Improved measurement of the $0_2^{+}\to 0_1^{+}$ E0 transition strength for ${}^{72}$Se using the SPICE spectrometer

Abstract

The selenium isotopes lie at the heart of a tumultuous region of the nuclear chart where shape coexistence effects grapple with neutron-proton pairing correlations, triaxiality, and the impending proton dripline. In this work a study of ${}^{72}$Se by internal conversion electron and $\gamma$-ray spectroscopy was undertaken with the SPICE and TIGRESS arrays. New measurements of the branching ratio and lifetime of the $0_2^{+}$ state were performed yielding a determination of ${\rho }^2(E0;0_2^{+}\to 0_1^{+})=29(3)$ milliunits. two state mixing calculations were performed that highlighted the importance of interpretation of such $E0$ strength values in the context of shape-coexistence.

References in corpus (7)

• Shape coexistence and the role of axial asymmetry in ${}^{72}$Ge
• Structural evolution in germanium and selenium nuclei within the mapped interacting boson model based on the Gogny energy density functional
• Shape changes in the mirror nuclei ${}^{70}$Kr and ${}^{70}$Se
• Shape coexistence revealed in the $N=Z$ isotope ${}^{72}$Kr through inelastic scattering
• Table of electronic factors for E0 electron and electron-positron pair conversion transitions
• Convergence of electric quadrupole rotational invariants from the nuclear shell model
• In-beam internal conversion electron spectroscopy with the SPICE detector

Cited by in corpus (1)

• The ICESPICE demonstrator for particle/$\gamma$-$e^{-}$ coincidence experiments at Florida State University