HAL : in2p3-00278858, version 1
 Physical Review C 77 (2008) 047305
 Half-life and excitation energy of the $I^{\pi}$=13/2^+ isomer in $^{209}$Ra
 (2008)
 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Mot(s)-clé(s) : alpha-decay – gamma-ray spectra – ground states – nuclear cascades – nuclear isomerism – nuclei with mass number 190 to 219 – radioactive decay periods
 in2p3-00278858, version 1 http://hal.in2p3.fr/in2p3-00278858 oai:hal.in2p3.fr:in2p3-00278858 Contributeur : Béatrice Forrler <> Déposé pour le compte de : Olivier Dorvaux <> Soumis le : Mercredi 14 Mai 2008, 10:00:11 Dernière modification le : Mercredi 14 Mai 2008, 11:46:52