We performed the first direct mass measurements of neutron-rich scandium, titanium, and vanadium isotopes around the neutron number 40 at the RIKEN RI Beam Factory using the time-of-flight magnetic-rigidity technique. The atomic mass excesses of Sc58-60, Ti60-62, and V62-64 were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of Ti62 increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near N=40 are affected by the Jahn-Teller effect. Therefore, a development of Jahn-Teller stabilization appears below the Cr isotopes, and the systematics in Sc, Ti, and V isotopes suggest that Ti62 is located close to the peak of the Jahn-Teller effect.
All Science Journal Classification (ASJC) codes