Abstract
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 , , and were measured for the first time. The experimental results show that the two-neutron separation energies in the vicinity of increase compared to neighboring nuclei. This shows that the masses of Ti isotopes near 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 is located close to the peak of the Jahn-Teller effect.
- Received 3 April 2020
- Revised 12 June 2020
- Accepted 21 July 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.122501
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