Pseudo spin doublet bands and Gallagher Moszkowski doublet bands in ${}^{100}$Y

Abstract

New transitions in neutron rich ${}^{100}$Y have been identified in a ${}^9$Be+${}^{238}$U experiment with mass- and Z- gates to provide full fragment identification. These transitions and high spin levels of ${}^{100}$Y have been investigated by analyzing the high statistics $\gamma$-$\gamma$-$\gamma$ and $\gamma$-$\gamma$-$\gamma$-$\gamma$ coincidence data from the spontaneous fission of ${}^{252}$Cf at the Gammasphere detector array. Two new bands, 14 new levels and 23 new transitions have been identified. The $K^{\pi }=4^{+}$ new band decaying to an 1s isomeric state is assigned to be the high-$K$ Gallagher-Moszkowski (GM) partner of the known $K^{\pi }=1^{+}$ band, with the $\pi 5/2[522]\otimes \nu 3/2[411]$ configuration. This 4${}^{+}$ band is also proposed to be the pseudo spin partner of the new $K^{\pi }=5^{+}$ band with a 5${}^{+}$ $\pi 5/2[422]\otimes \nu 5/2[413]$ configuration, to form a $\pi 5/2[422]\otimes \nu [312$ $5/2,3/2]$ neutron pseudospin doublet. Constrained triaxial covariant density functional theory and quantal particle rotor model calculations have been applied to interpret the band structure and available electromagnetic transition probabilities and are found in good agreement with experimental values.

References in corpus (7)

• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• New parametrization for the nuclear covariant energy density functional with point-coupling interaction
• Chiral bands for quasi-proton and quasi-neutron coupling with a triaxial rotor
• Evidence for Multiple Chiral Doublet Bands in ${}^{133}$Ce
• Multiple chiral doublet bands of identical configuration in 103Rh
• Chirality in odd-$A$ Rh isotopes within triaxial particle rotor model
• Chiral geometry of higher excited bands in triaxial nuclei with particle-hole configuration

Cited by in corpus (2)

• Fast trajectory reconstruction techniques for the large acceptance magnetic spectrometer VAMOS++
• Level structure of light neutron-rich La isotopes beyond the N=82 shell closure