Phys. Rev. Lett. 92, 112501 (2004) [4 pages]Unambiguous Identification of Three β-Decaying Isomers in 70CuReceived 12 November 2003; published 17 March 2004 Using resonant laser ionization, β-decay studies, and for the first time mass measurements, three β-decaying states have been unambiguously identified in 70Cu. 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 T1/2=33(2) s and the 1+ isomer at 242.4(3) keV with T1/2=6.6(2) s are confirmed by high-precision mass measurements. The low-lying levels of 70Cu populated in the decay of 70Ni 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.112501
DOI:
10.1103/PhysRevLett.92.112501
PACS:
21.10.Dr, 07.75.+h, 27.50.+e, 32.80.Fb
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