Nuclear structure evolution probed via transfer reactions and laser spectroscopy
Louis Lalanne
Vendredi 31/03/2023, 11:00-12:00
Bat 703, p 135 salle visio-conférence, CEA Saclay, Orme des Merisiers


This seminar will be two-fold: first the study of neutron deficient Ca isotopes using transfer reactions will be discussed, then preliminary results of the 2022 CRIS experimental campaign will be presented together with ongoing projects.

The 36Ca nucleus has several fascinating properties bringing together multiple fields of nuclear physics. In the mirror pair 36Ca-36S, the Coulomb interaction induces large isospin symmetry breaking effects that act as a magnifying glass of the structure of the excited states. The study of the corresponding mirror energy differences then allows to probe their structures and shapes. Furthermore, with 16 neutrons and 20 protons, 36Ca is expected to show features of a doubly magic nuclei. The magicity of the N=16 sub-shell closure has already been highlighted far from stability, in the neutron rich 24O but have still not been evidenced in the proton rich region. Finally, the 35K(p,γ)36Ca reaction has been identified as one of the ten (p,γ) reactions having the largest impact on the luminosity profile emitted during Type Ia X-ray burst. In this seminar, experimental results obtained at GANIL using (p,d) and (p,t) transfer reactions on 35Ca and 36Ca will be presented, together with their implication in the study of isospin symmetry breaking, shell evolution and nuclear astrophysics.

The Collinear Resonance Ionization Spectroscopy (CRIS) experiment is a laser spectroscopy setup operating at the ISOLDE facility of CERN, allowing to study the evolution of fundamental properties of the ground state (spin, electromagnetic moments and charge radii) as function of the neutron number. In 2022, the CRIS collaboration undertaken an experimental campaign aiming at the study of nuclear structure evolution along the Al and Ag chain, together with the first experimental study of the AcF radioactive molecule. The neutron-rich Al isotopes provide an excellent opportunity to investigate the evolution of nuclear structure crossing the N = 20 shell closure and the transition into the N=20 island of inversion. The Ag isotopes, with three proton holes in the Z=50 shell closure, are an ideal case to investigate the structural evolution approaching the N=50 and N=82 subshell closure, in the vicinity of 100Sn and 132Sn. Furthermore, when compared to the Z=49 In isotopes, the study of Ag isotopes allows to pin down the effect of additional proton holes on the electromagnetic properties of the ground state. During this presentation, the preliminary results of these experiments will be presented together with the prospects of the CRIS experiment for 2023.

Contact : Diane DORE


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