beta decay of Mg31: Extending the 'island of inversion' - INSPIRE

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beta decay of Mg31: Extending the 'island of inversion'

F. Marechal
(
- Strasbourg, IReS
)
,
D.L. Balabanski
(
- Leuven U. and
- Camerino U.
)
,
D. Borremans
(
- Leuven U.
)
,
J.-M. Daugas
(
- CEA DAM
)
,
F.de Oliveira Santos
(
- GANIL
)

Oct, 2005

9 pages

Published in:

Phys.Rev.C 72 (2005) 044314,
Phys.Rev.C 76 (2007) 059902 (erratum)

DOI:

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Abstract: (APS)

The β decay of Mg31 has been investigated at GANIL. The ions were implanted in a silicon detector array surrounded by germanium γ detectors. β particles and subsequent γ rays have been observed. The Mg31 half-life has been measured (T1/2=237±25 ms) in good agreement with previously reported values. The decay scheme of Mg31 has been enriched with two new low-spin levels and seven new γ transitions in Al31. Most importantly, very weak feeding to the Al31 ground and lowest excited states has been established. These results are compared to new shell-model calculations in the sd−fp valence space, using an interaction that was modified in order to reproduce the recently established low-energy level scheme of Mg31. A good agreement for all observables is found, supporting the idea that Al31 is outside and Mg31 is inside the so-called “island of inversion.”

27.30.+t
23.20.Lv
21.60.Cs

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