Samenvatting
The superheavy isotope 258Db was produced in the 209Bi(50Ti, 1n)258Db reaction at GSI, Germany. A detailed α -spectroscopy study of this isotope and its α -decay daughter products was performed. Two long-lived α -decaying states in 258Db are observed. A spin-parity of 0− is tentatively assigned to the ground state for which a half-life of 2.17±0.36 s is determined. Spins and parities of either 5+ or 10− are proposed for the isomeric state found at an excitation energy of 51 keV with a half-life of 4.41±0.21 s. The α -decay daughter isotope 254Lr displays a similar behavior. A half-life of 11.9±0.9 s is determined for the 254Lr ground state which is tentatively assigned a spin-parity of 4+ . The isomeric level of this isotope placed at 108 keV with a half-life of 20.3±4.2 s is tentatively assigned a spin-parity of 1− . Two long-lived α -decaying states are observed in the granddaughter isotope 250Md . The ground state has a half-life of 59.5±9.1 s. A half-life of 42.4±4.5 s is measured for the isomeric state positioned at an excitation energy of 123 keV. Partial, tentative level schemes for 254Lr, 250Md and 246Es are proposed based on the α - γ coincidences.
Originele taal-2 | English |
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Artikelnummer | 17 |
Aantal pagina's | 12 |
Tijdschrift | European Physical Journal A |
Volume | 55 |
Nummer van het tijdschrift | 2 |
DOI's | |
Status | Published - feb.-2019 |
Extern gepubliceerd | Ja |