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European Physical Journal A 28 (2006) 129-138
High precision mass measurements of 29-33Mg and the shell-opening effect at N=20
David Lunney1, Georges Audi1, Michel De Saintsimon1, Carole Gaulard1, Catherine Thibault1, Nelson Vieira1
ISOLDE Collaboration(s)

High precision mass measurements have been performed on the exotic magnesium isotopes 29-33Mg using the MISTRAL radiofrequency spectrometer, especially suited to very short-lived nuclides. This method, combined with the powerful tool of resonant laser ionization at ISOLDE, has provided a significant reduction of uncertainty for the masses of the most exotic Mg isotopes: a relative error of 7X10-7 was achieved for the weakly produced 33Mg that has a half-life of only 90 ms. Moreover, the mass of 33Mg is found to change by over 250 keV. Verifying and minimizing binding energy uncertainties in this region of the nuclear chart is important for understanding the phenomenon of shell opening: the lack of binding energy that is normally associated with magic numbers.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale
Binding energies and masses 20 \leq A \leq 38 nuclides charged particle spectrometers: electric and magnetic
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