The N=16 Spherical Shell Closure in 24O

Tshoo, K. and Satou, Y. and Bhang, H. and Choi, S. and Nakamura, T. and Deguchi, S. and Kawada, Y. and Kondo, Y. and Kobayashi, N. and Nakayama, Y. and Tanaka, K. N. and Tanaka, N. and Aoi, N. and Ishihara, M. and Motobayashi, T. and Otsu, H. and Sakurai, H. and Takeuchi, S. and Togano, Y. and Yoneda, K. and Li, Z. H. and Delaunay, F. and Gibelin, J. and Marques, F. M. and Orr, N. A. and Honda, T. and Matsushita, M. and Kobayashi, T. and Miyashita, Y. and Sumikama, T. and Kunné Sohler, Dorottya (2013) The N=16 Spherical Shell Closure in 24O. FEW-BODY SYSTEMS, 54 (1-4). pp. 459-463. ISSN 0177-7963

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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 Jπ = 2+ from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter β2 of the 2+ 1 state was deduced, for the first time, to be 0.15 ± 0.04. The relatively high excitation energy and small β2 value are indicative of the N=16 shell closure in 24O.

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