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Exploring the “island of inversion” by in-beam γ-ray spectroscopy of the neutron-rich sodium isotopes Na31,32,33

P. Doornenbal, H. Scheit, N. Kobayashi, N. Aoi (青井考), S. Takeuchi (武内聡), K. Li (李闊昂), E. Takeshita (竹下英里), Y. Togano (栂野泰宏), H. Wang, S. Deguchi, Y. Kawada, Y. Kondo (近藤洋介), T. Motobayashi (本林透), T. Nakamura (中村隆司), Y. Satou, K. N. Tanaka, and H. Sakurai (櫻井博儀)
Phys. Rev. C 81, 041305(R) – Published 28 April 2010

Abstract

The structure of the neutron-rich sodium isotopes Na31,32,33 was investigated by means of in-beam γ-ray spectroscopy following one-neutron knockout and inelastic scattering of radioactive beams provided by the RIKEN Radioactive Ion Beam Factory. The secondary beams were selected and separated by the fragment separator BigRIPS and incident at 240 MeV/nucleon on a natural carbon (secondary) target, which was surrounded by the DALI2 array to detect coincident de-excitation γ rays. Scattered particles were identified by the spectrometer ZeroDegree. In Na31, a new decay γ ray was observed in coincidence with the known (5/21+)3/2g.s.(+) transition, while for Na32,33 excited states are reported for the first time. From a comparison to state-of-the-art shell-model calculations it is concluded that the newly observed excited state in Na31 belongs to a rotational band formed by a 2p2h intruder configuration within the “Island of Inversion.”

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  • Received 15 March 2010

DOI:https://doi.org/10.1103/PhysRevC.81.041305

©2010 American Physical Society

Authors & Affiliations

P. Doornenbal1,*, H. Scheit1,2, N. Kobayashi3, N. Aoi (青井考)1, S. Takeuchi (武内聡)1, K. Li (李闊昂)1,2, E. Takeshita (竹下英里)1, Y. Togano (栂野泰宏)1, H. Wang1,2, S. Deguchi3, Y. Kawada3, Y. Kondo (近藤洋介)1, T. Motobayashi (本林透)1, T. Nakamura (中村隆司)3, Y. Satou3, K. N. Tanaka3, and H. Sakurai (櫻井博儀)1

  • 1RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
  • 2Peking University, Beijing 100871, People's Republic of China
  • 3Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan

  • *pieter@ribf.riken.jp

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Issue

Vol. 81, Iss. 4 — April 2010

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