Lifetime Measurements Using RDDS Method in the Vicinity of $^{78}$Ni
Résumé
Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich N = 52 isotones 88Kr and 86Se were investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was performed at GANIL (Caen, France) using the Orsay Universal Plunger System (OUPS) for the RDDS technique and the AGATA array for the γ-ray detection coupled to the VAMOS++ magnetic spectrometer for an event-by-event particle identification. In 88Kr, the lifetimes of seven levels were determined and in 86Se, the lifetimes of five levels were determined. The deduced B(E2; 2+ 1 → 0 + 1 ) are compared with mean-field and shellmodel calculations.
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