| The unbound excited states of the most neutron-rich dripline oxygen isotope, 24O, have been investigated by using the 24O(p, p′) 24O * reaction at the beam energy of 62 MeV/nucleon in inverse kinematics. The first and second unbound excited states of 24O have been observed at {Mathematical expression} MeV and {Mathematical expression} MeV (preliminary) along with the evidence for another higher lying state at around 7.3 MeV. The quadrupole deformation parameter {Mathematical expression} was deduced to be {Mathematical expression} (preliminary) for the first time. The systematics of the {Mathematical expression} and the {Mathematical expression} in the Z = 8 isotopes shows the N = 16 spherical shell closure in 24O. |
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