Abstract
An excited state in the proton-rich unbound nucleus was identified at 1.8(4) MeV via missing-mass spectroscopy with the reaction at . The spin-parity of the state was determined to be or by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in indicates the breakdown of the major shell closure at near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between and its mirror partner .
- Received 2 June 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.152503
©2009 American Physical Society