Suchergebnisse

Part of the WAS3ABi was supported by the Rare Isotope Science Project which is funded by the Ministry of Education, Science, and Technology (MEST) and National Research Foundation (NRF) of Korea (2013M7A1A1075764). This work was partially supported by KAKENHI (Grants No. 25247045), the RIKEN Foreign Research Program, the SpanishMinisterio de Ciencia e Innovacin (Contracts No. FPA 2009-13377-C02 and No. FPA2011-29854-C04), the UK Science and Technology Facilities Council, the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, Contract No. DE-AC02-06CH11357, under the auspices of the NNSA of the U.S. DOE at Los Alamos National Laboratory under Contract No. DE AC52-06NA25396, the NASA Grant No. NNX10AH78G, the National Research Foundation Grant funded by the Korean Government (Grants No. NRF-2009-0093817, No. NRF-2015R1D1A1A01056918, No. NRF-2016 R1A5A1013277, and No. NRF-2013R1A1A2063017), and the Hungarian Scientific Research Fund OTKA Contract No. K100835.

18 pags., 10 figs., 4 tabs. ; The β- decay of Zn81 to the neutron magic N=50 nucleus Ga81, with only three valence protons with respect to Ni78, was investigated. The study was performed at the ISOLDE facility at CERN by means of γ spectroscopy. The Zn81 half-life was determined to be T1/2=290(4) ms while the β-delayed neutron emission probability was measured as Pn=23(4)%. The analysis of the β-gated γ-ray singles and γ-γ coincidences from the decay of Zn81 provides 47 new levels and 70 new transitions in Ga81. The β-n decay of Zn81 was observed and a new decay scheme into the odd-odd Ga80 nucleus was established. The half-lives of the first and second excited states of Ga81 were measured via the fast-timing method using LaBr3(Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of Ga81 is interpreted in terms of the coupling of the three valence protons outside the doubly magic Ni78 core. ; This work was supported by the Spanish MINECO through the FPA2015-65035-P and RTI2018-098868-B-I00 projects, by the U.S. DoE Grant No. DE-FG02-94ER40834, by the German BMBF Grant 05P19PKFNA, and Grupo de Física Nuclear (GFN) at UCM. The support by the European Union Seventh Framework through ENSAR (Contract No. 262010) and ISOLDE (CERN) Collaboration is acknowledged. V.P. acknowledges support by the Spanish FPI-BES-2011-045931 grant.