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Unambiguous Identification of Three $\beta$-Decaying Isomers in $^{70}$Cu

Abstract : Using resonant laser ionization, $\beta$-decay studies, and for the first time mass measurements, three $\beta$-decaying states have been unambiguously identified in $^{70}$Cu. A mass excess of –62 976.1(1.6) keV and a half-life of 44.5(2) s for the (6$^–$) ground state have been determined. The level energies of the (3$^–$) isomer at 101.1(3) keV with $T_{1/2}$ = 33(2) s and the 1$^+$ isomer at 242.4(3) keV with $T_{1/2}$ = 6.6(2) s are confirmed by high-precision mass measurements. The low-lying levels of $^{70}$Cu populated in the decay of $^{70}$Ni and in transfer reactions compare well with large-scale shell-model calculations, and the wave functions appear to be dominated by one proton–one neutron configurations outside the closed Z = 28 shell and N = 40 subshell. This does not apply to the 1$^+$ state at 1980 keV which exhibits a particular feeding and deexcitation pattern not reproduced by the shell-model calculations.
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Submitted on : Friday, March 30, 2007 - 10:38:35 AM
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J. van Roosbroeck, C. Guénaut, G. Audi, D. Beck, K. Blaum, et al.. Unambiguous Identification of Three $\beta$-Decaying Isomers in $^{70}$Cu. Physical Review Letters, American Physical Society, 2004, 92, pp.112501. ⟨10.1103/PhysRevLett.92.112501⟩. ⟨in2p3-00139278⟩

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