Lifetime measurements of first excited states in C16,18

H. J. Ong, N. Imai, D. Suzuki, H. Iwasaki, H. Sakurai, T. K. Onishi, M. K. Suzuki, S. Ota, S. Takeuchi, T. Nakao, Y. Togano, Y. Kondo, N. Aoi, H. Baba, S. Bishop, Y. Ichikawa, M. Ishihara, T. Kubo, K. Kurita, T. Motobayashi, T. Nakamura, T. Okumura, and Y. Yanagisawa
Phys. Rev. C 78, 014308 – Published 10 July 2008

Abstract

The electric quadrupole transition from the first 2+ state to the ground 0+ state in C18 was studied through a lifetime measurement by an upgraded recoil shadow method applied to inelastically scattered radioactive C18 nuclei. The measured mean lifetime is 18.9±0.9(stat)±4.4(syst) ps, corresponding to a B(E2;21+0g.s.+) value of 4.3±0.2±1.0e2 fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in C16 was remeasured to be 18.3±1.4±4.8 ps, about four times shorter than the value reported previously. The discrepancy between the two results was explained by incorporating the γ-ray angular distribution measured in this work into the previous measurement. These transition strengths are hindered compared to the empirical transition strengths, indicating that the anomalous hindrance observed in C16 persists in C18.

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  • Received 26 November 2007

DOI:https://doi.org/10.1103/PhysRevC.78.014308

©2008 American Physical Society

Authors & Affiliations

H. J. Ong1,2,*, N. Imai2,†, D. Suzuki1, H. Iwasaki1,‡, H. Sakurai1,§, T. K. Onishi1, M. K. Suzuki1, S. Ota3, S. Takeuchi2, T. Nakao1, Y. Togano4, Y. Kondo5,§, N. Aoi2, H. Baba2, S. Bishop2, Y. Ichikawa1, M. Ishihara2, T. Kubo2, K. Kurita4, T. Motobayashi2, T. Nakamura5, T. Okumura5, and Y. Yanagisawa2

  • 1Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan
  • 2RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
  • 3Center for Nuclear Study, University of Tokyo, RIKEN campus, Hirosawa 2-1, Wako, Saitama 351-0198, Japan
  • 4Department of Physics, Rikkyo University, Nishi-Ikebukuro 3-34-1, Toshima, Tokyo 171-8501, Japan
  • 5Department of Physics, Tokyo Institute of Technology, Ookayama 2-12-1, Meguro, Tokyo 152-8551, Japan

  • *onghjin@ribf.riken.jp; Present address: RCNP, Osaka University, Mihogaoka 10-1, Ibaraki, Osaka 567-0047, Japan.
  • Present address: KEK, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan.
  • Present address: Institut für Kernphysik, Universität zu Köln, Köln, Germany.
  • §Present address: RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

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Vol. 78, Iss. 1 — July 2008

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