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

J. Khuyagbaatar, A. Yakushev, Ch. E. Düllmann, D. Ackermann, L.-L. Andersson, M. Block, H. Brand, D. M. Cox, J. Even, Ulrika Forsberg, Pavel Golubev, W. Hartmann, R.-D. Herzberg, F. P. Heßberger, J. Hoffmann, A. Hübner, E. Jäger, J. Jeppsson, B. Kindler, J. V. KratzJ. Krier, N. Kurz, B. Lommel, M. Maiti, S. Minami, A. K. Mistry, Ch. M. Mrosek, I. Pysmenetska, Dirk Rudolph, Luis Sarmiento, H. Schaffner, M. Schädel, B. Schausten, J. Steiner, T. Torres De Heidenreich, J. Uusitalo, M. Wegrzecki, N. Wiehl, V. Yakusheva

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Sammanfattning

Two short-lived isotopes 221U and 222U were produced as evaporation residues in the fusion reaction 50Ti+176Yb at the gas-filled recoil separator TASCA. An α decay with an energy of Eα=9.31(5)  MeV and half-life T1/2=4.7(7)  μs was attributed to 222U. The new isotope 221U was identified in α-decay chains starting with Eα=9.71(5)  MeV and T1/2=0.66(14)  μs 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 α-decay reduced width.
Originalspråkengelska
Artikelnummer242502
Antal sidor4
TidskriftPhysical Review Letters
Volym115
Nummer24
DOI
StatusPublished - 2015

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  • Low-lying states in 219Ra and 215Rn: Sampling microsecond α-decaying nuclei

    Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, C. E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J. & 28 andra, Gregorich, K. E., Gross, C. J., Herzberg, R. D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, K., Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N. & Yakushev, A., 2018 okt. 9, I: Physical Review C. 98, 4, 11 s., 044307.

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