par Lopez-Martens, A.;Hauschild, Klaus;Yeremin, Alexander;Belozerov, Alexey;Briançon, Ch;Chelnokov, Maxim;Chepigin, Victor;Curien, Dominique;Dorvaux, O.;Gall, B. P J;Gorshkov, V.A.;Guttormsen, Magne;Hanappe, Francis 
;Kabachenko, A.P.;Khalfallah, F.;Korichi, Ahmed;Larsen, André;Malyshev, Oleg;Minkova, Ani;Oganessian, Yu.Ts.;Popeko, Andrei;Rousseau, Marc;Rowley, Neil;Sagaidak, Roman;Sharo, S.;Shutov, Alexander;Siem, Sunniva;Svirikhin, Alexander;Syed, Naeem Ul Hasan;Theisen, Ch
Référence Physical review. C. Nuclear physics, 74, 4, 044303
Publication Publié, 2006
;Kabachenko, A.P.;Khalfallah, F.;Korichi, Ahmed;Larsen, André;Malyshev, Oleg;Minkova, Ani;Oganessian, Yu.Ts.;Popeko, Andrei;Rousseau, Marc;Rowley, Neil;Sagaidak, Roman;Sharo, S.;Shutov, Alexander;Siem, Sunniva;Svirikhin, Alexander;Syed, Naeem Ul Hasan;Theisen, ChRéférence Physical review. C. Nuclear physics, 74, 4, 044303
Publication Publié, 2006
Article révisé par les pairs
| Résumé : | Excited states in Fm249 were populated via the α decay of No253 and the subsequent decay was observed with the GABRIELA detection system installed at the focal plane of the VASSILISSA recoil separator. The energies, spins, and parities of these states could be established through combined α,γ, and conversion-electron spectroscopy. The first members of the ground-state rotational band were identified. Their excitation energies as well as the observation of a cross-over E2 transition confirm the assignment of 7/2+[624] for the ground state of Fm249. Two excited states were also observed and their decay properties suggest that they correspond to the particle excitation 9/2-[734] and hole excitation 5/2+[622]. The analysis suggests that the 279-keV transition de-exciting the 9/2- state has anomalous E1 conversion coefficients. © 2006 The American Physical Society. |
