199Pt

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N≈126 isotope ¹⁹⁹Pt

Y. Hirayama et al.
doi: 10.1103/PhysRevC.96.014307

The magnetic dipole moment and mean-square charge radius of $199g\mathrm{Pt}$ $(I^{\pi }=$ $5/2^{-},t_{1/2}=30.8$ min) ground state and $199m\mathrm{Pt}$ $(E_{\mathrm{ex}}=424$ keV, $I^{\pi }=$ (13/2)${}^{},t_{1/2}=13.6$ s) isomeric state are evaluated for the first time from investigations of the hyperfine splitting of the ${\lambda }_1=248.792$ nm transition by in-gas-cell laser ionization spectroscopy. Ground and isomeric states of neutron-rich $199\mathrm{Pt}$ nucleus were produced by a multinucleon transfer reaction at the KEK Isotope Separation System (KISS), designed for the study of nuclear spectroscopy in the vicinity of $N=126$. The measured magnetic dipole moments $+0.75$(8)${\mu }_N$ and $-0.57$(5)${\mu }_N$ are consistent with the systematics of those of nuclei with $I^{\pi }=$ $5/2^{-}$ and $I^{\pi }=$ $13/2^{+}$, respectively.