# Half-life and excitation energy of the $I^{\pi}$=13/2^+ isomer in $^{209}$Ra

Abstract : 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.
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Journal articles

http://hal.in2p3.fr/in2p3-00278858
Contributor : Béatrice Forrler <>
Submitted on : Wednesday, May 14, 2008 - 10:00:11 AM
Last modification on : Tuesday, May 4, 2021 - 11:26:08 AM

### Citation

K. Hauschild, A. Lopez-Martens, A.V. Yeremin, O. Dorvaux, A.V. Belozerov, et al.. Half-life and excitation energy of the $I^{\pi}$=13/2^+ isomer in $^{209}$Ra. Physical Review C, American Physical Society, 2008, 77, pp.047305. ⟨10.1103/PhysRevC.77.047305⟩. ⟨in2p3-00278858⟩

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