New Short-Lived Isotope U-221 and the Mass Surface Near N=126

J. Khuyagbaatar*, A. Yakushev, Ch. E. Duellmann, D. Ackermann, L. -L. Andersson, M. Block, H. Brand, D. M. Cox, J. Even, U. Forsberg, P. Golubev, W. Hartmann, R. -D. Herzberg, F. P. Hessberger, J. Hoffmann, A. Huebner, E. Jaeger, J. Jeppsson, B. Kindler, J. V. KratzJ. Krier, N. Kurz, B. Lommel, M. Maiti, S. Minami, A. K. Mistry, Ch. M. Mrosek, I. Pysmenetska, D. Rudolph, L. G. Sarmiento, H. Schaffner, M. Schaedel, B. Schausten, J. Steiner, T. Torres De Heidenreich, J. Uusitalo, M. Wegrzecki, N. Wiehl, V. Yakusheva

*Corresponding author voor dit werk

OnderzoeksoutputAcademicpeer review

78 Citaten (Scopus)

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-2English
Artikelnummer242502
Aantal pagina's5
TijdschriftPhysical Review Letters
Volume115
Nummer van het tijdschrift24
DOI's
StatusPublished - 10-dec.-2015
Extern gepubliceerdJa

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