The first excited state of the most neutron-rich beryllium isotope, 14Be, has been studied by inelastic scattering with a 12C target at 68 MeV / nucleon. The state has been observed at Ex = 1.54 (13) MeV, and its spin-parity has been determined as Jπ = 2+ from the measurement of the angular distribution. This provides a complete set of energies of the first 2+ states in the beryllium isotopic chain. The extracted deformation length of 14Be has been found to be substantially smaller than that of the neighboring nucleus 12Be, in which the N = 8 shell closure is quenched, indicating hindered collectivity in the 14Be nucleus.
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2007 Oct 18|
- Drip-line nucleus
- Shell evolution
ASJC Scopus subject areas
- Nuclear and High Energy Physics