Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements

Abstract

The 'island of inversion' around ${}^{32}$Mg is one of the most important paradigm for studying the disappearance of the stabilizing 'magic' of a shell closure. We present the first Penning-trap mass measurements of the exotic nuclides ${}^{29-31}$Na and ${}^{30-34}$Mg, which allow a precise determination of the empirical shell gap for ${}^{32}$Mg. The new value of 1.10(3) MeV is the lowest observed shell gap for any nuclide with a canonical magic number.

6 pages, 4 figures, submitted to Physical Review C

References in corpus (7)

• Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XII: Stiffness and stability of neutron-star matter
• Precision Atomic Physics Techniques for Nuclear Physics with Radioactive Beams
• Discovery of the shape coexisting 0+ state in 32Mg by a two neutron transfer reaction
• Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei
• New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces
• Spectroscopy of 32Ne and the Island of Inversion
• Collectivity-induced quenching of signatures for shell closures

Cited by in corpus (10)

• Time-of-flight mass measurements of neutron-rich chromium isotopes up to N = 40 and implications for the accreted neutron star crust
• Modification of magicity towards the dripline and its impact on electron-capture rates for stellar core-collapse
• Ground-state properties and symmetry energy of neutron-rich and neutron-deficient Mg isotopes
• Precision mass measurements of magnesium isotopes and implications on the validity of the Isobaric Mass Multiplet Equation
• High-precision quadrupole moment reveals significant intruder component in 33Al20 ground state
• Neutron Shell Closure at N=32 and N=40 in Ar and Ca Isotopes
• Binding energies of ground and isomeric states in neutron-rich ruthenium isotopes: measurements at JYFLTRAP and comparison to theory
• Improvements to TITAN's Mass Measurement and Decay Spectroscopy Capabilities
• Configuration interaction relativistic Hartree-Fock model
• A Novel Transparent Charged Particle Detector for the CPET Upgrade at TITAN