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The N = 16 spherical shell closure 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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Submitted on : Wednesday, February 6, 2013 - 11:26:06 AM
Last modification on : Tuesday, November 24, 2020 - 11:30:12 AM

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K. Tshoo, Y. Satou, H. Bhang, S. Choi, T. Nakamura, et al.. The N = 16 spherical shell closure in 24O. 5th Asia-Pacific Conference on Few-Body Problems in Physics, Seoul 2011, 2011, Séoul, South Korea. pp.459-463, ⟨10.1007/s00601-012-0413-3⟩. ⟨in2p3-00785481⟩

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