541 articles – 2702 Notices  [english version]
 HAL : in2p3-00024208, version 1
 DOI : 10.1063/1.1905291
 Conference on Nuclei at the Limits, Argonne, Illinois : United States (2004)
 Shape coexistence in light krypton isotopes
 (2005)
 Shape coexistence in the light krypton isotopes was studied in a series of experiments at GANIL using various experimental techniques. A new low-lying $0^+$ state, a so-called shape isomer, was found in delayed conversion-electron spectroscopy after fragmentation reactions. The systematics of such low-lying $0+^$ states suggests that the ground states of the isotopes $^{78}$Kr and $^{76}$Kr have prolate deformation, while states with prolate and oblate shape are practically degenerate and strongly mixed in $^{74}$Kr, and that the oblate configuration becomes the ground state in $^{72}$Kr. This scenario was tested in experiments performing low-energy Coulomb excitation of radioactive $^{76}$Kr and $^{74}$Kr beams from the SPIRAL facility. Both transitional and diagonal electromagnetic matrix elements were extracted from the observed $\gamma$-ray yields. The results find the prolate shape for the ground-state bands in $^{76}$Kr and $^{74}$Kr and an oblate deformation for the excited $2^{+}_{2}$ state in $^{74}$Kr, confirming the proposed scenario of shape coexistence
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Mot(s)-clé(s) : nuclear shape – krypton – nuclei with mass number 59 to 89 – isotopes – nuclear isomerism – deformed nuclei – nuclear fragmentation – electron spectroscopy
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 in2p3-00024208, version 1 http://hal.in2p3.fr/in2p3-00024208 oai:hal.in2p3.fr:in2p3-00024208 Contributeur : Emmanuelle Vernay <> Soumis le : Lundi 8 Janvier 2007, 10:17:39 Dernière modification le : Jeudi 27 Août 2009, 16:01:01