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 Kurita; Yosuke Kondo; Takashi Nakamura; Toshifumi Okumura

doi:10.1142/S0217751X09045753

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 journal › Article › peer-review

Abstract

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⁺→ 0_gs⁺ 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 language	English
Pages (from-to)	2168-2174
Number of pages	7
Journal	International Journal of Modern Physics A
Volume	24
Issue number	11
DOIs	https://doi.org/10.1142/S0217751X09045753
Publication status	Published - Apr 30 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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Ong, H. J., Imai, N., Suzuki, D., Iwasaki, H., Onishi, T., Suzuki, M., Nakao, T., Ichikawa, Y., Ota, S., Sakurai, H., Takeuchi, S., Aoi, N., Baba, H., Bishop, S., Ishihara, M., Kubo, T., Motobayashi, T., Yanagisawa, Y., Togano, Y., ... Okumura, T. (2009). Anomalously hindered E2 strengths in ^16,18C. International Journal of Modern Physics A, 24(11), 2168-2174. https://doi.org/10.1142/S0217751X09045753

Ong, HJ, Imai, N, Suzuki, D, Iwasaki, H, Onishi, T, Suzuki, M, Nakao, T, Ichikawa, Y, Ota, S, Sakurai, H, Takeuchi, S, Aoi, N, Baba, H, Bishop, S, Ishihara, M, Kubo, T, Motobayashi, T, Yanagisawa, Y, Togano, Y, Kurita, K, Kondo, Y, Nakamura, T & Okumura, T 2009, 'Anomalously hindered E2 strengths in ^16,18C', International Journal of Modern Physics A, vol. 24, no. 11, pp. 2168-2174. https://doi.org/10.1142/S0217751X09045753

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title = "Anomalously hindered E2 strengths in 16,18C",

abstract = "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.",

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

note = "Funding Information: The authors thank the RIKEN Ring Cyclotron staff for the stable 22Ne beam throughout the experiment. This work is supported in part by Grant-in-Aid for Scientific Research No. 15204017 and 20740163 from the Ministry of Education, Culture, Sports, Science and Technology of Japan.",

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doi = "10.1142/S0217751X09045753",

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AU - Ong, Hooi Jin

AU - Imai, Nobuaki

AU - Suzuki, Daisuke

AU - Iwasaki, Hironori

AU - Onishi, Takeo

AU - Suzuki, Masaru

AU - Nakao, Taro

AU - Ichikawa, Yuichi

AU - Ota, Shinsuke

AU - Sakurai, Hiroyoshi

AU - Takeuchi, Satoshi

AU - Aoi, Nori

AU - Baba, Hidetada

AU - Bishop, Shawn

AU - Ishihara, Masayasu

AU - Kubo, Toshiyuki

AU - Motobayashi, Tohru

AU - Yanagisawa, Yoshiyuki

AU - Togano, Yasuhiro

AU - Kurita, Kazuo

AU - Kondo, Yosuke

AU - Nakamura, Takashi

AU - Okumura, Toshifumi

N1 - Funding Information: The authors thank the RIKEN Ring Cyclotron staff for the stable 22Ne beam throughout the experiment. This work is supported in part by Grant-in-Aid for Scientific Research No. 15204017 and 20740163 from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

PY - 2009/4/30

Y1 - 2009/4/30

N2 - 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.

AB - 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.

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Anomalously hindered E2 strengths in ^16,18C

Abstract

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