"Safe" Coulomb Excitation of 30Mg

Abstract

We report on the first radioactive beam experiment performed at the recently commissioned REX-ISOLDE facility at CERN in conjunction with the highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together with a thin nat-Ni target, Coulomb excitation of the first excited 2+ states of the projectile and target nuclei well below the Coulomb barrier was observed. From the measured relative de-excitation gamma ray yields the B(E2; 0+ -> 2+) value of 30Mg was determined to be 241(31) e2fm4. Our result is lower than values obtained at projectile fragmentation facilities using the intermediate-energy Coulomb excitation method, and confirms the theoretical conjecture that the neutron-rich magnesium isotope 30Mg lies still outside the ``island of inversion''.

Cited by in corpus (7)

• Discovery of the shape coexisting 0+ state in 32Mg by a two neutron transfer reaction
• Configuration mixing of angular-momentum projected triaxial relativistic mean-field wave functions. II. Microscopic analysis of low-lying states in magnesium isotopes
• Spectroscopy of 32Ne and the Island of Inversion
• Unveiling the intruder deformed 0${}_2^{+}$ state in ${}^{34}$Si
• Measurement of excited states in 40Si and evidence for weakening of the N=28 shell gap
• Structure of ${}^{30}$Mg explored via in-beam $\gamma$-ray spectroscopy
• Parity-projected Skyrme Hartree-Fock and angular momentum projection approach to Mg isotopes