Anomalously hindered E2 strengths in 16,18C

Hooi Jin Ong, Nobuaki Imai, Daisuke Suzuki, Hironori Iwasaki, Takeo Onishi, Masaru Suzuki, Taro Nakao, Yuichi Ichikawa, Shinsuke Ota, Hiroyoshi Sakurai, Satoshi Takeuchi, Nori Aoi, Hidetada Baba, Shawn Bishop, Masayasu Ishihara, Toshiyuki Kubo, Tohru Motobayashi, Yoshiyuki Yanagisawa, Yasuhiro Togano, Kazuo KuritaYosuke Kondo, Takashi Nakamura, Toshifumi Okumura

Research output: Contribution to journalArticlepeer-review


Lifetime measurement of the first excited 2+ state in 18C was performed using an upgraded recoil shadow method to determine the electric quadrupole transition. The measured mean lifetime is 18.9 ± 0.9 (stat) ± 4.4 (syst) ps, which corresponds to a B(E2;2 1+→ 0gs+ value of 4.3 ± 0.2 ± 1.0 e2fm4, or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in 16C was remeasured to be about 18 ps, about four times shorter than the value reported previously. By incorporating the γ-ray angular distribution measured in this work into the previous measurement, this discrepancy has been explained. The observed transition strengths in 16,18C are hindered compared to the empirical transition strengths, indicating that the anomalous hindered E2 strength observed in 16C persists in 18C.

Original languageEnglish
Pages (from-to)2168-2174
Number of pages7
JournalInternational Journal of Modern Physics A
Issue number11
Publication statusPublished - Apr 30 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics


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