Anomalously hindered E2 strength B(E2;2_1^+ -> 0^+) in 16C

A. Gelberg (University of Koln; A. Saito (Rikkyo University; E. Kaneko; E. Takeshita; Germany) K. Ishikawa; H. Baba; H. Hasegawa; H. Iwasaki; H. Kawasaki; H. Sakurai

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Anomalously hindered E2 strength B(E2;2_1^+ -> 0^+) in 16C

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arxiv nucl-ex/0309022 v1 submitted 2003-09-30 nucl-ex

N. Imai , N. Aoi , N. Fukuda , T. Kishida , T. Kubo , T. Minemura , T. Motobayashi , S. Takeuchi

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K. Yoneda H. Watanabe M. Ishihara (RIKEN Japan) H.J. Ong H. Sakurai H. Iwasaki T.K. Ohnishi M.K. Suzuki (University of Tokyo Japan) K. Demichi H. Kawasaki H. Baba T. Gomi H. Hasegawa E. Kaneko S. Kanno K. Kurita E. Takeshita A. Saito (Rikkyo University Zs. Dombradi Z. Elekes Zs. Fulop (ATOMKI Hungary) A. Gelberg (University of Koln Germany) K. Ishikawa Y. Kondo M. Miura T. Nakamura T. Sugimoto (Tokyo Institute of Technology Japan) S. Michimasa M. Notani S. Shimoura M. Tamaki (CNS University of Tokyo

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The electric quadrupole transition from the first 2+ state to the ground 0+ state in 16C is studied through measurement of the lifetime by a recoil shadow method applied to inelastically scattered radioactive 16C nuclei. The measured lifetime is 75 +- 23 ps, corresponding to a B(E2;2_1+ -> 0^+) value of 0.63 +- 0.19 e2fm4, or 0.26 +- 0.08 Weisskopf units. The transition strength is found to be anomalously small compared to the empirically predicted value.

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