N=16 spherical shell closure in O24

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. YonedaZ. H. Li, F. Delaunay, J. Gibelin, F. M. Marqués, N. A. Orr, T. Honda, M. Matsushita, T. Kobayashi, Y. Miyashita, T. Sumikama, K. Yoshinaga, S. Shimoura, D. Sohler, T. Zheng, Z. X. Cao

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Abstract

The unbound excited states of the neutron drip-line isotope O24 have been investigated via the O24(p,p )O23+n reaction in inverse kinematics at a beam energy of 62MeV/nucleon. The decay energy spectrum of O*24 was reconstructed from the momenta of O23 and the neutron. The spin parity of the first excited state, observed at E x=4.65±0. 14MeV, was determined to be Jπ=2 + from the angular distribution of the cross section. Higher-lying states were also observed. The quadrupole transition parameter β 2 of the 21+ state was deduced, for the first time, to be 0.15±0.04. The relatively high excitation energy and small β 2 value are indicative of the N=16 shell closure in O24.

Original languageEnglish
Article number022501
JournalPhysical review letters
Volume109
Issue number2
DOIs
Publication statusPublished - Jul 12 2012

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Tshoo, K., Satou, Y., Bhang, H., Choi, S., Nakamura, T., Kondo, Y., Deguchi, S., Kawada, Y., Kobayashi, N., Nakayama, Y., Tanaka, K. N., Tanaka, N., Aoi, N., Ishihara, M., Motobayashi, T., Otsu, H., Sakurai, H., Takeuchi, S., Togano, Y., ... Cao, Z. X. (2012). N=16 spherical shell closure in O24. Physical review letters, 109(2), [022501]. https://doi.org/10.1103/PhysRevLett.109.022501