Low-lying intruder state of the unbound nucleus 13Be

Y. Kondo, T. Nakamura, Y. Satou, T. Matsumoto, N. Aoi, N. Endo, N. Fukuda, T. Gomi, Y. Hashimoto, M. Ishihara, S. Kawai, M. Kitayama, T. Kobayashi, Y. Matsuda, N. Matsui, T. Motobayashi, T. Nakabayashi, T. Okumura, H. J. Ong, T. K. OnishiK. Ogata, H. Otsu, H. Sakurai, S. Shimoura, M. Shinohara, T. Sugimoto, S. Takeuchi, M. Tamaki, Y. Togano, Y. Yanagisawa

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72 Citations (Scopus)


An experimental study for the unbound nucleus 13Be has been performed by means of the invariant mass method via the one-neutron removal reaction 1H (14Be, 12Be + n). A resonance has been observed at 0.51(1) MeV in the relative energy (Erel) spectrum of the 12Be + n system. The transverse momentum distribution of the 12Be + n system as well as the resonance width of 0.45(3) MeV gives evidence for the p-wave nature of the resonance. A d-wave resonance has also been observed at 2.39(5) MeV in the Erel spectrum. The observation of the low-lying p-wave resonance indicates the disappearance of the N = 8 magicity in the vicinity of the neutron drip line region.

Original languageEnglish
Pages (from-to)245-249
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3
Publication statusPublished - Jun 21 2010

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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