Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2010-03-15
Phys.Rev.C81:041305,2010
Physics
Nuclear Physics
Nuclear Experiment
Accepted for Publication in Phys. Rev. C, 11 pages, 6 figures
Scientific paper
10.1103/PhysRevC.81.041305
The structure of the neutron rich sodium isotopes 31,32,33Na was investigated by means of in-beam gammaray spectroscopy following one-neutron knockout and inelastic scattering of radioactive beams provided by the RIKEN Radioactive Ion Beam Factory. The secondary beams were selected and separated by the fragment separator BigRIPS and incident at ~240 meV/u on a natural carbon (secondary) target, which was surrounded by the DALI2 array to detect coincident de-excitation gammarays. Scattered particles were identified by the spectrometer ZeroDegree. In 31Na, a new decay gammaray was observed in coincidence with the known (5/2+)-> 3/2(+) transition, while for 32,33Na excited states are reported for the first time. From a comparison to state-of-the-art shell model calculations it is concluded that the newly observed excited state in 31Na belongs to a rotational band formed by a 2p2h intruder configuration within the "Island of Inversion".
Aoi N.
Deguchi Shigeki
Doornenbal P.
Kawada Yoshifumi
Kobayashi Nami
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