$\beta$ decay of 31Mg: Extending the "island of inversion"
STANOIU, M.
Institut de Physique Nucléaire d'Orsay [IPNO]
National Institute for Physics and Nuclear Engineering [NIPNE]
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Institut de Physique Nucléaire d'Orsay [IPNO]
National Institute for Physics and Nuclear Engineering [NIPNE]
Language
en
Article de revue
This item was published in
Physical Review C. 2005, vol. 72, p. 044314
American Physical Society
English Abstract
The beta of 31Mg has been investigated at GANIL. The ions were implanted in a silicon detector array surrounded by germanium gamma detectors. beta particles and subsequent gamma rays have been observed. The 31Mg half-life ...Read more >
The beta of 31Mg has been investigated at GANIL. The ions were implanted in a silicon detector array surrounded by germanium gamma detectors. beta particles and subsequent gamma rays have been observed. The 31Mg half-life has been measured (T_1/2=237pm25 ms) in good agreement with previously reported values. The decay scheme of 31Mg has been enriched with two new low-spin levels and seven new $\gamma$ transitions in 31Al. Most importantly, very weak feeding to the 31Al 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 31Mg. A good agreement for all observables is found, supporting the idea that 31Al is outside and 31Mg is inside the so-called "island of inversion."Read less <
English Keywords
Properties of nuclei with 20 <= A <= 38
Nuclear gamma transitions and level energies
Nuclear shell model
Origin
Hal imported