Speaker
Description
The heaviest self-conjugate system bound by the strong force, $^{100}$Sn (Z = N = 50), represents the last of the “classical” doubly magic nuclei awaiting experimental confirmation and the final member along the N = Z line. It has long been a central objective in the quest to understand how nuclear forces behave under extreme conditions. $^{100}$Sn also serves as a unique testing ground for proton-neutron symmetry at the edge of stability. With further proton captures suppressed by the closed shells, $^{100}$Sn is considered as the endpoint of the astrophysical rapid-proton ($rp$) process.
In this talk, we report on the first in-beam $\gamma$-ray and mass spectroscopy of $^{100}$Sn performed at the RIKEN Radioactive Isotope Beam Factory. The level scheme of $^{100}$Sn provides the first direct spectroscopic information on the nature of Z = N = 50 shell. Results compared with the state-of-the-art theoretical calculations will be discussed. In addition, the structures and masses of the neighbouring nuclei will also be presented.