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; Y. Yanagisawa

doi:10.1103/PhysRevC.78.014308

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. MotobayashiT. Nakamura, T. Okumura, Y. Yanagisawa

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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.

Original language	English
Article number	014308
Journal	Physical Review C - Nuclear Physics
Volume	78
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.78.014308
Publication status	Published - Jul 10 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.78.014308

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Ong, H. J., Imai, N., Suzuki, D., Iwasaki, H., Sakurai, H., Onishi, T. K., Suzuki, M. K., Ota, S., Takeuchi, S., Nakao, T., Togano, Y., Kondo, Y., Aoi, N., Baba, H., Bishop, S., Ichikawa, Y., Ishihara, M., Kubo, T., Kurita, K., ... Yanagisawa, Y. (2008). Lifetime measurements of first excited states in C16,18. Physical Review C - Nuclear Physics, 78(1), [014308]. https://doi.org/10.1103/PhysRevC.78.014308

Ong, HJ, Imai, N, Suzuki, D, Iwasaki, H, Sakurai, H, Onishi, TK, Suzuki, MK, Ota, S, Takeuchi, S, Nakao, T, Togano, Y, Kondo, Y, Aoi, N, Baba, H, Bishop, S, Ichikawa, Y, Ishihara, M, Kubo, T, Kurita, K, Motobayashi, T, Nakamura, T, Okumura, T & Yanagisawa, Y 2008, 'Lifetime measurements of first excited states in C16,18', Physical Review C - Nuclear Physics, vol. 78, no. 1, 014308. https://doi.org/10.1103/PhysRevC.78.014308

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title = "Lifetime measurements of first excited states in C16,18",

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.",

author = "Ong, {H. J.} and N. Imai and D. Suzuki and H. Iwasaki and H. Sakurai and Onishi, {T. K.} and Suzuki, {M. K.} and S. Ota and S. Takeuchi and T. Nakao and Y. Togano and Y. Kondo and N. Aoi and H. Baba and S. Bishop and Y. Ichikawa and M. Ishihara and T. Kubo and K. Kurita and T. Motobayashi and T. Nakamura and T. Okumura and Y. Yanagisawa",

year = "2008",

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doi = "10.1103/PhysRevC.78.014308",

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T1 - Lifetime measurements of first excited states in C16,18

AU - Ong, H. J.

AU - Imai, N.

AU - Suzuki, D.

AU - Iwasaki, H.

AU - Sakurai, H.

AU - Onishi, T. K.

AU - Suzuki, M. K.

AU - Ota, S.

AU - Takeuchi, S.

AU - Nakao, T.

AU - Togano, Y.

AU - Kondo, Y.

AU - Aoi, N.

AU - Baba, H.

AU - Bishop, S.

AU - Ichikawa, Y.

AU - Ishihara, M.

AU - Kubo, T.

AU - Kurita, K.

AU - Motobayashi, T.

AU - Nakamura, T.

AU - Okumura, T.

AU - Yanagisawa, Y.

PY - 2008/7/10

Y1 - 2008/7/10

N2 - 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.

AB - 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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Lifetime measurements of first excited states in C16,18

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