Abstract
The 1.9-s isomeric state () in was directly populated in the (,5) reaction. Alpha and spontaneous fission (SF) decays of , as well as the 68-s state , was investigated with a rotating wheel apparatus under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. An identification of was based on - correlations linking decays of and its daughter . The -particle energy of was measured to be 8.52 ± 0.05 MeV. The half-life was determined to be 1.9 ± 0.4 s based on both 8.52-MeV and SF decays. The and SF branches are 0.27 ± 0.06 and 0.73 ± 0.06, respectively. The cross section for the (,5) reaction is σ() = 11 ± 2 nb at 95.1 MeV, which gives a cross-section ratio of σ()/σ() = 1.1 ± 0.2.
- Received 25 September 2010
DOI:https://doi.org/10.1103/PhysRevC.83.034602
©2011 American Physical Society