1. ANOMALOUSLY HINDERED E2 STRENGTHS IN 16,18C.
- Author
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ONG, HOOI JIN, IMAI, NOBUAKI, SUZUKI, DAISUKE, IWASAKI, HIRONORI, ONISHI, TAKEO, SUZUKI, MASARU, NAKAO, TARO, ICHIKAWA, YUICHI, OTA, SHINSUKE, SAKURAI, HIROYOSHI, TAKEUCHI, SATOSHI, AOI, NORI, BABA, HIDETADA, BISHOP, SHAWN, ISHIHARA, MASAYASU, KUBO, TOSHIYUKI, MOTOBAYASHI, TOHRU, YANAGISAWA, YOSHIYUKI, TOGANO, YASUHIRO, and KURITA, KAZUO
- Subjects
ANGULAR correlations (Nuclear physics) ,NUCLEAR reactions ,QUADRUPOLES ,HAMILTONIAN systems ,HARMONIC oscillators - Abstract
Lifetime measurement of the first excited 2
+ state in18 C 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 $B(E2;\;2_1^+ \to 0_{{\rm{gs}}}^+)$ value of 4.3 ± 0.2 ± 1.0 e2 fm4 , or about 1.5 Weisskopf units. The mean lifetime of the first 2+ state in16 C 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 in16,18 C are hindered compared to the empirical transition strengths, indicating that the anomalous hindered E2 strength observed in16 C persists in18 C. [ABSTRACT FROM AUTHOR]- Published
- 2009
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