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

K. Hauschild; A. Lopez-Martens; A.V. Yeremin; O. Dorvaux; A.V. Belozerov; M.L. Chelnokov; V.I. Chepigin; B. Gall; V.A. Gorshkov; M. Guttormsen; P. Jones; A.P. Kabachenko; A. Khouaja; 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

HAL : in2p3-00278858, version 1

DOI : 10.1103/PhysRevC.77.047305

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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

(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.

1 :	CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse

2 :	DRS-IPHC - Département Recherches Subatomiques

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


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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