Abstract
Excited states in $^{142}\mathrm{Cs}$ and $^{144}\mathrm{Cs}$, populated in the spontaneous fission of $^{248}\mathrm{Cm}$ and $^{252}\mathrm{Cf}$ and in thermal neutron-induced fission of $^{235}\mathrm{U}$ and $^{242}\mathrm{Am}$ were studied by means of $\ensuremath{\gamma}$ spectroscopy using the EUROGAM2 and Gammasphere multidetector Ge arrays and the LOHENGRIN fission-fragment separator, respectively. In $^{142}\mathrm{Cs}$, a band and an isomer with a half-life of ${T}_{1/2}=11(3)$ ns have been identified. Spins and parities have been proposed for excited levels in this nucleus. In $^{144}\mathrm{Cs}$ excited levels have been observed. A ${T}_{1/2}=1.1(1)$ $\ensuremath{\mu}$s isomer was found with a $\ensuremath{\gamma}$ cascade, which probably feeds this isomer. There is also an indication of a nanosecond isomer in $^{144}\mathrm{Cs}$. Quasiparticle-rotor model calculations done in this work allowed proton-neutron configurations to be proposed for levels in $^{142}\mathrm{Cs}$ and $^{144}\mathrm{Cs}$.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
