Microsecond isomers of neutron-rich nuclei in the mass $A=95$ chain were investigated at the ILL reactor in Grenoble. These nuclei were produced by thermal-neutron induced fission of ${}^{241}\mathrm{Pu}$. The detection is based on time correlation between fission fragments selected by the Lohengrin mass spectrometer and the γ rays from the isomers. In this article, the decay scheme of an isomer of half-life 1.4(2) $\mu$s in ${}^{95}\mathrm{Kr}$ is reported. It is the first time that excited states of this nucleus have been measured. These data show that this neutron-rich $N=59$ isotone is spherical at low excitation energy.

• Received 12 January 2005

DOI:https://doi.org/10.1103/PhysRevC.73.037308