Abstract
Lifetimes of short-lived excited states in a wide range of neutron-rich fission fragments were measured using the recoil distance Doppler shift (RDDS) technique, which was applied to fusion-fission reactions in inverse kinematics for the first time. The fission fragments were identified eventby- event in mass, charge, and atomic number using the VAMOS magnetic spectrometer at GANIL. Gamma rays originating from the fission fragments were measured with the EXOGAM array of Ge Clover detectors around the target position. Using a degrader, the change in the Doppler shift of the $\gamma$ ray allows the application of the RDDS method. Details of the experimental technique will be discussed and the status for the ongoing analysis for odd-mass yttrium isotopes will be presented.
Highlights
In order to further our understanding of nuclear structure, it is essential to acquire experimental observables that can be compared to theoretical (903)predictions
Preliminary results for 99Y indicate that the lifetimes of the states in the [422]5/2+ ground-state band are in good agreement with expectations from the particle-rotor model
In the particle-rotor model, the B(M1) and B(E2) values are proportional to the g-factors2 and to the intrinsic quadrupole moment Q0, respectively
Summary
In order to further our understanding of nuclear structure, it is essential to acquire experimental observables that can be compared to theoretical. A sudden increase of the difference in the mean-square charge radii is observed for the isotopic chains of Rb, Sr, Y, Zr, and Nb isotopes [1, 2] Nuclei in this transitional region, where spherical and deformed configurations cross in energy, exhibit shape coexistence. A similar Coulomb excitation experiment for the 97,99Rb isotopes indicates that the sudden shape transition is present in the Rb chain and that the deformation for Rb nuclei above N = 60 is similar to the other strongly deformed nuclei in the region [6]. The objective of the present experiment was to provide electromagnetic transition rates from lifetime measurements for a wide range of nuclei in this particular region of the nuclear landscape where shape transitions and shape coexistence occur. The analysis of the B(M1) and B(E2) values with the particle-rotor model provides information on the g-factor of the odd proton and the quadrupole moment of the deformed 98Sr core
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