High-precision masses of 29-33Mg and the N = 20 shell “closure” |
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Authors: | D Lunney G Audi C Gaulard M de Saint Simon C Thibault N Vieira |
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Institution: | (1) Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), IN2P3/CNRS-Université Paris Sud, Batiment 108, F-91405 Orsay, France |
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Abstract: | High-precision mass measurements have been performed on the exotic magnesium isotopes 29-33Mg using the MISTRAL radiofrequency spectrometer, especially suited for 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 7×10-7 was achieved for the weakly produced 33Mg that has a half-life of only 90ms. Moreover, the mass of 33Mg is found to change by over 250keV. Verifying and minimizing binding energy uncertainties in this region of the nuclear
chart is important for understanding the lack of binding energy that is normally associated with magic numbers. |
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Keywords: | 21 10 Dr Binding energies and masses 27 30 +t 20 ⩽ A ⩽ 38 29 30 Aj Charged-particle spectrometers: electric and magnetic |
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