Lifetime measurements for neutron-rich nuclei around

Nowadays it has became clear that the magic numbers are not immutable and they can change as a function of the isospin, due to the influence of the residual interaction between valence orbitals [1]. Such a structural change in neutron-rich nuclei is verified in the appearance of the N = 32 subshell closure in nuclei located just above the doublymagic Ca and this can be inferred by different experimental hints [2]. The B(E2) reduced transition probability, which can be derived from lifetime measurements, is complementary to the energy information and is expected to be small and comparable with single-particle estimates going towards shell closures. For the calcium isotopic chain, the spectroscopic information is nevertheless limited to the energies of the excited states, especially in the neutron-rich part, and almost no lifetime information is available.