Abstract
The spectroscopy of has been investigated using a radioactive beam and the (,) reaction in inverse kinematics. The ground and first excited states have been determined to be and , respectively. Two neutron unbound states were observed at excitation energies of 4.77(10) and 6.17(11) MeV. The spectroscopic factor deduced for the lower of these, interpreted as a 3/ level, reveals a relatively pure () single-particle configuration, in good agreement with shell-model calculations that predict to be unbound. The large energy difference between the and states is indicative of the emergence of the shell gap, which is estimated to be 5.1(11) MeV. For the higher-lying resonance, which has a character consistent with a spin-parity assignment of or , a 0.71(22) branching ratio to the first state in has been observed.
- Received 5 April 2011
- Publisher error corrected 28 July 2011
DOI:https://doi.org/10.1103/PhysRevC.84.011301
©2011 American Physical Society
Corrections
28 July 2011