The N = 16 spherical shell closure in 24O
K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, Y. Kondo, S., Deguchi, Y. Kawada, N. Kobayashi, Y. Nakayama, K. N. Tanaka, N. Tanaka, N., Aoi, M. Ishihara, T. Motobayashi, H. Otsu, H. Sakurai, S. Takeuchi, Y., Togano, K. Yoneda, Z. H. Li, F. Delaunay, J. Gibelin
TL;DR
This study investigates the excited states of the neutron-rich isotope 24O, providing evidence for the N=16 shell closure through experimental measurements of energy levels, spin-parity, and transition parameters.
Contribution
The paper presents the first measurement of the quadrupole transition parameter beta2 for the 2+ state in 24O, supporting the existence of the N=16 shell closure.
Findings
First determination of the 2+ state energy at 4.65 MeV
Measured beta2 value of 0.15 indicating a shell closure
Observation of higher excited states in 24O
Abstract
The unbound excited states of the neutron drip-line isotope 24O have been investigated via the 24O(p,p')23O+n reaction in inverse kinematics at a beam energy of 62 MeV/nucleon. The decay energy spectrum of 24O* was reconstructed from the momenta of 23O and the neutron. The spin-parity of the first excited state, observed at Ex = 4.65 +/- 0.14 MeV, was determined to be Jpi = 2+ from the angular distribution of the cross section. Higher lying states were also observed. The quadrupole transition parameter beta2 of the 2+ state was deduced, for the first time, to be 0.15 +/- 0.04. The relatively high excitation energy and small beta2 value are indicative of the N = 16 shell closure in 24O.
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