Samenvatting
Two short-lived isotopes U-221 and U-222 were produced as evaporation residues in the fusion reaction Ti-50 + Yb-176 at the gas-filled recoil separator TASCA. An alpha decay with an energy of E-alpha = 9.31(5) MeV and half-life T-1/2 = 4.7(7) mu s was attributed to U-222. The new isotope 221U was identified in alpha-decay chains starting with E-alpha = 9.71(5) MeV and T-1/2 = 0.66(14) mu s leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N = 126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of alpha-decay reduced width.
Originele taal-2 | English |
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Artikelnummer | 242502 |
Aantal pagina's | 5 |
Tijdschrift | Physical Review Letters |
Volume | 115 |
Nummer van het tijdschrift | 24 |
DOI's | |
Status | Published - 10-dec.-2015 |
Extern gepubliceerd | Ja |