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Discovery of the First 2- State in 16C via Neutron Knockout Reaction |
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| Authors: | J W Hwang Y Satou T Nakamura Y Kondo N Matsui Y Hashimoto T Nakabayashi T Okumura M Shinohara N Fukuda T Sugimoto H Otsu Y Togano T Motobayashi H Sakurai Y Yanagisawa N Aoi S Takeuchi T Gomi M Ishihara S Kawai H J Ong T K Onishi S Shimoura M Tamaki T Kobayashi Y Matsuda N Endo M Kitayama |
| Institution: | 1. Department of Physics and Astronomy, Seoul National University, Seoul, South Korea 2. Department of Physics, Tokyo Institute of Technology, Tokyo, Japan 3. The Institute of Physical and Chemical Research (RIKEN), Saitama, Japan 4. Department of Physics, Rikkyo University, Tokyo, Japan 5. Department of Physics, University of Tokyo, Tokyo, Japan 6. Center for Nuclear Study (CNS), University of Tokyo, Saitama, Japan 7. Department of Physics, Tohoku University, Miyagi, Japan |
| Abstract: | The 16C nucleus has been investigated by the neutron knockout reaction of 17C on a liquid hydrogen target. Applying the invariant mass method in inverse kinematics and γ-ray spectroscopy, the energy spectrum was reconstructed by triple-coincidence measurement, in which neutrons, charged fragments, and γ rays from the decay of the reaction residue (16C*) were detected. A peak at 0.47 MeV was observed in the invariant mass spectrum in coincidence with a peak at 0.74 MeV in the γ-ray spectrum, which indicates the presence of an unbound state with an excitation energy of 5.46 MeV. Comparison of the experimental cross section with the value derived by a theoretical calculation provided evidence that the spin-parity of this state is 2?. |
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