In-beam gamma-ray spectroscopy of F and Ne isotopes near the island of inversion

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Kunibiki Messe (Matsue)

Kunibiki Messe


Oral contribution Session 16


Mr Masahiro Yasuda (Tokyo Tech)


It is known that neutron magic number N=20 disappears in the region of Z=10~12. Study of nuclei in this region, called "island of inversion" is important for understanding the evolution of shell structure in neutron-rich region. Neutron-rich F and Ne isotopes are located at the south boundary of the island of inversion. Due to the difficulty in production of these extremely neutron-rich nuclei, available experimental data are not sufficient.

We performed in-beam gamma-ray spectroscopy of the neutron-rich 29F,
28-30Ne generated by inelastic scattering and single-nucleon removal reactions on a liquid hydrogen target at the RIKEN RI Beam Factory. 29F, 29,30Ne secondary beams were generated by projectile fragmentation of a 48Ca primary beam on a beryllium target at a beam energy of 345 MeV/u. High statistical data was obtained by using MINOS, which consists of 15 cm thick liquid-hydrogen target and recoil-proton tracking detector. Outgoing particles were identified by SAMURAI spectrometer. The de-excitation gamma rays were measured with the NaI(Tl) scintillator array DALI2 arranged to surround the target.

We studied high-lying excited states and gamma-gamma coincidences for decay from the populated nuclei. In case of nucleon-removal reactions of 29,30Ne, partial cross sections have also been investigated. In this presentation, we discuss the nuclear structure of these nuclei based on the experimental results.

Primary author

Mr Masahiro Yasuda (Tokyo Tech)

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