What question did this study set out to answer?

This research aims to investigate the excited states of neutron-rich odd-odd Cu isotopes, specifically $$^{74}$$Cu and $$^{76}$$Cu.

June 12, 2026Open Access

Evolution of the nuclear structure in neutron-rich Cu isotopes: first spectroscopy of odd-odd ^74Cu and ^76Cu

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This research aims to investigate the excited states of neutron-rich odd-odd Cu isotopes, specifically $$^{74}$$Cu and $$^{76}$$Cu.
Performed spectroscopic study following beta decay of $$^{74}$$Ni and $$^{76}$$Ni.
Utilized the EURICA setup and BigRIPS separator at RIKEN Nishina Center.
Analyzed gamma-gamma coincidences and performed large-scale Monte Carlo shell-model calculations.
No evidence of isomeric states in either nucleus based on beta-gamma time correlations.
Low-lying states interpreted as spin multiplets from particular orbital configurations.
Experimental findings align closely with theoretical predictions using the A3DA-m interaction model.

Resumen

Abstract Excited states in the odd-odd isotopes ^74 74 Cu and ^76 76 Cu were observed for the first time in a spectroscopic study following the β decay of ^74 74 Ni and ^76 76 Ni. The experiment was performed at the Radioactive Isotope Beam Factory at RIKEN Nishina Center using the EURICA setup and the BigRIPS separator. Level schemes were constructed based on the analysis of γ - γ coincidences. The time correlations between β and γ decay showed no evidence for population of isomeric states in either nucleus. The experimental results are compared to large-scale Monte Carlo shell-model calculations with the A3DA-m interaction. The low-lying states in ^74 74 Cu and ^76 76 Cu are interpreted as spin multiplets arising from the coupling of an odd proton in the 2p₃/₂ 2 p 3 / 2 or 1f₅/₂ 1 f 5 / 2 orbital with an odd neutron in the 1g₉/₂ 1 g 9 / 2 or 2p₁/₂ 2 p 1 / 2 orbital. The results provide information on the evolution of s

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