Speaker
Description
Very neutron-rich isotopes, including 28−32Ne, in the vicinity of N = 20 are known to exhibit ground states dominated by fp-shell intruder configurations: the "island of inversion." Systematics for the Ne-isotopic chain suggest that such configurations may be in strong competition with normal shell-model configurations in the ground state of 29Ne. A determination of the structure of 29Ne is thus important to delineate the extent of the island of inversion and better understand structural evolution in neutron-rich Ne isotopes. In order to investigate the structure of 29Ne, we have measured cross sections for one-neutron removal on carbon and lead targets and the parallel momentum distribution of the 28Ne residues from the carbon target at around 240 MeV/nucleon at RIKEN RI Beam Factory. The combined analysis of the carbon and lead cross sections suggests that the ground state of 29Ne has a spin parity of 3/2−. Detailed comparisons of the measured inclusive and partial cross sections of the two targets and the parallel momentum distribution of the carbon target with reaction calculations, combined with spectroscopic information from large-scale shell-model calculations, are all consistent with a 3/2− spin-parity assignment. The results are also well understood in the Nilson diagram. In the presentation, we will discuss our results and recent relevant date.
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| Are you a student or postdoc? | no |
