The nuclei having A ~120 (50 ≤ Z ≤ 56) are of considerable interest because of the competing shape driving tendencies of their orbitals occupied by the neutrons and the protons. Due to presence of both quadrupole and the octupole collectivity in the neutron deficient Ba, Cs and Xe nuclei with mass A ~ 120 have attracted much attention in recent years. For nuclei with A < 120, due to their...
In this research, we tested a new idea to measure proton-distribution radii ($r_{\rm{p}}$) by heavy-ion secondary beam experiments. It is important for understanding the structures of nuclei to know the proton- and the neutron-distribution radii independently. From this point of view, we tried to develop a new method to deduce proton-distribution radii ($r_{\rm{p}}$) very efficiently using...
$^{100}$Sn (N=Z=50) and its neighboring nuclei have drawn great attention due to its possible doubly-magic nature and location around the proton drip-line. Being predicted as the end point of rp-process path, the properties of these nuclei also directly affect the synthesis of heavier elements. We therefore performed in-beam $\gamma$-ray spectroscopy of $^{100}$Sn and the neighboring nuclei...
Understanding the nature of two sequential occurrences of the Gamow-Teller transition is important not only for the nuclear structure but also for the particle physics. However, there is little experimental information about the double Gamow-Teller transition at present. Especially, although the existence of a giant resonance state in double Gamow-Teller transition (Double Gamow-Teller Giant...
