Low-lying isomeric states in 80Ga from the β- decay of 80Zn

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A new level scheme of 80Ga has been determined. This nucleus was populated following the β− decay of 80Zn at ISOLDE, CERN. The proposed level scheme is significantly different compared to the previously reported one and contains 26 levels up to 3.4 MeV in excitation energy. The present study establishes that the previously identified 1.9-s β− -decaying 6− isomer is the ground state of 80Ga and the 1.3-s β− -decaying 3− isomer lies at an excitation energy of 22.4 keV. A new isomeric level was identified at 707.8 keV and its half-life was measured to be 18.3(5) ns, allowing the 685.4-keV transition de-exciting this state to be assigned anM2 multipolarity. The newly measured spectroscopic observables are compared with shell-model calculations using the jj44bpn and JUN45 interactions.
© 2014 American Physical Society. This work was partially supported by the Spanish Ministry of Science and Innovation through Projects No. FPA2010-17142 and No. CSD-2007-00042 (CPAN Consol´ıder, Ingenio2010), by the Romanian ANCS/IFA Grant No. 6 ISOLDE, by the German BMBF under Grant No. 05P12PKFNE, and by the U.S. Department of Energy, Office of Nuclear Physics, under Grant No. DE-FG02-94ER40834. It was also partly funded by the NuPNET network FATIMA-NuPNET (PRIPIMNUP-2011-1338) and by the European Union Seventh Framework through ENSAR (Contract No. 262010). We kindly acknowledge support from the ISOLDE Collaboration and the ISOLDE physics and technical groups. The fasttiming electronics was provided by the Fast Timing Pool of Electronics and MASTICON.
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