g-Factors Near the First Backbend in 82Sr and 84Sr
The field strength B TF depends on the instantaneous velocity of the ion and is therefore a function of time. The limits t i and t o are the entry and exit times of the ferromagnetic foil and τ is the mean lifetime of the nuclear state. The application of the TF technique to states near the backbend of deformed nuclei has been hampered by the relatively long times taken to populate these levels by the γ-ray cascade following heavy-ion reactions; in the rare-earth and mass-130 regions the side-feeding times to discrete yrast states are comparable to the stopping time of the ions and at which time the transient field disappears. Such difficulties seem to be greatly reduced in the mass-80 region; a number of experiments using recoil-distance and Doppler-shift attenuation methods [1,2] find rather fast side-feeding times of the order of 0.1 ps to states near the first backbend (E x ≈ 4 MeV), particularly when the excited nucleus is formed at low spin. It should therefore be possible to measure g-factors of these states in a TF experiment. In the present work we have applied the TF technique to states in the transitional nuclei 82Sr and 84Sr which exhibit backbending around spin 8+ due to alignment of either proton or neutron g 9/2 quasiparticles.
KeywordsDouble Ratio Iron Foil Negative Parity State Transient Field Nuclear Precession
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- A Dewald, U Kaup, W Gast, A Gelberg, K O Zell and von Brentano, Proc. 4th Int. Conf. Nucl. Far from Stability, Helsingør, ed. L O Skolen (CERN 81-09 ) p. 418.Google Scholar