Decay studies of the long-lived states in Tl-186

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Decay spectroscopy of the long-lived states in Tl-186 has been performed at the ISOLDE Decay Station at ISOLDE, CERN. The a decay from the low-spin (2(-)) state in Tl-186 was observed for the first time and a half-life of 3.4(-0.)(4)(+0.5) s was determined. Based on the alpha-decay energy, the relative positions of the long-lived states were fixed, with the (2(-)) state as the ground state, the 7((+)) state at 77(56) keV, and the 10((-)) state at 451(56) keV. The level scheme of the internal decay of the Tl-186(10((-))) state [T-1/2 = 3.40(9) s], which was known to decay solely through emission of 374-keV gamma-ray transition, was extended and a lower limit for the beta-decay branching b(beta) > 5.9(3)% was determined. The extracted retardation factors for the gamma decay of the 10((-) )state were compared to the available data in neighboring odd-odd thallium isotopes indicating the importance of the pi d(3/2) shell in the isomeric decay and significant structure differences between Tl-184 and Tl-186.
Artículo firmado por 48 autores. We acknowledge the support of the ISOLDE Collaboration and technical teams. This project has received funding from the European Unions Horizon 2020 research and innovation programme Grant Agreements No. 654002 (ENSAR2) and No. 665779. This work has been funded by FWO-Vlaanderen (Belgium), by GOA/2015/010 (BOF KU Leuven), by the Interuniversity Attraction Poles Programme initiated by the Belgian Science Policy Office (BriX network P7/12), by the Slovak Research and Development Agency (Contract No. APVV-18-0268), by the Slovak Grant Agency VEGA (Contract No. 1/0532/17), by the Spanish Research Council under Contracts No. FPA201564969-P, No. FPA2015-65035-P, No. FPA2017-87568-P, and No. RTI2018-098868-B-I00 (MINECO/FEDER, UE), by the Spanish Ministry of Science with Grant No. FPA201783946-C2-1-P (MCIU/AEI/FEDER), by Technology Facilities Council (STFC) of the UK Grant No. ST/R004056/1, by the German BMBF under Contract No. 05P18PKCIA, by the Romanian IFA project CERN-RO/ISOLDE, by the National Science Centre (Poland) Grant No. 2015/18/M/ST2/00523, and by the Academy of Finland (Finland) Grant No. 307685.
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