Alpha-decay study of 218U; a search for the sub-shell closure at Z = 92

Authors :: F. P. Heßberger
J. Perkowski
Tuomas Grahn
Sarah Eeckhaudt
P.M. Jones
Rauno Julin
Paul Greenlees
Heikki Kettunen
Pasi Kuusiniemi
T. Enqvist
Panu Rahkila
Sakari Juutinen
Catherine Scholey
Paavo Nieminen
G. Sletten
J. Uusitalo
Ari Pekka Leppänen
M. Leino
Janne Pakarinen
K. Eskola
Source :: The European Physical Journal A. 25:183-184
Publication Year :: 2005
Publisher :: Springer Science and Business Media LLC, 2005.
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+0.17-0.10)ms.