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Séminaire présenté par le Dr. Poenaru, Frankfurt Institute for Advanced Studies

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A strong Decay Mode of Superheavy Nuclei

Par : Dr. D. Poenaru, Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany and Horia Hulubei National Institute for Physics and Nuclear Engineering, Magurele, Romania

Date : mardi 29 novembre 2011 à 11h00
Lieu : IPHC, Salle de Réunion 2e étage du Bâtiment 27

Résumé :

Calculations of half-lives of superheavy nuclei (SH) show an unexpected result : for some of them heavy particle radioactivity (HPR) dominates over alpha decay - the main decay mode of the majority of recently discovered SHs. The result is important for theory and future experiments producing heavier SHs with a substantial amount of funding. The standard identification
technique by alpha decay chains will be impossible for these cases. HPR had been predicted in 1980 (see A parent nucleus produces an emitted particle and a daughter. All measured half-lives on 14C, 20O, 23F, 22,24-26Ne, 28,30Mg, 32,34Si radioactivities are in agreement with predicted values within our analytical super-asymmetric fission model. In the present work we changed the concept of HPR to allow emitted particles with atomic numbers Ze > 28 from parents with Z > 110 and daughter around 208Pb. Calculations for superheavy (SH) nuclei with Z = 104 - 124 are showing a trend toward shorter half-lives and larger branching ratio relative to alpha decay for heavier SHs. A new table of measured masses AME11 and the theoretical KTUY05 and FRDM95 tables are used to determine Q-value - a crucial quantity.

Personne à contacter : Radomira LOZEVA