states were the subject of a Coulomb excitation experiment at REX-ISOLDE, CERN, employing a radioactive (31)Mg beam. De-excitation gamma-rays were detected by the MINIBALL gamma-spectrometer in coincidence with scattered particles in a segmented Si-detector. The level scheme of (3I)Mg was extended. Spin and parity assignment of the 945 keV state yielded 5/2(+) and its de-excitation is dominated by a strong collective M1 transition. Comparison of the transition probabilities of (30,31,32)Mg establishes that for the N = 19 magnesium isotope not only the ground state but also excited states are largely dominated by a deformed pf intruder configuration. (C) 2011 Elsevier B.V. All rights reserved.
Original languageUndefined/Unknown
Pages (from-to)181-186
Number of pages6
JournalPhysics Letters B
Issue number3-4
Publication statusPublished - 13 Jun 2011

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