Elsevier

Nuclear Physics A

Volume 394, Issue 3, 28 February 1983, Pages 378-386
Nuclear Physics A

Mapping of the onset of a new region of deformation: The masses of 31Mg and 32Mg

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Abstract

Qβ values are measured by the shape-fitting method, applied to selected γ-coincident β-energy spectra of 31Mg and 32Na. The deduced mass excesses of 31Mg and 32Mg are 5.0 ± 0.7 and − 1.9 ± 1.5 MeV, respectively. The corresponding two-neutron binding energies S2n are in marked excess over the values extrapolated from the S2n variation with A established for less neutron-rich nuclei. This is taken as an indication for the onset of deformation at N = 19 for Mg isotopes.

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Present address: GANIL, BP 5027, 14021 Caen-Cedex, France.

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