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26 April 2024

» pubmed » pmid15089126

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Unambiguous identification of three beta-decaying isomers in 70Cu
J Van Roosbroeck ; C Guénaut ; G Audi ; 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 Lunney ; 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 ;
Date:	19 Mar 2004
Journal:	Phys Rev Lett, 92 (11), 112501
Abstract:	Using resonant laser ionization, beta-decay studies, and for the first time mass measurements, three beta-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 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 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.
Source:	PubMed, pmid15089126
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