Prompt Spectroscopy of Neutron-rich ^180,181,182Hf Nuclei

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Our continuing investigations in the A ~180 region have resulted in significant new information on long-lived K-isomers (t_1/2>=1μs) in neutron-rich hafnium nuclei. The present study focuses on short-lived isomers and prompt structures. The nuclei were populated via inelastic and transfer reactions using a 750 MeV ^136Xe beam from the LBNL 88" cyclotron incident on a 410 μg/cm^2 ^180Hf target backed by 40 μg/cm^2 carbon. The emitted γ-rays were detected with GAMMASPHERE in conjunction with CHICO, which can distinguish between beam-like and target-like fragments, and reconstruct the particle kinematics. This allows event-by-event Doppler corrections for the fast rotational transitions emitted by nuclei recoiling out of the target. Rotational structures have been extended to J^π=18^+, 37/2^- and 14^+ for the ground state bands of ^180,181,182Hf respectively. Other low- and high-K structures have also been extended by several units of spin. Systematics of prompt rotational structures in this region will be discussed.

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