Published in
EDP Sciences, The European Physical Journal A, S1(25), p. 183-184
DOI: 10.1140/epjad/i2005-06-116-y
The 4th International Conference on Exotic Nuclei and Atomic Masses, p. 183-184
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Alpha-decay study of 218U; a search for the sub-shell closure at Z = 92
,
R. Julin,
S. Juutinen,
H. Kettunen,
P. Kuusiniemi,
M. Leino,
P. Nieminen
and other authors.
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Abstract
Neutron-deficient uranium isotopes were studied via α spectroscopic methods. A low-lying α-decaying isomeric state was found in ²¹⁸U. The new isomeric state was assigned spin and parity Iπ=8⁺. The isomer decays by α emission with an energy E = 10678(17)keV and with a half-life T1/2 = (0.56⁺⁰·²⁶-₀.₁₄)ms. The known alpha-decay properties of the ground state of ²¹⁸U was measured with improved statistics. The ground-state α-decay has an energy E = 8612(9)keV and a half-life T1/2 = (0.51⁺⁰·¹⁷ˍ₀.₁₀)ms.