E0 transition strength in stable Ni isotopes

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Abstract

Excited states in $^{58,60,62}\mathrm{Ni}$ were populated via inelastic proton scattering at the Australian National University as well as via inelastic neutron scattering at the University of Kentucky Accelerator Laboratory. The Super-e electron spectrometer and the CAESAR Compton-suppressed HPGe array were used in complementary experiments to measure conversion coefficients and $\ensuremath{\delta}(E2/M1)$ mixing ratios, respectively, for a number of ${2}^{+}\ensuremath{\rightarrow}{2}^{+}$ transitions. The data obtained were combined with lifetimes and branching ratios to determine $E0,M1$, and $E2$ transition strengths between ${2}^{+}$ states. The $E0$ transition strengths between ${0}^{+}$ states were measured using internal conversion electron spectroscopy and compare well to previous results from internal pair formation spectroscopy. The $E0$ transition strengths between the lowest-lying ${2}^{+}$ states were found to be consistently large for the isotopes studied.

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