First $g({2}^{+})$ measurement on neutron-rich ${}^{72}$Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

First $g (2^{+})$ measurement on neutron-rich $^{72}$ Zn, and the high-velocity transient field technique for radioactive heavy-ion beams

E. Fiori et al.

Phys. Rev. C 85, 034334 – Published 29 March 2012

Abstract

The high-velocity transient-field (HVTF) technique was used to measure the $g$ factor of the 2 $^{+}$ state of $^{72}$ Zn produced as a radioactive beam. The transient-field strength was probed at high velocity in ferromagnetic iron and gadolinium hosts using $^{76}$ Ge beams. The potential of the HVTF method is demonstrated and the difficulties that need to be overcome for a reliable use of the TF technique with high- $Z$ , high-velocity radioactive beams are revealed. The polarization of $K$ -shell vacancies at high velocity, which shows more than an order of magnitude difference between $Z = 20$ and $Z = 30$ is discussed. The $g$ -factor measurement hints at the theoretically predicted transition in the structure of the Zn isotopes near $N = 40$ .