Discovery of the First 2- State in 16C via Neutron Knockout Reaction

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

doi:10.1007/s00601-012-0585-x

Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction

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. IshiharaS. Kawai, H. J. Ong, T. K. Onishi, S. Shimoura, M. Tamaki, T. Kobayashi, Y. Matsuda, N. Endo, M. Kitayama

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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^-.

Original language	English
Pages (from-to)	1469-1472
Number of pages	4
Journal	Few-Body Systems
Volume	54
Issue number	7-10
DOIs	https://doi.org/10.1007/s00601-012-0585-x
Publication status	Published - 2013 Aug

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1007/s00601-012-0585-x

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Hwang, J. W., Satou, Y., Nakamura, T., Kondo, Y., Matsui, N., Hashimoto, Y., Nakabayashi, T., Okumura, T., Shinohara, M., Fukuda, N., Sugimoto, T., Otsu, H., Togano, Y., Motobayashi, T., Sakurai, H., Yanagisawa, Y., Aoi, N., Takeuchi, S., Gomi, T., ... Kitayama, M. (2013). Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction. Few-Body Systems, 54(7-10), 1469-1472. https://doi.org/10.1007/s00601-012-0585-x

Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction. / Hwang, J. W.; Satou, Y.; Nakamura, T.; Kondo, Y.; Matsui, N.; Hashimoto, Y.; Nakabayashi, T.; Okumura, T.; Shinohara, M.; Fukuda, N.; Sugimoto, T.; Otsu, H.; Togano, Y.; Motobayashi, T.; Sakurai, H.; Yanagisawa, Y.; Aoi, N.; Takeuchi, S.; Gomi, T.; Ishihara, M.; Kawai, S.; Ong, H. J.; Onishi, T. K.; Shimoura, S.; Tamaki, M.; Kobayashi, T.; Matsuda, Y.; Endo, N.; Kitayama, M.

In: Few-Body Systems, Vol. 54, No. 7-10, 08.2013, p. 1469-1472.

Research output: Contribution to journal › Article › peer-review

Hwang, JW, Satou, Y, Nakamura, T, Kondo, Y, Matsui, N, Hashimoto, Y, Nakabayashi, T, Okumura, T, Shinohara, M, Fukuda, N, Sugimoto, T, Otsu, H, Togano, Y, Motobayashi, T, Sakurai, H, Yanagisawa, Y, Aoi, N, Takeuchi, S, Gomi, T, Ishihara, M, Kawai, S, Ong, HJ, Onishi, TK, Shimoura, S, Tamaki, M, Kobayashi, T, Matsuda, Y, Endo, N & Kitayama, M 2013, 'Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction', Few-Body Systems, vol. 54, no. 7-10, pp. 1469-1472. https://doi.org/10.1007/s00601-012-0585-x

Hwang, J. W. ; Satou, Y. ; Nakamura, T. ; Kondo, Y. ; Matsui, N. ; Hashimoto, Y. ; Nakabayashi, T. ; Okumura, T. ; Shinohara, M. ; Fukuda, N. ; Sugimoto, T. ; Otsu, H. ; Togano, Y. ; Motobayashi, T. ; Sakurai, H. ; Yanagisawa, Y. ; Aoi, N. ; Takeuchi, S. ; Gomi, T. ; Ishihara, M. ; Kawai, S. ; Ong, H. J. ; Onishi, T. K. ; Shimoura, S. ; Tamaki, M. ; Kobayashi, T. ; Matsuda, Y. ; Endo, N. ; Kitayama, M. / Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction. In: Few-Body Systems. 2013 ; Vol. 54, No. 7-10. pp. 1469-1472.

@article{9795ba690c93477aa3f19433c6501b1f,

title = "Discovery of the First 2- State in 16C via Neutron Knockout Reaction",

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-.",

author = "Hwang, {J. W.} and Y. Satou and T. Nakamura and Y. Kondo and N. Matsui and Y. Hashimoto and T. Nakabayashi and T. Okumura and M. Shinohara and N. Fukuda and T. Sugimoto and H. Otsu and Y. Togano and T. Motobayashi and H. Sakurai and Y. Yanagisawa and N. Aoi and S. Takeuchi and T. Gomi and M. Ishihara and S. Kawai and Ong, {H. J.} and Onishi, {T. K.} and S. Shimoura and M. Tamaki and T. Kobayashi and Y. Matsuda and N. Endo and M. Kitayama",

note = "Funding Information: This work was in part supported by the NRF grant (Nos. R32-2008-000-10155-0(WCU), 2010-0027136) of MEST Korea.",

year = "2013",

month = aug,

doi = "10.1007/s00601-012-0585-x",

language = "English",

volume = "54",

pages = "1469--1472",

journal = "Few-Body Systems",

issn = "0177-7963",

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AU - Hwang, J. W.

AU - Satou, Y.

AU - Nakamura, T.

AU - Kondo, Y.

AU - Matsui, N.

AU - Hashimoto, Y.

AU - Nakabayashi, T.

AU - Okumura, T.

AU - Shinohara, M.

AU - Fukuda, N.

AU - Sugimoto, T.

AU - Otsu, H.

AU - Togano, Y.

AU - Motobayashi, T.

AU - Sakurai, H.

AU - Yanagisawa, Y.

AU - Aoi, N.

AU - Takeuchi, S.

AU - Gomi, T.

AU - Ishihara, M.

AU - Kawai, S.

AU - Ong, H. J.

AU - Onishi, T. K.

AU - Shimoura, S.

AU - Tamaki, M.

AU - Kobayashi, T.

AU - Matsuda, Y.

AU - Endo, N.

AU - Kitayama, M.

N1 - Funding Information: This work was in part supported by the NRF grant (Nos. R32-2008-000-10155-0(WCU), 2010-0027136) of MEST Korea.

PY - 2013/8

Y1 - 2013/8

N2 - 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-.

AB - 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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JF - Few-Body Systems

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Discovery of the First 2^- State in ¹⁶C via Neutron Knockout Reaction

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