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Physical Review Letters 92 (2004) 112501
Unambiguous Identification of Three $\beta$-Decaying Isomers in $^{70}$Cu
J. Van Roosbroeck, C. Guénaut1, G. Audi1, D. Beck, K. Blaum, G. Bollen, J. Cederkall, P. Delahaye, A. De Maesschalck, H. De Witte, D. Fedorov, V. N. Fedoseyev, S. Franchoo, H. O. U. Fynbo, M. Górska, F. Herfurth, K. Heyde, M. Huyse, A. Kellerbauer, H.-J. Kluge, U. Köster, K. Kruglov, D. Lunney1, V. I. Mishin, W. F. Mueller, Sz. Nagy, S. Schwarz, L. Schweikhard, N. A. Smirnova, K. Van de Vel, P. Van Duppen, A. Van Dyck, W. B. Walters, L. Weissman, C. Yazidjian

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.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Physique Nucléaire Expérimentale
nuclei with mass number 59 to 89 – nuclear isomerism – beta-decay – ground states – nuclear energy levels – wave functions – nuclear shell model
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