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Physical Review C 77 (2008) 047305
Half-life and excitation energy of the $I^{\pi}$=13/2^+ isomer in $^{209}$Ra
K. Hauschild1, A. Lopez-Martens1, A.V. Yeremin, O. Dorvaux2, A.V. Belozerov, M.L. Chelnokov, V.I. Chepigin, B. Gall2, V.A. Gorshkov, M. Guttormsen, P. Jones, A.P. Kabachenko, A. Khouaja2, A.C. Larsen, O.N. Malyshev, A. Minkova, H.T. Nyhus, Yu.Ts. Oganessian, D. Pantelica, A.G. Popeko, F. Rotaru, S. Saro, A.V. Shutov, S. Siem, A.I. Svirikhin, N.U.H. Syed

An isomeric state in $^{209}$Ra has been observed for the first time, using the GABRIELA setup at the focal plane of VASSILISSA, to decay to the ground state of $^{209}$Ra via a cascade of 238-keV (M2) and 644-keV transitions. The half-life of the isomer has been measured to be 117(5) $\mu$s and from systematics is assigned as a neutron i ^{-1}_{13/2} excitation.
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  DRS-IPHC - Département Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale
alpha-decay – gamma-ray spectra – ground states – nuclear cascades – nuclear isomerism – nuclei with mass number 190 to 219 – radioactive decay periods