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In-gas-cell laser resonance ionization spectroscopy of Ir 196,197,198

par Mukai, Momo;Hirayama, Yoshikazu;Watanabe, Yutaka Y.X.;Schiffmann, Sacha ;Ekman, Jörgen;Godefroid, Michel ;Schury, Peter;Kakiguchi, Yutaka;Oyaizu, Michihiro;Wada, Michiharu;Jeong, Sunchan S.C.;Moon, Junyoung J.Y.;Park, Jin-hyung;Ishiyama, Hironobu;Kimura, Sota;Ueno, Hironori;Ahmed, Murad;Ozawa, Akira;Watanabe, Hiroshi;Kanaya, S.;Miyatake, Hiroari
Référence Physical Review C, 102, 5, 054307
Publication Publié, 2020-11-01

Article révisé par les pairs

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Résumé :

Hyperfine structure (HFS) measurements of neutron-rich iridium isotopes Ir196,197,198 (Z=77,N=119-121) were performed via in-gas-cell laser resonance ionization spectroscopy at the KEK Isotope Separation System. Magnetic dipole moments μ and isotope shifts were determined from the HFS spectra. The variation of mean-square charge radii and quadrupole deformation parameters of these isotopes were evaluated from the isotope shifts. The μ value of Ir197 agreed with a theoretical value based on the strong coupling model, and the Ir nucleus was interpreted as prolately deformed by the theoretical calculations. The μ values of Ir196,198 were also compared with semiempirical values calculated based on the strong coupling model. From the comparison, we can suggest the possible spin values of Iπ=1,2- for Ir196 and Iπ=1- for Ir198.