NEW STRUCTURES IN (HF)-H-178 AND COULOMB EXCITATION OF ISOMERS

作者：Hayes A B^*; Cline D; Wu C Y; Hurst A M; Carpenter M P; Greene J P; Janssens R V F; Lauritsen T; Seweryniak D; Zhu S; Karamian S A; Walker P M; Swan T P D; Rigby S V; Cullen D M; Lumley N M; Mason P; Carroll J J; Detwiler B; Harle T; Mills I; Trees G

来源：International Journal of Modern Physics E-Nuclear Physics, 2011, 20(2): 474-481.

DOI：10.1142/S0218301311017879

A 985 MeV Hf-178 beam was Coulomb excited by a Pb-208 target at the ATLAS accelerator of Argonne National Laboratory. Gammasphere and the CHICO particle detector recorded particle-gamma coincidence data. The aim was to populate and determine the mechanism of previously observed Coulomb excitation of the K-pi = 6(+) (t(1/2) = 77 us),8(-) (4 s) and 16(+) (31 y) isomer bands. New rotational bands were identified including an aligned band which appears to mix with the ground-state band (GSB) and the gamma-vibrational band above similar to 12 h of angular momentum. Newly observed gamma-decay transitions into the three isomer bands may elucidate the K-mixing which allows Coulomb excitation of these isomer bands, but direct decays from the GSB into the 16(+) isomer band have not yet been confirmed.

• 出版日期2011-2