Alpha decay study of <sup>218</sup>U; A search for the sub-shell closure at Z=92
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Leppänen, A. P.
Uusitalo, J.
Eeckhaudt, S.
Enqvist, T.
Eskola, K.
Grahn, T.
Heßberger, F. P.
Greenlees, P. T.
Jones, P.
Julin, R.
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Neutron-deficient uranium isotopes 218U and 219U were studied via α spectroscopic methods. The isotopes were produced in fusion evaporation reaction 182W(40Ar,xn)222-xnU. The ground state decay properties of 218U were measured with improved statistics and in addition a low-lying α decaying isomeric state was discovered. The isomer in 218U decays by α emission with an energy of Eα=10 678(17) keV and with a half-life of T 1/2=(0.56-0.14+0.26)ms. The new isomeric state was assigned spin and parity IΠ = 8+. The ground state α decay has an energy of Eα=8612(9) keV and a half-life of T1/2=(0.51-0.10+0.17)ms. The ground state decay properties of 219U were determined with improved statistics as Eα=9774(18) keV and a half-life of T1/2=(0.08 -0.03+0.10)ms.
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Frontiers in Nuclear Structure, Astrophysics, and Reactions - FINUSTAR
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