Neutron-rich nuclei in the N=28-40 region provide a good testing ground of shell evolution. The conventional N=28 magic number is known to be disappear in S, Si, and Mg isotopes, and a new magic number N=34 had been predicted since 2001. One of the most important ingredients to cause those phenomena is the monopole interaction between a proton in the sd shell and a neturon in the pf shell. In...
The $^{52}$Ca(p,pn)$^{51}$Ca reaction was measured in inverse kinematics during the SEASTAR3 experimental campaign at the Radioactive Isotope Beam Factory (RIBF). The proton-induced quasi-free neutron knock-out reaction was performed at ∼230 MeV/nucleon using MINOS, a 150-mm long liquid hydrogen target and the MINOS TPC, combined with prompt $\gamma$ spectroscopy. Inclusive and exclusive cross...
Breakthroughs in our treatment of the many-body problem and nuclear forces are rapidly transforming modern nuclear theory into a true first-principles discipline. This allows us to address some of the most exciting questions at the frontiers of nuclear structure and physics beyond the standard model.
In this talk I will briefly outline our many-body approach, the valence-space in-medium...
Shell gaps represent the backbone of the nuclear structure and are a direct fingerprint of the in-medium many-body interactions. The nuclear shell structure is found to change, sometimes drastically, with the number of protons and neutrons, revealing how delicate the arrangement of interacting nucleons is. Recent experimental evidence favors a new doubly-magic nucleus 54Ca with a neutron...
The nuclear magic numbers correspond to large energy gaps between successive nucleon orbits. In stable nuclei, these correspond to 2, 8, 20, 28, 50, 82, and 126, however, in exotic nuclei the 20 and 28 magic numbers are known to disappear, whilst 32 and 34 emerge as "non-canonical" magic numbers. The latter was first inferred through $\gamma$-ray spectroscopy of $^{54}$Ca at the RIBF, with...
