γspectroscopy of calcium nuclei around doubly magic48Ca using heavy-ion transfer reactions

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Abstract

The $\ensuremath{\gamma}$ decays of neutron-rich Ca isotopes around ${}^{48}$Ca were measured at Legnaro National Laboratory with the PRISMA-CLARA setup, using the heavy-ion transfer reactions ${}^{48}$Ca on ${}^{64}$Ni and ${}^{48}$Ca on ${}^{208}$Pb at $\ensuremath{\approx}$6 MeV/A. The work shows the feasibility to perform full in-beam $\ensuremath{\gamma}$ spectroscopy with heavy-ion transfer reactions (in terms of angular distributions, polarizations, and lifetimes analysis), providing a method that can be further exploited in the future with heavy targets and radioactive beams. For the one-neutron transfer channels, ${}^{49}$Ca and ${}^{47}$Ca, shell-model and particle-vibration coupling calculations are used to understand the nature of the states. In particular, in both nuclei evidence is found for particle-vibration coupled states based on the 3${}^{\ensuremath{-}}$ phonon of ${}^{48}$Ca. In the two-neutron transfer channels, ${}^{46}$Ca and ${}^{50}$Ca, the experimental data are in global agreement with predictions based on full $fp$ shell-model calculations.

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