Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apre10007n&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
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.
Chowdhury Papia
Clark Rebecca
Cline David
Cullen D. M.
Fallon Paul
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